diff --git a/mayan/apps/acls/apps.py b/mayan/apps/acls/apps.py
index a35278d1c1..e774138c14 100644
--- a/mayan/apps/acls/apps.py
+++ b/mayan/apps/acls/apps.py
@@ -20,7 +20,7 @@ class ACLsApp(MayanAppConfig):
     def ready(self):
         super(ACLsApp, self).ready()
 
-        AccessControlList = self.get_model('AccessControlList')
+        AccessControlList = self.get_model(model_name='AccessControlList')
 
         SourceColumn(
             attribute='role', is_sortable=True, source=AccessControlList,
diff --git a/mayan/apps/acls/classes.py b/mayan/apps/acls/classes.py
index 4aba2f9b59..d7ffae9b28 100644
--- a/mayan/apps/acls/classes.py
+++ b/mayan/apps/acls/classes.py
@@ -8,9 +8,9 @@ logger = logging.getLogger(__name__)
 
 
 class ModelPermission(object):
-    _registry = {}
-    _proxies = {}
     _inheritances = {}
+    _proxies = {}
+    _registry = {}
 
     @classmethod
     def register(cls, model, permissions):
@@ -36,7 +36,7 @@ class ModelPermission(object):
 
         if as_content_type:
             content_type_dictionary = ContentType.objects.get_for_models(
-                *cls._registry.keys()
+                models=cls._registry.keys()
             )
             content_type_ids = [
                 content_type.pk for content_type in content_type_dictionary.values()
diff --git a/mayan/apps/acls/models.py b/mayan/apps/acls/models.py
index a39886d279..1c6939c32e 100644
--- a/mayan/apps/acls/models.py
+++ b/mayan/apps/acls/models.py
@@ -71,5 +71,5 @@ class AccessControlList(models.Model):
 
     def get_inherited_permissions(self):
         return AccessControlList.objects.get_inherited_permissions(
-            role=self.role, obj=self.content_object
+            obj=self.content_object, role=self.role
         )
diff --git a/mayan/apps/acls/permissions.py b/mayan/apps/acls/permissions.py
index ada2ec8c36..cd4bd07446 100644
--- a/mayan/apps/acls/permissions.py
+++ b/mayan/apps/acls/permissions.py
@@ -4,11 +4,11 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.permissions import PermissionNamespace
 
-namespace = PermissionNamespace(name='acls', label=_('Access control lists'))
+namespace = PermissionNamespace(label=_('Access control lists'), name='acls')
 
 permission_acl_edit = namespace.add_permission(
-    name='acl_edit', label=_('Edit ACLs')
+    label=_('Edit ACLs'), name='acl_edit'
 )
 permission_acl_view = namespace.add_permission(
-    name='acl_view', label=_('View ACLs')
+    label=_('View ACLs'), name='acl_view'
 )
diff --git a/mayan/apps/acls/views.py b/mayan/apps/acls/views.py
index 69e1133ed0..aa6025f335 100644
--- a/mayan/apps/acls/views.py
+++ b/mayan/apps/acls/views.py
@@ -46,8 +46,8 @@ class ACLCreateView(SingleObjectCreateView):
             raise Http404
 
         AccessControlList.objects.check_access(
-            permissions=permission_acl_edit, user=request.user,
-            obj=self.content_object
+            obj=self.content_object, permissions=permission_acl_edit,
+            user=request.user
         )
 
         return super(ACLCreateView, self).dispatch(request, *args, **kwargs)
@@ -88,8 +88,8 @@ class ACLDeleteView(SingleObjectDeleteView):
         acl = get_object_or_404(klass=AccessControlList, pk=self.kwargs['pk'])
 
         AccessControlList.objects.check_access(
-            permissions=permission_acl_edit, user=request.user,
-            obj=acl.content_object
+            obj=acl.content_object, permissions=permission_acl_edit,
+            user=request.user
         )
 
         return super(ACLDeleteView, self).dispatch(request, *args, **kwargs)
@@ -126,8 +126,8 @@ class ACLListView(SingleObjectListView):
             raise Http404
 
         AccessControlList.objects.check_access(
-            permissions=permission_acl_view, user=request.user,
-            obj=self.content_object
+            obj=self.content_object, permissions=permission_acl_view,
+            user=request.user
         )
 
         return super(ACLListView, self).dispatch(request, *args, **kwargs)
diff --git a/mayan/apps/appearance/settings.py b/mayan/apps/appearance/settings.py
index 5a53ef6719..5b93d43525 100644
--- a/mayan/apps/appearance/settings.py
+++ b/mayan/apps/appearance/settings.py
@@ -6,7 +6,8 @@ from mayan.apps.smart_settings import Namespace
 
 from .literals import DEFAULT_MAXIMUM_TITLE_LENGTH
 
-namespace = Namespace(name='appearance', label=_('Appearance'))
+namespace = Namespace(label=_('Appearance'), name='appearance')
+
 setting_max_title_length = namespace.add_setting(
     default=DEFAULT_MAXIMUM_TITLE_LENGTH,
     global_name='APPEARANCE_MAXIMUM_TITLE_LENGTH', help_text=_(
diff --git a/mayan/apps/appearance/templates/appearance/base.html b/mayan/apps/appearance/templates/appearance/base.html
index 7df87700c8..2a0c0a5362 100644
--- a/mayan/apps/appearance/templates/appearance/base.html
+++ b/mayan/apps/appearance/templates/appearance/base.html
@@ -25,8 +25,8 @@
     <div class="">
         <div class="row no-gutters">
             <div class="col-xs-12">
-                {% check_sqlite as check_sqlite %}
-                {% if check_sqlite %}
+                {% common_check_sqlite as check_sqlite %}
+                {% if common_check_sqlite %}
                     <div class="alert alert-dismissible alert-warning">
                         <button type="button" class="close" data-dismiss="alert">&times;</button>
                         <p><strong>{% trans 'Warning' %}</strong> {{ check_sqlite }}</p>
diff --git a/mayan/apps/appearance/templatetags/appearance_tags.py b/mayan/apps/appearance/templatetags/appearance_tags.py
index d51fd040c8..05c3ba043d 100644
--- a/mayan/apps/appearance/templatetags/appearance_tags.py
+++ b/mayan/apps/appearance/templatetags/appearance_tags.py
@@ -24,4 +24,4 @@ def get_form_media_js(form):
 
 @register.simple_tag
 def get_icon(icon_path):
-    return import_string(icon_path).render()
+    return import_string(dotted_path=icon_path).render()
diff --git a/mayan/apps/authentication/forms.py b/mayan/apps/authentication/forms.py
index ebc7e5233d..c7c0663148 100644
--- a/mayan/apps/authentication/forms.py
+++ b/mayan/apps/authentication/forms.py
@@ -56,8 +56,10 @@ class EmailAuthenticationForm(forms.Form):
         return self.cleaned_data
 
     def check_for_test_cookie(self):
-        warnings.warn('check_for_test_cookie is deprecated; ensure your login '
-                      'view is CSRF-protected.', DeprecationWarning)
+        warnings.warn(
+            'check_for_test_cookie is deprecated; ensure your login '
+            'view is CSRF-protected.', DeprecationWarning
+        )
 
     def get_user_id(self):
         if self.user_cache:
diff --git a/mayan/apps/authentication/settings.py b/mayan/apps/authentication/settings.py
index f0b7c0f409..e15f2f083b 100644
--- a/mayan/apps/authentication/settings.py
+++ b/mayan/apps/authentication/settings.py
@@ -6,7 +6,7 @@ from mayan.apps.smart_settings import Namespace
 
 from .literals import DEFAULT_LOGIN_METHOD, DEFAULT_MAXIMUM_SESSION_LENGTH
 
-namespace = Namespace(name='authentication', label=_('Authentication'))
+namespace = Namespace(label=_('Authentication'), name='authentication')
 setting_login_method = namespace.add_setting(
     global_name='AUTHENTICATION_LOGIN_METHOD', default=DEFAULT_LOGIN_METHOD,
     help_text=_(
diff --git a/mayan/apps/cabinets/apps.py b/mayan/apps/cabinets/apps.py
index 32c8f8fc84..bb28d4a238 100644
--- a/mayan/apps/cabinets/apps.py
+++ b/mayan/apps/cabinets/apps.py
@@ -48,8 +48,8 @@ class CabinetsApp(MayanAppConfig):
             app_label='documents', model_name='Document'
         )
 
-        DocumentCabinet = self.get_model('DocumentCabinet')
-        Cabinet = self.get_model('Cabinet')
+        DocumentCabinet = self.get_model(model_name='DocumentCabinet')
+        Cabinet = self.get_model(model_name='Cabinet')
 
         # Add explicit order_by as DocumentCabinet ordering Meta option has no
         # effect.
diff --git a/mayan/apps/cabinets/events.py b/mayan/apps/cabinets/events.py
index bca867bd2a..998ceddabd 100644
--- a/mayan/apps/cabinets/events.py
+++ b/mayan/apps/cabinets/events.py
@@ -4,7 +4,7 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.events import EventTypeNamespace
 
-namespace = EventTypeNamespace(name='cabinets', label=_('Cabinets'))
+namespace = EventTypeNamespace(label=_('Cabinets'), name='cabinets')
 
 event_cabinets_add_document = namespace.add_event_type(
     label=_('Document added to cabinet'), name='add_document'
diff --git a/mayan/apps/cabinets/permissions.py b/mayan/apps/cabinets/permissions.py
index f2a2636479..e712a63da5 100644
--- a/mayan/apps/cabinets/permissions.py
+++ b/mayan/apps/cabinets/permissions.py
@@ -4,25 +4,25 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.permissions import PermissionNamespace
 
-namespace = PermissionNamespace(name='cabinets', label=_('Cabinets'))
+namespace = PermissionNamespace(label=_('Cabinets'), name='cabinets')
 
 # Translators: this refers to the permission that will allow users to add
 # documents to cabinets.
 permission_cabinet_add_document = namespace.add_permission(
-    name='cabinet_add_document', label=_('Add documents to cabinets')
+    label=_('Add documents to cabinets'), name='cabinet_add_document'
 )
 permission_cabinet_create = namespace.add_permission(
-    name='cabinet_create', label=_('Create cabinets')
+    label=_('Create cabinets'), name='cabinet_create'
 )
 permission_cabinet_delete = namespace.add_permission(
-    name='cabinet_delete', label=_('Delete cabinets')
+    label=_('Delete cabinets'), name='cabinet_delete'
 )
 permission_cabinet_edit = namespace.add_permission(
-    name='cabinet_edit', label=_('Edit cabinets')
+    label=_('Edit cabinets'), name='cabinet_edit'
 )
 permission_cabinet_remove_document = namespace.add_permission(
-    name='cabinet_remove_document', label=_('Remove documents from cabinets')
+    label=_('Remove documents from cabinets'), name='cabinet_remove_document'
 )
 permission_cabinet_view = namespace.add_permission(
-    name='cabinet_view', label=_('View cabinets')
+    label=_('View cabinets'), name='cabinet_view'
 )
diff --git a/mayan/apps/cabinets/search.py b/mayan/apps/cabinets/search.py
index 24107d6f69..ed1194341c 100644
--- a/mayan/apps/cabinets/search.py
+++ b/mayan/apps/cabinets/search.py
@@ -9,7 +9,7 @@ from .permissions import permission_cabinet_view
 cabinet_search = SearchModel(
     app_label='cabinets', model_name='Cabinet',
     permission=permission_cabinet_view,
-    serializer_string='mayan.apps.cabinets.serializers.CabinetSerializer'
+    serializer_path='mayan.apps.cabinets.serializers.CabinetSerializer'
 )
 
 cabinet_search.add_model_field(
diff --git a/mayan/apps/cabinets/tests/test_api.py b/mayan/apps/cabinets/tests/test_api.py
index 102ad11f7d..643fa31d98 100644
--- a/mayan/apps/cabinets/tests/test_api.py
+++ b/mayan/apps/cabinets/tests/test_api.py
@@ -41,9 +41,7 @@ class CabinetAPITestCase(CabinetTestMixin, BaseAPITestCase):
         response = self._request_cabinet_create_api_view()
 
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
-
         cabinet = Cabinet.objects.first()
-
         self.assertEqual(response.data['id'], cabinet.pk)
         self.assertEqual(response.data['label'], TEST_CABINET_LABEL)
 
@@ -300,7 +298,8 @@ class CabinetDocumentAPITestCase(CabinetTestMixin, DocumentTestMixin, BaseAPITes
         self.assertEqual(response.status_code, status.HTTP_200_OK)
 
         self.assertEqual(
-            response.data['results'][0]['uuid'], force_text(self.test_document.uuid)
+            response.data['results'][0]['uuid'],
+            force_text(self.test_document.uuid)
         )
 
     def test_cabinet_add_document_api_view(self):
diff --git a/mayan/apps/cabinets/tests/test_views.py b/mayan/apps/cabinets/tests/test_views.py
index 2a32fec145..27ef31208b 100644
--- a/mayan/apps/cabinets/tests/test_views.py
+++ b/mayan/apps/cabinets/tests/test_views.py
@@ -127,7 +127,9 @@ class CabinetDocumentViewTestCase(CabinetTestMixin, GenericDocumentViewTestCase)
     def test_cabinet_add_document_view_with_access(self):
         self._create_test_cabinet()
 
-        self.grant_access(obj=self.test_cabinet, permission=permission_cabinet_view)
+        self.grant_access(
+            obj=self.test_cabinet, permission=permission_cabinet_view
+        )
         self.grant_access(
             obj=self.test_cabinet, permission=permission_cabinet_add_document
         )
@@ -147,7 +149,8 @@ class CabinetDocumentViewTestCase(CabinetTestMixin, GenericDocumentViewTestCase)
     def _request_add_multiple_documents_to_cabinet(self):
         return self.post(
             viewname='cabinets:document_multiple_cabinet_add', data={
-                'id_list': (self.test_document.pk,), 'cabinets': self.test_cabinet.pk
+                'id_list': (self.test_document.pk,),
+                'cabinets': self.test_cabinet.pk
             }
         )
 
@@ -211,10 +214,12 @@ class CabinetDocumentViewTestCase(CabinetTestMixin, GenericDocumentViewTestCase)
         self.test_cabinet.documents.add(self.test_document)
 
         self.grant_access(
-            obj=self.test_cabinet, permission=permission_cabinet_remove_document
+            obj=self.test_cabinet,
+            permission=permission_cabinet_remove_document
         )
         self.grant_access(
-            obj=self.test_document, permission=permission_cabinet_remove_document
+            obj=self.test_document,
+            permission=permission_cabinet_remove_document
         )
 
         response = self._request_remove_document_from_cabinet()
@@ -236,7 +241,9 @@ class CabinetDocumentViewTestCase(CabinetTestMixin, GenericDocumentViewTestCase)
 
     def test_cabinet_list_view_with_access(self):
         self._create_test_cabinet()
-        self.grant_access(obj=self.test_cabinet, permission=permission_cabinet_view)
+        self.grant_access(
+            obj=self.test_cabinet, permission=permission_cabinet_view
+        )
 
         response = self._request_cabinet_list()
         self.assertContains(
diff --git a/mayan/apps/cabinets/tests/test_wizard_steps.py b/mayan/apps/cabinets/tests/test_wizard_steps.py
index 058579f1d9..f03298813a 100644
--- a/mayan/apps/cabinets/tests/test_wizard_steps.py
+++ b/mayan/apps/cabinets/tests/test_wizard_steps.py
@@ -45,12 +45,14 @@ class CabinetDocumentUploadTestCase(CabinetTestMixin, GenericDocumentViewTestCas
     def test_upload_interactive_view_with_access(self):
         self._create_test_cabinet()
         self.grant_access(
-            permission=permission_document_create, obj=self.document_type
+            obj=self.document_type, permission=permission_document_create
         )
         response = self._request_upload_interactive_document_create_view()
 
         self.assertEqual(response.status_code, 302)
-        self.assertTrue(self.test_cabinet in Document.objects.first().cabinets.all())
+        self.assertTrue(
+            self.test_cabinet in Document.objects.first().cabinets.all()
+        )
 
     def _request_wizard_view(self):
         return self.get(viewname='sources:document_create_multiple')
@@ -64,5 +66,6 @@ class CabinetDocumentUploadTestCase(CabinetTestMixin, GenericDocumentViewTestCas
             permission=permission_document_create, obj=self.document_type
 
         )
+
         response = self._request_wizard_view()
         self.assertEqual(response.status_code, 200)
diff --git a/mayan/apps/cabinets/views.py b/mayan/apps/cabinets/views.py
index 135c8c8ebb..8c199bfb67 100644
--- a/mayan/apps/cabinets/views.py
+++ b/mayan/apps/cabinets/views.py
@@ -36,7 +36,7 @@ logger = logging.getLogger(__name__)
 class CabinetCreateView(SingleObjectCreateView):
     fields = ('label',)
     model = Cabinet
-    post_action_redirect = reverse_lazy('cabinets:cabinet_list')
+    post_action_redirect = reverse_lazy(viewname='cabinets:cabinet_list')
     view_permission = permission_cabinet_create
 
     def get_extra_context(self):
@@ -57,14 +57,14 @@ class CabinetChildAddView(SingleObjectCreateView):
         self.object.parent = self.get_object()
         self.object.save()
 
-        return super(CabinetChildAddView, self).form_valid(form)
+        return super(CabinetChildAddView, self).form_valid(form=form)
 
     def get_object(self, *args, **kwargs):
         cabinet = super(CabinetChildAddView, self).get_object(*args, **kwargs)
 
         AccessControlList.objects.check_access(
-            permissions=permission_cabinet_edit, user=self.request.user,
-            obj=cabinet.get_root()
+            obj=cabinet.get_root(), permissions=permission_cabinet_edit,
+            user=self.request.user
         )
 
         return cabinet
@@ -81,7 +81,7 @@ class CabinetChildAddView(SingleObjectCreateView):
 class CabinetDeleteView(SingleObjectDeleteView):
     model = Cabinet
     object_permission = permission_cabinet_delete
-    post_action_redirect = reverse_lazy('cabinets:cabinet_list')
+    post_action_redirect = reverse_lazy(viewname='cabinets:cabinet_list')
 
     def get_extra_context(self):
         return {
@@ -95,8 +95,8 @@ class CabinetDetailView(DocumentListView):
 
     def get_document_queryset(self):
         queryset = AccessControlList.objects.filter_by_access(
-            permission=permission_document_view, user=self.request.user,
-            queryset=self.get_object().documents.all()
+            permission=permission_document_view,
+            queryset=self.get_object().documents.all(), user=self.request.user
         )
 
         return queryset
@@ -142,8 +142,8 @@ class CabinetDetailView(DocumentListView):
             permission_object = cabinet.get_root()
 
         AccessControlList.objects.check_access(
-            permissions=permission_cabinet_view, user=self.request.user,
-            obj=permission_object
+            obj=permission_object, permissions=permission_cabinet_view,
+            user=self.request.user
         )
 
         return cabinet
@@ -153,7 +153,7 @@ class CabinetEditView(SingleObjectEditView):
     fields = ('label',)
     model = Cabinet
     object_permission = permission_cabinet_edit
-    post_action_redirect = reverse_lazy('cabinets:cabinet_list')
+    post_action_redirect = reverse_lazy(viewname='cabinets:cabinet_list')
 
     def get_extra_context(self):
         return {
@@ -193,8 +193,8 @@ class DocumentCabinetListView(CabinetListView):
         self.document = get_object_or_404(klass=Document, pk=self.kwargs['pk'])
 
         AccessControlList.objects.check_access(
-            permissions=permission_document_view, user=request.user,
-            obj=self.document
+            obj=self.document, permissions=permission_document_view,
+            user=request.user
         )
 
         return super(DocumentCabinetListView, self).dispatch(
diff --git a/mayan/apps/cabinets/widgets.py b/mayan/apps/cabinets/widgets.py
index 166789dc74..da4ee6d594 100644
--- a/mayan/apps/cabinets/widgets.py
+++ b/mayan/apps/cabinets/widgets.py
@@ -43,7 +43,8 @@ def widget_document_cabinets(document, user):
     )
 
     cabinets = AccessControlList.objects.filter_by_access(
-        permission_cabinet_view, user, queryset=document.document_cabinets()
+        permission_cabinet_view, queryset=document.document_cabinets(),
+        user=user
     )
 
     return format_html_join(
diff --git a/mayan/apps/checkouts/api_views.py b/mayan/apps/checkouts/api_views.py
index 4fba58e77b..ada9aa493d 100644
--- a/mayan/apps/checkouts/api_views.py
+++ b/mayan/apps/checkouts/api_views.py
@@ -57,12 +57,13 @@ class APICheckedoutDocumentView(generics.RetrieveDestroyAPIView):
     def get_queryset(self):
         if self.request.method == 'GET':
             filtered_documents = AccessControlList.objects.filter_by_access(
-                permission=permission_document_view, user=self.request.user,
-                queryset=DocumentCheckout.objects.checked_out_documents()
+                permission=permission_document_view,
+                queryset=DocumentCheckout.objects.checked_out_documents(),
+                user=self.request.user
             )
             filtered_documents = AccessControlList.objects.filter_by_access(
-                permission=permission_document_check_out_detail_view, user=self.request.user,
-                queryset=filtered_documents
+                permission=permission_document_check_out_detail_view,
+                queryset=filtered_documents, user=self.request.user
             )
 
             return DocumentCheckout.objects.filter(
@@ -78,13 +79,13 @@ class APICheckedoutDocumentView(generics.RetrieveDestroyAPIView):
 
         if document.checkout_info().user == request.user:
             AccessControlList.objects.check_access(
-                permissions=permission_document_check_in, user=request.user,
-                obj=document
+                obj=document, permissions=permission_document_check_in,
+                user=request.user
             )
         else:
             AccessControlList.objects.check_access(
-                permissions=permission_document_check_in_override,
-                user=request.user, obj=document
+                obj=document, permissions=permission_document_check_in_override,
+                user=request.user
             )
 
         return super(
diff --git a/mayan/apps/checkouts/apps.py b/mayan/apps/checkouts/apps.py
index 6c82248b3d..4966803dfc 100644
--- a/mayan/apps/checkouts/apps.py
+++ b/mayan/apps/checkouts/apps.py
@@ -20,7 +20,7 @@ from .events import (
     event_document_auto_check_in, event_document_check_in,
     event_document_check_out, event_document_forceful_check_in
 )
-from .handlers import check_new_version_creation
+from .handlers import handler_check_new_version_creation
 from .links import (
     link_check_in_document, link_check_out_document, link_check_out_info,
     link_check_out_list
@@ -114,7 +114,9 @@ class CheckoutsApp(MayanAppConfig):
             widget=DashboardWidgetTotalCheckouts, order=-1
         )
 
-        menu_facet.bind_links(links=(link_check_out_info,), sources=(Document,))
+        menu_facet.bind_links(
+            links=(link_check_out_info,), sources=(Document,)
+        )
         menu_main.bind_links(links=(link_check_out_list,), position=98)
         menu_secondary.bind_links(
             links=(link_check_out_document, link_check_in_document),
@@ -125,7 +127,7 @@ class CheckoutsApp(MayanAppConfig):
         )
 
         pre_save.connect(
-            check_new_version_creation,
-            dispatch_uid='check_new_version_creation',
+            dispatch_uid='checkouts_handler_check_new_version_creation',
+            receiver=handler_check_new_version_creation,
             sender=DocumentVersion
         )
diff --git a/mayan/apps/checkouts/dashboard_widgets.py b/mayan/apps/checkouts/dashboard_widgets.py
index 0d8dc9de99..b1f0b8cf85 100644
--- a/mayan/apps/checkouts/dashboard_widgets.py
+++ b/mayan/apps/checkouts/dashboard_widgets.py
@@ -14,7 +14,7 @@ from .permissions import permission_document_check_out_detail_view
 class DashboardWidgetTotalCheckouts(DashboardWidgetNumeric):
     icon_class = icon_dashboard_check_outs
     label = _('Checked out documents')
-    link = reverse_lazy('checkouts:check_out_list')
+    link = reverse_lazy(viewname='checkouts:check_out_list')
 
     def render(self, request):
         AccessControlList = apps.get_model(
diff --git a/mayan/apps/checkouts/events.py b/mayan/apps/checkouts/events.py
index 69036d2a29..aad73d1fbb 100644
--- a/mayan/apps/checkouts/events.py
+++ b/mayan/apps/checkouts/events.py
@@ -4,19 +4,19 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.events import EventTypeNamespace
 
-namespace = EventTypeNamespace(name='checkouts', label=_('Checkouts'))
+namespace = EventTypeNamespace(label=_('Checkouts'), name='checkouts')
 
 event_document_auto_check_in = namespace.add_event_type(
-    name='document_auto_check_in',
-    label=_('Document automatically checked in')
+    label=_('Document automatically checked in'),
+    name='document_auto_check_in'
 )
 event_document_check_in = namespace.add_event_type(
-    name='document_check_in', label=_('Document checked in')
+    label=_('Document checked in'), name='document_check_in'
 )
 event_document_check_out = namespace.add_event_type(
-    name='document_check_out', label=_('Document checked out')
+    label=_('Document checked out'), name='document_check_out'
 )
 event_document_forceful_check_in = namespace.add_event_type(
-    name='document_forceful_check_in',
-    label=_('Document forcefully checked in')
+    label=_('Document forcefully checked in'),
+    name='document_forceful_check_in'
 )
diff --git a/mayan/apps/checkouts/handlers.py b/mayan/apps/checkouts/handlers.py
index e304eb58be..1916d2d828 100644
--- a/mayan/apps/checkouts/handlers.py
+++ b/mayan/apps/checkouts/handlers.py
@@ -5,7 +5,7 @@ from django.apps import apps
 from .exceptions import NewDocumentVersionNotAllowed
 
 
-def check_new_version_creation(sender, instance, **kwargs):
+def handler_check_new_version_creation(sender, instance, **kwargs):
     """
     Make sure that new version creation is allowed for this document
     """
diff --git a/mayan/apps/checkouts/models.py b/mayan/apps/checkouts/models.py
index dba9f398b8..bfc551c06a 100644
--- a/mayan/apps/checkouts/models.py
+++ b/mayan/apps/checkouts/models.py
@@ -66,11 +66,15 @@ class DocumentCheckout(models.Model):
 
     def delete(self, *args, **kwargs):
         # TODO: enclose in transaction
-        NewVersionBlock.objects.unblock(self.document)
+        NewVersionBlock.objects.unblock(document=self.document)
         super(DocumentCheckout, self).delete(*args, **kwargs)
 
     def get_absolute_url(self):
-        return reverse('checkout:checkout_info', args=(self.document.pk,))
+        return reverse(
+            viewname='checkout:checkout_info', kwargs={
+                'pk': self.document.pk
+            }
+        )
 
     def natural_key(self):
         return self.document.natural_key()
diff --git a/mayan/apps/checkouts/permissions.py b/mayan/apps/checkouts/permissions.py
index 0eb24c4b41..8ea7610a0d 100644
--- a/mayan/apps/checkouts/permissions.py
+++ b/mayan/apps/checkouts/permissions.py
@@ -4,17 +4,17 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.permissions import PermissionNamespace
 
-namespace = PermissionNamespace(name='checkouts', label=_('Document checkout'))
+namespace = PermissionNamespace(label=_('Document checkout'), name='checkouts')
 
 permission_document_check_in = namespace.add_permission(
-    name='checkin_document', label=_('Check in documents')
+    label=_('Check in documents'), name='checkin_document'
 )
 permission_document_check_in_override = namespace.add_permission(
-    name='checkin_document_override', label=_('Forcefully check in documents')
+    label=_('Forcefully check in documents'), name='checkin_document_override'
 )
 permission_document_check_out = namespace.add_permission(
-    name='checkout_document', label=_('Check out documents')
+    label=_('Check out documents'), name='checkout_document'
 )
 permission_document_check_out_detail_view = namespace.add_permission(
-    name='checkout_detail_view', label=_('Check out details view')
+    label=_('Check out details view'), name='checkout_detail_view'
 )
diff --git a/mayan/apps/checkouts/queues.py b/mayan/apps/checkouts/queues.py
index 3792211019..9ef477bdc8 100644
--- a/mayan/apps/checkouts/queues.py
+++ b/mayan/apps/checkouts/queues.py
@@ -5,9 +5,9 @@ from django.utils.translation import ugettext_lazy as _
 from mayan.apps.task_manager.classes import CeleryQueue
 
 queue_checkouts_periodic = CeleryQueue(
-    name='checkouts_periodic', label=_('Checkouts periodic'), transient=True
+    label=_('Checkouts periodic'), name='checkouts_periodic', transient=True
 )
 queue_checkouts_periodic.add_task_type(
-    name='mayan.apps.task_check_expired_check_outs',
-    label=_('Check expired checkouts')
+    label=_('Check expired checkouts'),
+    name='mayan.apps.task_check_expired_check_outs'
 )
diff --git a/mayan/apps/checkouts/serializers.py b/mayan/apps/checkouts/serializers.py
index f0760b1ed5..c3ef6145c5 100644
--- a/mayan/apps/checkouts/serializers.py
+++ b/mayan/apps/checkouts/serializers.py
@@ -42,8 +42,8 @@ class NewDocumentCheckoutSerializer(serializers.ModelSerializer):
         document = Document.objects.get(pk=validated_data.pop('document_pk'))
 
         AccessControlList.objects.check_access(
-            permissions=permission_document_check_out,
-            user=self.context['request'].user, obj=document
+            obj=document, permissions=permission_document_check_out,
+            user=self.context['request'].user
         )
 
         validated_data['document'] = document
diff --git a/mayan/apps/checkouts/tasks.py b/mayan/apps/checkouts/tasks.py
index 68f17b4865..ea7a844d75 100644
--- a/mayan/apps/checkouts/tasks.py
+++ b/mayan/apps/checkouts/tasks.py
@@ -19,7 +19,7 @@ def task_check_expired_check_outs():
         app_label='checkouts', model_name='DocumentCheckout'
     )
 
-    logger.debug('executing...')
+    logger.debug(msg='executing...')
     lock_id = 'task_expired_check_outs'
     try:
         logger.debug('trying to acquire lock: %s', lock_id)
@@ -30,4 +30,4 @@ def task_check_expired_check_outs():
         DocumentCheckout.objects.check_in_expired_check_outs()
         lock.release()
     except LockError:
-        logger.debug('unable to obtain lock')
+        logger.debug(msg='unable to obtain lock')
diff --git a/mayan/apps/checkouts/tests/mixins.py b/mayan/apps/checkouts/tests/mixins.py
index e73b941d12..fa8d601a4b 100644
--- a/mayan/apps/checkouts/tests/mixins.py
+++ b/mayan/apps/checkouts/tests/mixins.py
@@ -19,7 +19,7 @@ class DocumentCheckoutTestMixin(object):
         )
 
         self.test_check_out = DocumentCheckout.objects.check_out_document(
-            document=self.test_document,
+            block_new_version=True, document=self.test_document,
             expiration_datetime=self._check_out_expiration_datetime,
-            block_new_version=True, user=user
+            user=user
         )
diff --git a/mayan/apps/checkouts/tests/test_models.py b/mayan/apps/checkouts/tests/test_models.py
index 4186a98fb6..cd2ea0202f 100644
--- a/mayan/apps/checkouts/tests/test_models.py
+++ b/mayan/apps/checkouts/tests/test_models.py
@@ -16,8 +16,6 @@ from .mixins import DocumentCheckoutTestMixin
 
 
 class DocumentCheckoutTestCase(DocumentCheckoutTestMixin, GenericDocumentTestCase):
-    # auto
-
     def test_document_check_out(self):
         self._check_out_test_document()
 
diff --git a/mayan/apps/checkouts/views.py b/mayan/apps/checkouts/views.py
index 2f33f8cfa7..723b6187a3 100644
--- a/mayan/apps/checkouts/views.py
+++ b/mayan/apps/checkouts/views.py
@@ -31,8 +31,8 @@ class CheckoutDocumentView(SingleObjectCreateView):
         self.document = get_object_or_404(klass=Document, pk=self.kwargs['pk'])
 
         AccessControlList.objects.check_access(
-            permissions=permission_document_check_out, user=request.user,
-            obj=self.document
+            obj=self.document, permissions=permission_document_check_out,
+            user=request.user
         )
 
         return super(
@@ -57,7 +57,7 @@ class CheckoutDocumentView(SingleObjectCreateView):
                 ) % self.document, request=self.request
             )
 
-        return HttpResponseRedirect(self.get_success_url())
+        return HttpResponseRedirect(redirect_to=self.get_success_url())
 
     def get_extra_context(self):
         return {
@@ -77,8 +77,8 @@ class CheckoutListView(DocumentListView):
     def get_document_queryset(self):
         return AccessControlList.objects.filter_by_access(
             permission=permission_document_check_out_detail_view,
-            user=self.request.user,
-            queryset=DocumentCheckout.objects.checked_out_documents()
+            queryset=DocumentCheckout.objects.checked_out_documents(),
+            user=self.request.user
         )
 
     def get_extra_context(self):
@@ -168,13 +168,14 @@ class DocumentCheckinView(ConfirmView):
 
         if document.get_check_out_info().user == self.request.user:
             AccessControlList.objects.check_access(
-                permissions=permission_document_check_in,
-                user=self.request.user, obj=document
+                obj=document, permissions=permission_document_check_in,
+                user=self.request.user
             )
         else:
             AccessControlList.objects.check_access(
+                obj=document,
                 permissions=permission_document_check_in_override,
-                user=self.request.user, obj=document
+                user=self.request.user
             )
 
         try:
diff --git a/mayan/apps/common/apps.py b/mayan/apps/common/apps.py
index c6bc65f084..72acab10ad 100644
--- a/mayan/apps/common/apps.py
+++ b/mayan/apps/common/apps.py
@@ -22,7 +22,7 @@ from mayan.celery import app
 from .classes import Template
 from .handlers import (
     handler_pre_initial_setup, handler_pre_upgrade,
-    user_locale_profile_session_config, user_locale_profile_create
+    handler_user_locale_profile_session_config, handler_user_locale_profile_create
 )
 from .links import (
     link_about, link_check_version, link_current_user_locale_profile_edit,
@@ -94,7 +94,8 @@ class CommonApp(MayanAppConfig):
         super(CommonApp, self).ready()
         if check_for_sqlite():
             warnings.warn(
-                category=DatabaseWarning, message=force_text(MESSAGE_SQLITE_WARNING)
+                category=DatabaseWarning,
+                message=force_text(MESSAGE_SQLITE_WARNING)
             )
 
         Template(
@@ -153,22 +154,22 @@ class CommonApp(MayanAppConfig):
         )
 
         post_save.connect(
-            user_locale_profile_create,
-            dispatch_uid='user_locale_profile_create',
+            dispatch_uid='common_handler_user_locale_profile_create',
+            receiver=handler_user_locale_profile_create,
             sender=settings.AUTH_USER_MODEL
         )
         pre_initial_setup.connect(
-            handler_pre_initial_setup,
-            dispatch_uid='common_handler_pre_initial_setup'
+            dispatch_uid='common_handler_pre_initial_setup',
+            receiver=handler_pre_initial_setup
         )
         pre_upgrade.connect(
-            handler_pre_upgrade,
             dispatch_uid='common_handler_pre_upgrade',
+            receiver=handler_pre_upgrade
         )
 
         user_logged_in.connect(
-            user_locale_profile_session_config,
-            dispatch_uid='user_locale_profile_session_config'
+            dispatch_uid='common_handler_user_locale_profile_session_config',
+            receiver=handler_user_locale_profile_session_config
         )
         self.setup_auto_logging()
 
diff --git a/mayan/apps/common/classes.py b/mayan/apps/common/classes.py
index 8a957de734..9c5564fd66 100644
--- a/mayan/apps/common/classes.py
+++ b/mayan/apps/common/classes.py
@@ -35,6 +35,13 @@ class Collection(object):
     def __str__(self):
         return force_text(self.label)
 
+    def _get_children(self):
+        if self._queryset:
+            return self._queryset
+        else:
+            if self._model:
+                return self._model.objects.all()
+
     def resolve(self):
         self.children = self._get_children()
         self.icon = self._icon
@@ -45,13 +52,6 @@ class Collection(object):
             self.url = reverse(viewname=self._link.view, args=self._link.args)
         return ''
 
-    def _get_children(self):
-        if self._queryset:
-            return self._queryset
-        else:
-            if self._model:
-                return self._model.objects.all()
-
 
 @python_2_unicode_compatible
 class ErrorLogNamespace(object):
@@ -62,9 +62,6 @@ class ErrorLogNamespace(object):
     def __str__(self):
         return force_text(self.label)
 
-    def create(self, obj, result):
-        obj.error_logs.create(namespace=self.name, result=result)
-
     def all(self):
         ErrorLogEntry = apps.get_model(
             app_label='common', model_name='ErrorLogEntry'
@@ -72,6 +69,9 @@ class ErrorLogNamespace(object):
 
         return ErrorLogEntry.objects.filter(namespace=self.name)
 
+    def create(self, obj, result):
+        obj.error_logs.create(namespace=self.name, result=result)
+
 
 class MissingItem(object):
     _registry = []
@@ -92,6 +92,12 @@ class MissingItem(object):
 class ModelAttribute(object):
     _registry = {}
 
+    @classmethod
+    def get_choices_for(cls, model):
+        return [
+            (attribute.name, attribute) for attribute in cls.get_for(model=model)
+        ]
+
     @classmethod
     def get_for(cls, model):
         try:
@@ -106,12 +112,6 @@ class ModelAttribute(object):
 
             return cls.get_for(model=type(model))
 
-    @classmethod
-    def get_choices_for(cls, model):
-        return [
-            (attribute.name, attribute) for attribute in cls.get_for(model)
-        ]
-
     @classmethod
     def get_help_text_for(cls, model, show_name=False):
         result = []
@@ -208,15 +208,6 @@ class ModelField(ModelAttribute):
 class ModelProperty(object):
     _registry = []
 
-    @classmethod
-    def get_for(cls, model):
-        result = []
-
-        for klass in cls._registry:
-            result.extend(klass.get_for(model=model))
-
-        return result
-
     @classmethod
     def get_choices_for(cls, model):
         result = []
@@ -226,6 +217,15 @@ class ModelProperty(object):
 
         return result
 
+    @classmethod
+    def get_for(cls, model):
+        result = []
+
+        for klass in cls._registry:
+            result.extend(klass.get_for(model=model))
+
+        return result
+
     @classmethod
     def get_help_text_for(cls, model, show_name=False):
         result = []
@@ -324,5 +324,5 @@ class Template(object):
         return self
 
 
-ModelProperty.register(ModelAttribute)
-ModelProperty.register(ModelField)
+ModelProperty.register(klass=ModelAttribute)
+ModelProperty.register(klass=ModelField)
diff --git a/mayan/apps/common/compressed_files.py b/mayan/apps/common/compressed_files.py
index eccf7f2fec..4bef477028 100644
--- a/mayan/apps/common/compressed_files.py
+++ b/mayan/apps/common/compressed_files.py
@@ -63,7 +63,7 @@ class Archive(object):
     def get_members(self):
         return (
             SimpleUploadedFile(
-                name=filename, content=self.member_contents(filename)
+                content=self.member_contents(filename=filename), name=filename
             ) for filename in self.members()
         )
 
@@ -161,14 +161,14 @@ class ZipArchive(Archive):
 
 
 Archive.register(
-    mime_types=('application/zip',), archive_classes=(ZipArchive,)
+    archive_classes=(ZipArchive,), mime_types=('application/zip',)
 )
 Archive.register(
-    mime_types=('application/x-tar',), archive_classes=(TarArchive,)
+    archive_classes=(TarArchive,), mime_types=('application/x-tar',)
 )
 Archive.register(
-    mime_types=('application/gzip',), archive_classes=(TarArchive,)
+    archive_classes=(TarArchive,), mime_types=('application/gzip',)
 )
 Archive.register(
-    mime_types=('application/x-bzip2',), archive_classes=(TarArchive,)
+    archive_classes=(TarArchive,), mime_types=('application/x-bzip2',)
 )
diff --git a/mayan/apps/common/handlers.py b/mayan/apps/common/handlers.py
index 45485e5729..2131380193 100644
--- a/mayan/apps/common/handlers.py
+++ b/mayan/apps/common/handlers.py
@@ -7,15 +7,19 @@ from django.utils import timezone, translation
 
 
 def handler_pre_initial_setup(sender, **kwargs):
-    management.call_command('migrate', interactive=False)
+    management.call_command(command_name='migrate', interactive=False)
 
 
 def handler_pre_upgrade(sender, **kwargs):
-    management.call_command('migrate', fake_initial=True, interactive=False)
-    management.call_command('purgeperiodictasks', interactive=False)
+    management.call_command(
+        command_name='migrate', fake_initial=True, interactive=False
+    )
+    management.call_command(
+        command_name='purgeperiodictasks', interactive=False
+    )
 
 
-def user_locale_profile_session_config(sender, request, user, **kwargs):
+def handler_user_locale_profile_session_config(sender, request, user, **kwargs):
     UserLocaleProfile = apps.get_model(
         app_label='common', model_name='UserLocaleProfile'
     )
@@ -46,7 +50,7 @@ def user_locale_profile_session_config(sender, request, user, **kwargs):
             )
 
 
-def user_locale_profile_create(sender, instance, created, **kwargs):
+def handler_user_locale_profile_create(sender, instance, created, **kwargs):
     UserLocaleProfile = apps.get_model(
         app_label='common', model_name='UserLocaleProfile'
     )
diff --git a/mayan/apps/common/management/commands/convertdb.py b/mayan/apps/common/management/commands/convertdb.py
index 3d4fe0c063..8327fae9a6 100644
--- a/mayan/apps/common/management/commands/convertdb.py
+++ b/mayan/apps/common/management/commands/convertdb.py
@@ -71,7 +71,7 @@ class Command(management.BaseCommand):
             )
         )
 
-        management.call_command('purgeperiodictasks')
+        management.call_command(command_name='purgeperiodictasks')
 
         management.call_command(
             'dumpdata', *app_labels, all=True,
@@ -89,7 +89,7 @@ class Command(management.BaseCommand):
             )
 
         management.call_command(
-            'loaddata', convertdb_file_path, database=options['to'],
-            interactive=False, verbosity=3
+            'loaddata', convertdb_file_path, database=options['to'], interactive=False,
+            verbosity=3
         )
         fs_cleanup(convertdb_file_path)
diff --git a/mayan/apps/common/management/commands/initialsetup.py b/mayan/apps/common/management/commands/initialsetup.py
index 456983279c..0b9755f145 100644
--- a/mayan/apps/common/management/commands/initialsetup.py
+++ b/mayan/apps/common/management/commands/initialsetup.py
@@ -89,7 +89,11 @@ class Command(management.BaseCommand):
         pre_initial_setup.send(sender=self)
 
         if not options.get('no_javascript', False):
-            management.call_command('installjavascript', interactive=False)
+            management.call_command(
+                command_name='installjavascript', interactive=False
+            )
 
-        management.call_command('createautoadmin', interactive=False)
+        management.call_command(
+            command_name='createautoadmin', interactive=False
+        )
         post_initial_setup.send(sender=self)
diff --git a/mayan/apps/common/management/commands/performupgrade.py b/mayan/apps/common/management/commands/performupgrade.py
index d2ba4999c8..5f358566f7 100644
--- a/mayan/apps/common/management/commands/performupgrade.py
+++ b/mayan/apps/common/management/commands/performupgrade.py
@@ -19,7 +19,9 @@ class Command(management.BaseCommand):
                 )
             )
 
-        management.call_command('installjavascript', interactive=False)
+        management.call_command(
+            command_name='installjavascript', interactive=False
+        )
 
         try:
             perform_upgrade.send(sender=self)
diff --git a/mayan/apps/common/permissions_runtime.py b/mayan/apps/common/permissions_runtime.py
index 7113393edd..20df80407a 100644
--- a/mayan/apps/common/permissions_runtime.py
+++ b/mayan/apps/common/permissions_runtime.py
@@ -4,8 +4,8 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.permissions import PermissionNamespace
 
-namespace = PermissionNamespace(name='common', label=_('Common'))
+namespace = PermissionNamespace(label=_('Common'), name='common')
 
 permission_error_log_view = namespace.add_permission(
-    name='error_log_view', label=_('View error log')
+    label=_('View error log'), name='error_log_view'
 )
diff --git a/mayan/apps/common/queues.py b/mayan/apps/common/queues.py
index bf649abb48..01569efe9e 100644
--- a/mayan/apps/common/queues.py
+++ b/mayan/apps/common/queues.py
@@ -5,13 +5,13 @@ from django.utils.translation import ugettext_lazy as _
 from mayan.apps.task_manager.classes import CeleryQueue
 
 queue_default = CeleryQueue(
-    name='default', label=_('Default'), is_default_queue=True
+    is_default_queue=True, label=_('Default'), name='default'
 )
-queue_tools = CeleryQueue(name='tools', label=_('Tools'))
+queue_tools = CeleryQueue(label=_('Tools'), name='tools')
 queue_common_periodic = CeleryQueue(
-    name='common_periodic', label=_('Common periodic'), transient=True
+    label=_('Common periodic'), name='common_periodic', transient=True
 )
 queue_common_periodic.add_task_type(
-    name='mayan.apps.common.tasks.task_delete_stale_uploads',
-    label=_('Delete stale uploads')
+    label=_('Delete stale uploads'),
+    name='mayan.apps.common.tasks.task_delete_stale_uploads'
 )
diff --git a/mayan/apps/common/settings.py b/mayan/apps/common/settings.py
index 209498b713..ec1727cccd 100644
--- a/mayan/apps/common/settings.py
+++ b/mayan/apps/common/settings.py
@@ -11,7 +11,7 @@ from mayan.apps.smart_settings import Namespace
 from .literals import DEFAULT_COMMON_HOME_VIEW
 
 
-namespace = Namespace(name='common', label=_('Common'))
+namespace = Namespace(label=_('Common'), name='common')
 
 setting_auto_logging = namespace.add_setting(
     global_name='COMMON_AUTO_LOGGING',
@@ -80,7 +80,7 @@ setting_shared_storage_arguments = namespace.add_setting(
     ), quoted=True
 )
 
-namespace = Namespace(name='django', label=_('Django'))
+namespace = Namespace(label=_('Django'), name='django')
 
 setting_django_allowed_hosts = namespace.add_setting(
     global_name='ALLOWED_HOSTS', default=settings.ALLOWED_HOSTS,
@@ -391,7 +391,7 @@ setting_django_wsgi_application = namespace.add_setting(
     ),
 )
 
-namespace = Namespace(name='celery', label=_('Celery'))
+namespace = Namespace(label=_('Celery'), name='celery')
 
 setting_celery_broker_url = namespace.add_setting(
     global_name='BROKER_URL', default=settings.BROKER_URL,
diff --git a/mayan/apps/common/templatetags/common_tags.py b/mayan/apps/common/templatetags/common_tags.py
index 059c6f1e43..8b8d82f712 100644
--- a/mayan/apps/common/templatetags/common_tags.py
+++ b/mayan/apps/common/templatetags/common_tags.py
@@ -17,7 +17,7 @@ register = Library()
 
 
 @register.simple_tag
-def check_sqlite():
+def common_check_sqlite():
     if check_for_sqlite():
         return MESSAGE_SQLITE_WARNING
 
diff --git a/mayan/apps/common/views.py b/mayan/apps/common/views.py
index e0aec0267b..3f21723f21 100644
--- a/mayan/apps/common/views.py
+++ b/mayan/apps/common/views.py
@@ -84,14 +84,14 @@ class CurrentUserLocaleProfileEditView(SingleObjectEditView):
     }
     form_class = LocaleProfileForm
     post_action_redirect = reverse_lazy(
-        'common:current_user_locale_profile_details'
+        viewname='common:current_user_locale_profile_details'
     )
 
     def form_valid(self, form):
         form.save()
 
-        timezone.activate(form.cleaned_data['timezone'])
-        translation.activate(form.cleaned_data['language'])
+        timezone.activate(timezone=form.cleaned_data['timezone'])
+        translation.activate(language=form.cleaned_data['language'])
 
         if hasattr(self.request, 'session'):
             self.request.session[
@@ -108,7 +108,9 @@ class CurrentUserLocaleProfileEditView(SingleObjectEditView):
                 settings.TIMEZONE_COOKIE_NAME, form.cleaned_data['timezone']
             )
 
-        return super(CurrentUserLocaleProfileEditView, self).form_valid(form)
+        return super(CurrentUserLocaleProfileEditView, self).form_valid(
+            form=form
+        )
 
     def get_object(self):
         return self.request.user.locale_profile
@@ -123,7 +125,7 @@ class FaviconRedirectView(RedirectView):
         processors
         """
         from django.contrib.staticfiles.templatetags.staticfiles import static
-        return static('appearance/images/favicon.ico')
+        return static(path='appearance/images/favicon.ico')
 
 
 class HomeView(SimpleView):
@@ -292,7 +294,7 @@ def multi_object_action_view(request):
             message=_('No action selected.'), request=request
         )
         return HttpResponseRedirect(
-            request.META.get(
+            redirect_to=request.META.get(
                 'HTTP_REFERER', resolve_url(settings.LOGIN_REDIRECT_URL)
             )
         )
@@ -303,7 +305,7 @@ def multi_object_action_view(request):
             request=request
         )
         return HttpResponseRedirect(
-            request.META.get(
+            redirect_to=request.META.get(
                 'HTTP_REFERER', resolve_url(settings.LOGIN_REDIRECT_URL)
             )
         )
@@ -312,7 +314,7 @@ def multi_object_action_view(request):
     # functions that don't expect a properties_list parameter
     if items_property_list:
         return HttpResponseRedirect(
-            '%s?%s' % (
+            redirect_to='%s?%s' % (
                 action,
                 urlencode(
                     {
@@ -323,7 +325,8 @@ def multi_object_action_view(request):
             )
         )
     else:
-        return HttpResponseRedirect('%s?%s' % (
-            action,
-            urlencode({'id_list': id_list, 'next': next}))
+        return HttpResponseRedirect(
+            redirect_to='%s?%s' % (
+                action, urlencode({'id_list': id_list, 'next': next})
+            )
         )
diff --git a/mayan/apps/common/widgets.py b/mayan/apps/common/widgets.py
index c6567a6c1a..f95552fa4e 100644
--- a/mayan/apps/common/widgets.py
+++ b/mayan/apps/common/widgets.py
@@ -31,9 +31,15 @@ class EmailInput(forms.widgets.Input):
     def render(self, name, value, attrs=None):
         if attrs is None:
             attrs = {}
-        attrs.update(dict(autocorrect='off',
-                          autocapitalize='off',
-                          spellcheck='false'))
+
+        attrs.update(
+            {
+                'autocorrect': 'off',
+                'autocapitalize': 'off',
+                'spellcheck': 'false'
+            }
+        )
+
         return super(EmailInput, self).render(name, value, attrs=attrs)
 
 
@@ -43,7 +49,7 @@ class PlainWidget(forms.widgets.Widget):
     widget and reduces the output to only it's value
     """
     def render(self, name, value, attrs=None):
-        return mark_safe('%s' % value)
+        return mark_safe(s='%s' % value)
 
 
 class TextAreaDiv(forms.widgets.Widget):
diff --git a/mayan/apps/converter/apps.py b/mayan/apps/converter/apps.py
index e0df3d274f..1ab7e4108b 100644
--- a/mayan/apps/converter/apps.py
+++ b/mayan/apps/converter/apps.py
@@ -24,15 +24,15 @@ class ConverterApp(MayanAppConfig):
     def ready(self):
         super(ConverterApp, self).ready()
 
-        Transformation = self.get_model('Transformation')
+        Transformation = self.get_model(model_name='Transformation')
 
-        SourceColumn(source=Transformation, label=_('Order'), attribute='order')
+        SourceColumn(attribute='order', source=Transformation)
         SourceColumn(
             source=Transformation, label=_('Transformation'),
             func=lambda context: force_text(context['object'])
         )
         SourceColumn(
-            source=Transformation, label=_('Arguments'), attribute='arguments'
+            attribute='arguments', source=Transformation
         )
 
         menu_object.bind_links(
diff --git a/mayan/apps/converter/permissions.py b/mayan/apps/converter/permissions.py
index 4135d03949..a111b9de1b 100644
--- a/mayan/apps/converter/permissions.py
+++ b/mayan/apps/converter/permissions.py
@@ -4,17 +4,17 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.permissions import PermissionNamespace
 
-namespace = PermissionNamespace(name='converter', label=_('Converter'))
+namespace = PermissionNamespace(label=_('Converter'), name='converter')
 
 permission_transformation_create = namespace.add_permission(
-    name='transformation_create', label=_('Create new transformations')
+    label=_('Create new transformations'), name='transformation_create'
 )
 permission_transformation_delete = namespace.add_permission(
-    name='transformation_delete', label=_('Delete transformations')
+    label=_('Delete transformations'), name='transformation_delete'
 )
 permission_transformation_edit = namespace.add_permission(
-    name='transformation_edit', label=_('Edit transformations')
+    label=_('Edit transformations'), name='transformation_edit'
 )
 permission_transformation_view = namespace.add_permission(
-    name='transformation_view', label=_('View existing transformations')
+    label=_('View existing transformations'), name='transformation_view'
 )
diff --git a/mayan/apps/converter/runtime.py b/mayan/apps/converter/runtime.py
index acfc7d1e7f..1af7f31380 100644
--- a/mayan/apps/converter/runtime.py
+++ b/mayan/apps/converter/runtime.py
@@ -1,10 +1,9 @@
 from __future__ import unicode_literals
 
-import logging
-
 from django.utils.module_loading import import_string
 
 from .settings import setting_graphics_backend
 
-logger = logging.getLogger(__name__)
-backend = converter_class = import_string(setting_graphics_backend.value)
+backend = converter_class = import_string(
+    dotted_path=setting_graphics_backend.value
+)
diff --git a/mayan/apps/converter/settings.py b/mayan/apps/converter/settings.py
index b75f8689d8..14ce07a295 100644
--- a/mayan/apps/converter/settings.py
+++ b/mayan/apps/converter/settings.py
@@ -9,7 +9,8 @@ from .literals import (
     DEFAULT_PDFTOPPM_PATH, DEFAULT_PDFINFO_PATH, DEFAULT_PILLOW_FORMAT
 )
 
-namespace = Namespace(name='converter', label=_('Converter'))
+namespace = Namespace(label=_('Converter'), name='converter')
+
 setting_graphics_backend = namespace.add_setting(
     default='mayan.apps.converter.backends.python.Python',
     help_text=_('Graphics conversion backend to use.'),
diff --git a/mayan/apps/converter/transformations.py b/mayan/apps/converter/transformations.py
index 2aad214b62..e9eada168a 100644
--- a/mayan/apps/converter/transformations.py
+++ b/mayan/apps/converter/transformations.py
@@ -315,15 +315,15 @@ class TransformationZoom(BaseTransformation):
         )
 
 
-BaseTransformation.register(TransformationCrop)
-BaseTransformation.register(TransformationFlip)
-BaseTransformation.register(TransformationGaussianBlur)
-BaseTransformation.register(TransformationLineArt)
-BaseTransformation.register(TransformationMirror)
-BaseTransformation.register(TransformationResize)
-BaseTransformation.register(TransformationRotate)
-BaseTransformation.register(TransformationRotate90)
-BaseTransformation.register(TransformationRotate180)
-BaseTransformation.register(TransformationRotate270)
-BaseTransformation.register(TransformationUnsharpMask)
-BaseTransformation.register(TransformationZoom)
+BaseTransformation.register(transformation=TransformationCrop)
+BaseTransformation.register(transformation=TransformationFlip)
+BaseTransformation.register(transformation=TransformationGaussianBlur)
+BaseTransformation.register(transformation=TransformationLineArt)
+BaseTransformation.register(transformation=TransformationMirror)
+BaseTransformation.register(transformation=TransformationResize)
+BaseTransformation.register(transformation=TransformationRotate)
+BaseTransformation.register(transformation=TransformationRotate90)
+BaseTransformation.register(transformation=TransformationRotate180)
+BaseTransformation.register(transformation=TransformationRotate270)
+BaseTransformation.register(transformation=TransformationUnsharpMask)
+BaseTransformation.register(transformation=TransformationZoom)
diff --git a/mayan/apps/converter/views.py b/mayan/apps/converter/views.py
index 60c85be028..239b2ad37b 100644
--- a/mayan/apps/converter/views.py
+++ b/mayan/apps/converter/views.py
@@ -27,54 +27,6 @@ from .permissions import (
 logger = logging.getLogger(__name__)
 
 
-class TransformationDeleteView(SingleObjectDeleteView):
-    model = Transformation
-
-    def dispatch(self, request, *args, **kwargs):
-        self.transformation = get_object_or_404(
-            klass=Transformation, pk=self.kwargs['pk']
-        )
-
-        AccessControlList.objects.check_access(
-            permissions=permission_transformation_delete, user=request.user,
-            obj=self.transformation.content_object
-        )
-
-        return super(TransformationDeleteView, self).dispatch(
-            request, *args, **kwargs
-        )
-
-    def get_post_action_redirect(self):
-        return reverse(
-            viewname='converter:transformation_list', kwargs={
-                'app_label': self.transformation.content_type.app_label,
-                'model': self.transformation.content_type.model,
-                'object_id': self.transformation.object_id
-            }
-        )
-
-    def get_extra_context(self):
-        return {
-            'content_object': self.transformation.content_object,
-            'navigation_object_list': ('content_object', 'transformation'),
-            'previous': reverse(
-                viewname='converter:transformation_list', kwargs={
-                    'app_label': self.transformation.content_type.app_label,
-                    'model': self.transformation.content_type.model,
-                    'object_id': self.transformation.object_id
-                }
-            ),
-            'title': _(
-                'Delete transformation "%(transformation)s" for: '
-                '%(content_object)s?'
-            ) % {
-                'transformation': self.transformation,
-                'content_object': self.transformation.content_object
-            },
-            'transformation': self.transformation,
-        }
-
-
 class TransformationCreateView(SingleObjectCreateView):
     form_class = TransformationForm
 
@@ -92,8 +44,8 @@ class TransformationCreateView(SingleObjectCreateView):
             raise Http404
 
         AccessControlList.objects.check_access(
-            permissions=permission_transformation_create, user=request.user,
-            obj=self.content_object
+            obj=self.content_object,
+            permissions=permission_transformation_create, user=request.user
         )
 
         return super(TransformationCreateView, self).dispatch(
@@ -134,6 +86,54 @@ class TransformationCreateView(SingleObjectCreateView):
         return Transformation.objects.get_for_model(self.content_object)
 
 
+class TransformationDeleteView(SingleObjectDeleteView):
+    model = Transformation
+
+    def dispatch(self, request, *args, **kwargs):
+        self.transformation = get_object_or_404(
+            klass=Transformation, pk=self.kwargs['pk']
+        )
+
+        AccessControlList.objects.check_access(
+            obj=self.transformation.content_object,
+            permissions=permission_transformation_delete, user=request.user
+        )
+
+        return super(TransformationDeleteView, self).dispatch(
+            request, *args, **kwargs
+        )
+
+    def get_post_action_redirect(self):
+        return reverse(
+            viewname='converter:transformation_list', kwargs={
+                'app_label': self.transformation.content_type.app_label,
+                'model': self.transformation.content_type.model,
+                'object_id': self.transformation.object_id
+            }
+        )
+
+    def get_extra_context(self):
+        return {
+            'content_object': self.transformation.content_object,
+            'navigation_object_list': ('content_object', 'transformation'),
+            'previous': reverse(
+                viewname='converter:transformation_list', kwargs={
+                    'app_label': self.transformation.content_type.app_label,
+                    'model': self.transformation.content_type.model,
+                    'object_id': self.transformation.object_id
+                }
+            ),
+            'title': _(
+                'Delete transformation "%(transformation)s" for: '
+                '%(content_object)s?'
+            ) % {
+                'transformation': self.transformation,
+                'content_object': self.transformation.content_object
+            },
+            'transformation': self.transformation,
+        }
+
+
 class TransformationEditView(SingleObjectEditView):
     form_class = TransformationForm
     model = Transformation
@@ -144,8 +144,8 @@ class TransformationEditView(SingleObjectEditView):
         )
 
         AccessControlList.objects.check_access(
-            permissions=permission_transformation_edit, user=request.user,
-            obj=self.transformation.content_object
+            obj=self.transformation.content_object,
+            permissions=permission_transformation_edit, user=request.user
         )
 
         return super(TransformationEditView, self).dispatch(
@@ -159,9 +159,9 @@ class TransformationEditView(SingleObjectEditView):
             instance.save()
         except Exception as exception:
             logger.debug('Invalid form, exception: %s', exception)
-            return super(TransformationEditView, self).form_invalid(form)
+            return super(TransformationEditView, self).form_invalid(form=form)
         else:
-            return super(TransformationEditView, self).form_valid(form)
+            return super(TransformationEditView, self).form_valid(form=form)
 
     def get_extra_context(self):
         return {
@@ -201,8 +201,8 @@ class TransformationListView(SingleObjectListView):
             raise Http404
 
         AccessControlList.objects.check_access(
-            permissions=permission_transformation_view, user=request.user,
-            obj=self.content_object
+            obj=self.content_object,
+            permissions=permission_transformation_view, user=request.user
         )
 
         return super(TransformationListView, self).dispatch(
@@ -231,4 +231,4 @@ class TransformationListView(SingleObjectListView):
         }
 
     def get_object_list(self):
-        return Transformation.objects.get_for_model(self.content_object)
+        return Transformation.objects.get_for_model(obj=self.content_object)
diff --git a/mayan/apps/django_gpg/apps.py b/mayan/apps/django_gpg/apps.py
index f88572d746..ae3c97de9b 100644
--- a/mayan/apps/django_gpg/apps.py
+++ b/mayan/apps/django_gpg/apps.py
@@ -35,7 +35,7 @@ class DjangoGPGApp(MayanAppConfig):
     def ready(self):
         super(DjangoGPGApp, self).ready()
 
-        Key = self.get_model('Key')
+        Key = self.get_model(model_name='Key')
 
         ModelPermission.register(
             model=Key, permissions=(
@@ -45,22 +45,22 @@ class DjangoGPGApp(MayanAppConfig):
             )
         )
 
-        SourceColumn(source=Key, label=_('Key ID'), attribute='key_id')
-        SourceColumn(source=Key, label=_('User ID'), attribute='user_id')
+        SourceColumn(attribute='key_id', label=_('Key ID'), source=Key)
+        SourceColumn(attribute='user_id', source=Key)
 
-        SourceColumn(source=KeyStub, label=_('Key ID'), attribute='key_id')
-        SourceColumn(source=KeyStub, label=_('Type'), attribute='key_type')
+        SourceColumn(attribute='key_id', label=_('Key ID'), source=KeyStub)
+        SourceColumn(attribute='key_type', label=_('Type'), source=KeyStub)
         SourceColumn(
-            source=KeyStub, label=_('Creation date'), attribute='date'
+            attribute='date', label=_('Creation date'), source=KeyStub
         )
         SourceColumn(
-            source=KeyStub, label=_('Expiration date'),
-            func=lambda context: context['object'].expires or _('No expiration')
+            func=lambda context: context['object'].expires or _('No expiration'),
+            label=_('Expiration date'), source=KeyStub
         )
-        SourceColumn(source=KeyStub, label=_('Length'), attribute='length')
+        SourceColumn(attribute='length', label=_('Length'), source=KeyStub)
         SourceColumn(
-            source=KeyStub, label=_('User ID'),
-            func=lambda context: ', '.join(context['object'].user_id)
+            func=lambda context: ', '.join(context['object'].user_id),
+            label=_('User ID'), source=KeyStub
         )
 
         menu_object.bind_links(links=(link_key_detail,), sources=(Key,))
diff --git a/mayan/apps/django_gpg/managers.py b/mayan/apps/django_gpg/managers.py
index d565e8ae2a..604410049c 100644
--- a/mayan/apps/django_gpg/managers.py
+++ b/mayan/apps/django_gpg/managers.py
@@ -23,7 +23,7 @@ class KeyManager(models.Manager):
     def _preload_keys(self, all_keys=False, key_fingerprint=None, key_id=None):
         # Preload keys
         if all_keys:
-            logger.debug('preloading all keys')
+            logger.debug(msg='preloading all keys')
             keys = self.values()
         elif key_fingerprint:
             logger.debug('preloading key fingerprint: %s', key_fingerprint)
@@ -121,17 +121,17 @@ class KeyManager(models.Manager):
 
         if verify_result:
             # Signed and key present
-            logger.debug('signed and key present')
+            logger.debug(msg='signed and key present')
             return SignatureVerification(verify_result.__dict__)
         elif verify_result.status == 'no public key' and not (key_fingerprint or all_keys or key_id):
             # Signed but key not present, retry with key fetch
-            logger.debug('no public key')
+            logger.debug(msg='no public key')
             file_object.seek(0)
             return self.verify_file(file_object=file_object, signature_file=signature_file, key_id=verify_result.key_id)
         elif verify_result.key_id:
             # Signed, retried and key still not found
-            logger.debug('signed, retried and key still not found')
+            logger.debug(msg='signed, retried and key still not found')
             return SignatureVerification(verify_result.__dict__)
         else:
-            logger.debug('file not signed')
+            logger.debug(msg='file not signed')
             raise VerificationError('File not signed')
diff --git a/mayan/apps/django_gpg/permissions.py b/mayan/apps/django_gpg/permissions.py
index cc2fb04a3d..c2a2ab2cb9 100644
--- a/mayan/apps/django_gpg/permissions.py
+++ b/mayan/apps/django_gpg/permissions.py
@@ -4,26 +4,26 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.permissions import PermissionNamespace
 
-namespace = PermissionNamespace(name='django_gpg', label=_('Key management'))
+namespace = PermissionNamespace(label=_('Key management'), name='django_gpg')
 
 permission_key_delete = namespace.add_permission(
-    name='key_delete', label=_('Delete keys')
+    label=_('Delete keys'), name='key_delete'
 )
 permission_key_download = namespace.add_permission(
-    name='key_download', label=_('Download keys')
+    label=_('Download keys'), name='key_download'
 )
 permission_key_receive = namespace.add_permission(
-    name='key_receive', label=_('Import keys from keyservers')
+    label=_('Import keys from keyservers'), name='key_receive'
 )
 permission_key_sign = namespace.add_permission(
-    name='key_sign', label=_('Use keys to sign content')
+    label=_('Use keys to sign content'), name='key_sign'
 )
 permission_key_upload = namespace.add_permission(
-    name='key_upload', label=_('Upload keys')
+    label=_('Upload keys'), name='key_upload'
 )
 permission_key_view = namespace.add_permission(
-    name='key_view', label=_('View keys')
+    label=_('View keys'), name='key_view'
 )
 permission_keyserver_query = namespace.add_permission(
-    name='keyserver_query', label=_('Query keyservers')
+    label=_('Query keyservers'), name='keyserver_query'
 )
diff --git a/mayan/apps/django_gpg/settings.py b/mayan/apps/django_gpg/settings.py
index 0f7aff18aa..b7c763f45f 100644
--- a/mayan/apps/django_gpg/settings.py
+++ b/mayan/apps/django_gpg/settings.py
@@ -7,7 +7,8 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.smart_settings import Namespace
 
-namespace = Namespace(name='django_gpg', label=_('Signatures'))
+namespace = Namespace(label=_('Signatures'), name='django_gpg')
+
 setting_gpg_home = namespace.add_setting(
     global_name='SIGNATURES_GPG_HOME',
     default=os.path.join(settings.MEDIA_ROOT, 'gpg_home'),
diff --git a/mayan/apps/django_gpg/views.py b/mayan/apps/django_gpg/views.py
index 10106203bb..8cac032ac1 100644
--- a/mayan/apps/django_gpg/views.py
+++ b/mayan/apps/django_gpg/views.py
@@ -31,15 +31,15 @@ class KeyDeleteView(SingleObjectDeleteView):
     model = Key
     object_permission = permission_key_delete
 
-    def get_post_action_redirect(self):
-        if self.get_object().key_type == KEY_TYPE_PUBLIC:
-            return reverse_lazy('django_gpg:key_public_list')
-        else:
-            return reverse_lazy('django_gpg:key_private_list')
-
     def get_extra_context(self):
         return {'title': _('Delete key: %s') % self.get_object()}
 
+    def get_post_action_redirect(self):
+        if self.get_object().key_type == KEY_TYPE_PUBLIC:
+            return reverse_lazy(viewname='django_gpg:key_public_list')
+        else:
+            return reverse_lazy(viewname='django_gpg:key_private_list')
+
 
 class KeyDetailView(SingleObjectDetailView):
     form_class = KeyDetailForm
@@ -92,28 +92,6 @@ class KeyReceive(ConfirmView):
             )
 
 
-class KeyQueryView(SimpleView):
-    template_name = 'appearance/generic_form.html'
-    view_permission = permission_keyserver_query
-
-    def get_form(self):
-        if ('term' in self.request.GET) and self.request.GET['term'].strip():
-            term = self.request.GET['term']
-            return KeySearchForm(initial={'term': term})
-        else:
-            return KeySearchForm()
-
-    def get_extra_context(self):
-        return {
-            'form': self.get_form(),
-            'form_action': reverse('django_gpg:key_query_results'),
-            'submit_icon_class': icon_keyserver_search,
-            'submit_label': _('Search'),
-            'submit_method': 'GET',
-            'title': _('Query key server'),
-        }
-
-
 class KeyQueryResultView(SingleObjectListView):
     view_permission = permission_keyserver_query
 
@@ -142,6 +120,28 @@ class KeyQueryResultView(SingleObjectListView):
             return ()
 
 
+class KeyQueryView(SimpleView):
+    template_name = 'appearance/generic_form.html'
+    view_permission = permission_keyserver_query
+
+    def get_extra_context(self):
+        return {
+            'form': self.get_form(),
+            'form_action': reverse('django_gpg:key_query_results'),
+            'submit_icon_class': icon_keyserver_search,
+            'submit_label': _('Search'),
+            'submit_method': 'GET',
+            'title': _('Query key server'),
+        }
+
+    def get_form(self):
+        if ('term' in self.request.GET) and self.request.GET['term'].strip():
+            term = self.request.GET['term']
+            return KeySearchForm(initial={'term': term})
+        else:
+            return KeySearchForm()
+
+
 class KeyUploadView(SingleObjectCreateView):
     fields = ('key_data',)
     model = Key
@@ -154,6 +154,29 @@ class KeyUploadView(SingleObjectCreateView):
         }
 
 
+class PrivateKeyListView(SingleObjectListView):
+    object_permission = permission_key_view
+    queryset = Key.objects.private_keys()
+
+    def get_extra_context(self):
+        return {
+            'hide_object': True,
+            'no_results_icon': icon_key_setup,
+            'no_results_main_link': link_key_upload.resolve(
+                context=RequestContext(request=self.request)
+            ),
+            'no_results_text': _(
+                'Private keys are used to signed documents. '
+                'Private keys can only be uploaded by the user.'
+                'The view to upload private and public keys is the same.'
+            ),
+            'no_results_title': _(
+                'There no private keys'
+            ),
+            'title': _('Private keys')
+        }
+
+
 class PublicKeyListView(SingleObjectListView):
     object_permission = permission_key_view
     queryset = Key.objects.public_keys()
@@ -176,26 +199,3 @@ class PublicKeyListView(SingleObjectListView):
             ),
             'title': _('Public keys')
         }
-
-
-class PrivateKeyListView(SingleObjectListView):
-    object_permission = permission_key_view
-    queryset = Key.objects.private_keys()
-
-    def get_extra_context(self):
-        return {
-            'hide_object': True,
-            'no_results_icon': icon_key_setup,
-            'no_results_main_link': link_key_upload.resolve(
-                context=RequestContext(request=self.request)
-            ),
-            'no_results_text': _(
-                'Private keys are used to signed documents. '
-                'Private keys can only be uploaded by the user.'
-                'The view to upload private and public keys is the same.'
-            ),
-            'no_results_title': _(
-                'There no private keys'
-            ),
-            'title': _('Private keys')
-        }
diff --git a/mayan/apps/document_comments/api_views.py b/mayan/apps/document_comments/api_views.py
index 04ea5b0897..1a56b501af 100644
--- a/mayan/apps/document_comments/api_views.py
+++ b/mayan/apps/document_comments/api_views.py
@@ -30,8 +30,8 @@ class APICommentListView(generics.ListCreateAPIView):
         )
 
         AccessControlList.objects.check_access(
-            permissions=permission_required, user=self.request.user,
-            obj=document
+            obj=document, permissions=permission_required,
+            user=self.request.user
         )
 
         return document
@@ -85,8 +85,8 @@ class APICommentView(generics.RetrieveDestroyAPIView):
         )
 
         AccessControlList.objects.check_access(
-            permissions=permission_required, user=self.request.user,
-            obj=document
+            obj=document, permissions=permission_required,
+            user=self.request.user
         )
 
         return document
diff --git a/mayan/apps/document_comments/apps.py b/mayan/apps/document_comments/apps.py
index a5bb9fb974..cdad80c8a6 100644
--- a/mayan/apps/document_comments/apps.py
+++ b/mayan/apps/document_comments/apps.py
@@ -37,7 +37,7 @@ class DocumentCommentsApp(MayanAppConfig):
             app_label='documents', model_name='Document'
         )
 
-        Comment = self.get_model('Comment')
+        Comment = self.get_model(model_name='Comment')
 
         ModelEventType.register(
             model=Document, event_types=(
@@ -52,12 +52,12 @@ class DocumentCommentsApp(MayanAppConfig):
             )
         )
 
-        SourceColumn(source=Comment, label=_('Date'), attribute='submit_date')
+        SourceColumn(attribute='submit_date', source=Comment)
         SourceColumn(
-            source=Comment, label=_('User'),
-            func=lambda context: context['object'].user.get_full_name() if context['object'].user.get_full_name() else context['object'].user
+            func=lambda context: context['object'].user.get_full_name() if context['object'].user.get_full_name() else context['object'].user,
+            source=Comment
         )
-        SourceColumn(source=Comment, label=_('Comment'), attribute='comment')
+        SourceColumn(attribute='comment', source=Comment)
 
         document_page_search.add_model_field(
             field='document_version__document__comments__comment',
diff --git a/mayan/apps/document_comments/permissions.py b/mayan/apps/document_comments/permissions.py
index c18b082ef0..a5fa60a7d2 100644
--- a/mayan/apps/document_comments/permissions.py
+++ b/mayan/apps/document_comments/permissions.py
@@ -4,14 +4,14 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.permissions import PermissionNamespace
 
-namespace = PermissionNamespace(name='comments', label=_('Comments'))
+namespace = PermissionNamespace(label=_('Comments'), name='comments')
 
 permission_comment_create = namespace.add_permission(
-    name='comment_create', label=_('Create new comments')
+    label=_('Create new comments'), name='comment_create'
 )
 permission_comment_delete = namespace.add_permission(
-    name='comment_delete', label=_('Delete comments')
+    label=_('Delete comments'), name='comment_delete'
 )
 permission_comment_view = namespace.add_permission(
-    name='comment_view', label=_('View comments')
+    label=_('View comments'), name='comment_view'
 )
diff --git a/mayan/apps/document_comments/views.py b/mayan/apps/document_comments/views.py
index 18a26baf9f..04815d62db 100644
--- a/mayan/apps/document_comments/views.py
+++ b/mayan/apps/document_comments/views.py
@@ -26,8 +26,8 @@ class DocumentCommentCreateView(SingleObjectCreateView):
 
     def dispatch(self, request, *args, **kwargs):
         AccessControlList.objects.check_access(
-            permissions=permission_comment_create, user=request.user,
-            obj=self.get_document()
+            obj=self.get_document(), permissions=permission_comment_create,
+            user=request.user
         )
 
         return super(
@@ -66,8 +66,8 @@ class DocumentCommentDeleteView(SingleObjectDeleteView):
 
     def dispatch(self, request, *args, **kwargs):
         AccessControlList.objects.check_access(
-            permissions=permission_comment_delete, user=request.user,
-            obj=self.get_object().document
+            obj=self.get_object().document,
+            permissions=permission_comment_delete, user=request.user
         )
 
         return super(
@@ -116,8 +116,8 @@ class DocumentCommentListView(SingleObjectListView):
 
     def get_object_list(self):
         AccessControlList.objects.check_access(
-            permissions=permission_comment_view, user=self.request.user,
-            obj=self.get_document()
+            obj=self.get_document(), permissions=permission_comment_view,
+            user=self.request.user
         )
 
         return self.get_document().comments.all()
diff --git a/mayan/apps/document_indexing/api_views.py b/mayan/apps/document_indexing/api_views.py
index 095a1bdd23..cb803bd4a7 100644
--- a/mayan/apps/document_indexing/api_views.py
+++ b/mayan/apps/document_indexing/api_views.py
@@ -66,8 +66,9 @@ class APIIndexNodeInstanceDocumentListView(generics.ListAPIView):
             klass=IndexInstanceNode, pk=self.kwargs['pk']
         )
         AccessControlList.objects.check_access(
+            obj=index_node_instance.index,
             permissions=permission_document_indexing_view,
-            user=self.request.user, obj=index_node_instance.index
+            user=self.request.user
         )
 
         return index_node_instance.documents.all()
@@ -112,8 +113,8 @@ class APIDocumentIndexListView(generics.ListAPIView):
     def get_queryset(self):
         document = get_object_or_404(klass=Document, pk=self.kwargs['pk'])
         AccessControlList.objects.check_access(
-            permissions=permission_document_view, user=self.request.user,
-            obj=document
+            obj=document, permissions=permission_document_view,
+            user=self.request.user
         )
 
         return document.index_instance_nodes.all()
diff --git a/mayan/apps/document_indexing/apps.py b/mayan/apps/document_indexing/apps.py
index 3c2a1d56bf..671abe4bd4 100644
--- a/mayan/apps/document_indexing/apps.py
+++ b/mayan/apps/document_indexing/apps.py
@@ -20,7 +20,7 @@ from mayan.apps.navigation import SourceColumn
 from mayan.celery import app
 
 from .handlers import (
-    create_default_document_index, handler_delete_empty,
+    handler_create_default_document_index, handler_delete_empty,
     handler_index_document, handler_remove_document,
     handler_post_save_index_document
 )
@@ -64,12 +64,14 @@ class DocumentIndexingApp(MayanAppConfig):
             app_label='documents', model_name='DocumentType'
         )
 
-        DocumentIndexInstanceNode = self.get_model('DocumentIndexInstanceNode')
+        DocumentIndexInstanceNode = self.get_model(
+            model_name='DocumentIndexInstanceNode'
+        )
 
-        Index = self.get_model('Index')
-        IndexInstance = self.get_model('IndexInstance')
-        IndexInstanceNode = self.get_model('IndexInstanceNode')
-        IndexTemplateNode = self.get_model('IndexTemplateNode')
+        Index = self.get_model(model_name='Index')
+        IndexInstance = self.get_model(model_name='IndexInstance')
+        IndexInstanceNode = self.get_model(model_name='IndexInstanceNode')
+        IndexTemplateNode = self.get_model(model_name='IndexTemplateNode')
 
         ModelPermission.register(
             model=Index, permissions=(
@@ -96,23 +98,22 @@ class DocumentIndexingApp(MayanAppConfig):
         )
 
         SourceColumn(
-            source=IndexInstance, label=_('Total levels'),
             func=lambda context: context[
                 'object'
-            ].instance_root.get_descendants_count()
+            ].instance_root.get_descendants_count(), label=_('Total levels'),
+            source=IndexInstance
         )
         SourceColumn(
-            source=IndexInstance, label=_('Total documents'),
             func=lambda context: context[
                 'object'
             ].instance_root.get_descendants_document_count(
                 user=context['request'].user
-            )
+            ), label=_('Total documents'), source=IndexInstance
         )
 
         SourceColumn(
-            source=IndexTemplateNode, label=_('Level'),
-            func=lambda context: node_level(context['object'])
+            func=lambda context: node_level(context['object']),
+            label=_('Level'), source=IndexTemplateNode
         )
         SourceColumn(
             attribute='enabled', is_sortable=True, source=IndexTemplateNode,
@@ -123,39 +124,36 @@ class DocumentIndexingApp(MayanAppConfig):
             widget=TwoStateWidget
         )
         SourceColumn(
-            source=IndexInstanceNode, label=_('Level'),
-            func=lambda context: index_instance_item_link(context['object'])
+            func=lambda context: index_instance_item_link(context['object']),
+            label=_('Level'), source=IndexInstanceNode
         )
         SourceColumn(
-            source=IndexInstanceNode, label=_('Levels'),
-            func=lambda context: context['object'].get_descendants_count()
+            func=lambda context: context['object'].get_descendants_count(),
+            label=_('Levels'), source=IndexInstanceNode
         )
         SourceColumn(
-            source=IndexInstanceNode, label=_('Documents'),
             func=lambda context: context[
                 'object'
             ].get_descendants_document_count(
                 user=context['request'].user
-            )
+            ), label=_('Documents'), source=IndexInstanceNode
         )
 
         SourceColumn(
-            label=_('Level'),
             func=lambda context: get_instance_link(
                 index_instance_node=context['object'],
-            ), source=DocumentIndexInstanceNode,
+            ), label=_('Level'), source=DocumentIndexInstanceNode
         )
         SourceColumn(
-            source=DocumentIndexInstanceNode, label=_('Levels'),
-            func=lambda context: context['object'].get_descendants_count()
+            func=lambda context: context['object'].get_descendants_count(),
+            label=_('Levels'), source=DocumentIndexInstanceNode
         )
         SourceColumn(
-            source=DocumentIndexInstanceNode, label=_('Documents'),
             func=lambda context: context[
                 'object'
             ].get_descendants_document_count(
                 user=context['request'].user
-            )
+            ), label=_('Documents'), source=DocumentIndexInstanceNode
         )
 
         app.conf.CELERY_QUEUES.append(
@@ -221,8 +219,8 @@ class DocumentIndexingApp(MayanAppConfig):
             sender=Document
         )
         post_initial_document_type.connect(
-            dispatch_uid='document_indexing_create_default_document_index',
-            receiver=create_default_document_index,
+            dispatch_uid='document_indexing_handler_create_default_document_index',
+            receiver=handler_create_default_document_index,
             sender=DocumentType
         )
         post_save.connect(
diff --git a/mayan/apps/document_indexing/handlers.py b/mayan/apps/document_indexing/handlers.py
index 572095b43b..76fa0772ae 100644
--- a/mayan/apps/document_indexing/handlers.py
+++ b/mayan/apps/document_indexing/handlers.py
@@ -8,7 +8,7 @@ from .tasks import (
 )
 
 
-def create_default_document_index(sender, **kwargs):
+def handler_create_default_document_index(sender, **kwargs):
     DocumentType = apps.get_model(
         app_label='documents', model_name='DocumentType'
     )
diff --git a/mayan/apps/document_indexing/html_widgets.py b/mayan/apps/document_indexing/html_widgets.py
index bdaa1ba37c..d0715fcfc6 100644
--- a/mayan/apps/document_indexing/html_widgets.py
+++ b/mayan/apps/document_indexing/html_widgets.py
@@ -14,7 +14,7 @@ def get_instance_link(index_instance_node):
     Return an HTML anchor to an index node instance
     """
     return mark_safe(
-        '<a href="{url}">{text}</a>'.format(
+        s='<a href="{url}">{text}</a>'.format(
             url=index_instance_node.get_absolute_url(),
             text=escape(index_instance_node.get_full_path())
         )
@@ -35,7 +35,7 @@ def index_instance_item_link(index_instance_item):
         icon = ''
 
     return mark_safe(
-        '%(icon)s&nbsp;<a href="%(url)s">%(text)s</a>' % {
+        s='%(icon)s&nbsp;<a href="%(url)s">%(text)s</a>' % {
             'url': index_instance_item.get_absolute_url(),
             'icon': icon,
             'text': index_instance_item
@@ -48,7 +48,7 @@ def node_level(node):
     Render an indented tree like output for a specific node
     """
     return mark_safe(
-        ''.join(
+        s=''.join(
             [
                 '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;' * node.get_level(),
                 '' if node.is_root_node() else icon_index_level_up.render(),
diff --git a/mayan/apps/document_indexing/models.py b/mayan/apps/document_indexing/models.py
index 7b67064d0f..5a9e923ffc 100644
--- a/mayan/apps/document_indexing/models.py
+++ b/mayan/apps/document_indexing/models.py
@@ -63,8 +63,8 @@ class Index(models.Model):
     def get_absolute_url(self):
         try:
             return reverse(
-                'indexing:index_instance_node_view',
-                args=(self.instance_root.pk,)
+                viewname='indexing:index_instance_node_view',
+                kwargs={'pk': self.instance_root.pk}
             )
         except IndexInstanceNode.DoesNotExist:
             return '#'
@@ -357,7 +357,11 @@ class IndexInstanceNode(MPTTModel):
                 lock.release()
 
     def get_absolute_url(self):
-        return reverse('indexing:index_instance_node_view', args=(self.pk,))
+        return reverse(
+            viewname='indexing:index_instance_node_view', kwargs={
+                'pk': self.pk
+            }
+        )
 
     def get_children_count(self):
         return self.get_children().count()
@@ -367,12 +371,12 @@ class IndexInstanceNode(MPTTModel):
 
     def get_descendants_document_count(self, user):
         return AccessControlList.objects.filter_by_access(
-            permission=permission_document_view, user=user,
+            permission=permission_document_view,
             queryset=Document.objects.filter(
                 index_instance_nodes__in=self.get_descendants(
                     include_self=True
                 )
-            )
+            ), user=user
         ).count()
 
     def get_full_path(self):
@@ -388,7 +392,8 @@ class IndexInstanceNode(MPTTModel):
     def get_item_count(self, user):
         if self.index_template_node.link_documents:
             queryset = AccessControlList.objects.filter_by_access(
-                permission_document_view, user, queryset=self.documents
+                permission=permission_document_view, queryset=self.documents,
+                user=user
             )
 
             return queryset.count()
diff --git a/mayan/apps/document_indexing/permissions.py b/mayan/apps/document_indexing/permissions.py
index 1bab21761a..39fddadf1a 100644
--- a/mayan/apps/document_indexing/permissions.py
+++ b/mayan/apps/document_indexing/permissions.py
@@ -4,24 +4,24 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.permissions import PermissionNamespace
 
-namespace = PermissionNamespace(name='document_indexing', label=_('Indexing'))
+namespace = PermissionNamespace(label=_('Indexing'), name='document_indexing')
 
 permission_document_indexing_create = namespace.add_permission(
-    name='document_index_create', label=_('Create new document indexes')
+    label=_('Create new document indexes'), name='document_index_create'
 )
 permission_document_indexing_edit = namespace.add_permission(
-    name='document_index_edit', label=_('Edit document indexes')
+    label=_('Edit document indexes'), name='document_index_edit'
 )
 permission_document_indexing_delete = namespace.add_permission(
-    name='document_index_delete', label=_('Delete document indexes')
+    label=_('Delete document indexes'), name='document_index_delete'
 )
 permission_document_indexing_instance_view = namespace.add_permission(
-    name='document_index_instance_view',
-    label=_('View document index instances')
+    label=_('View document index instances'),
+    name='document_index_instance_view'
 )
 permission_document_indexing_view = namespace.add_permission(
-    name='document_index_view', label=_('View document indexes')
+    label=_('View document indexes'), name='document_index_view'
 )
 permission_document_indexing_rebuild = namespace.add_permission(
-    name='document_rebuild_indexes', label=_('Rebuild document indexes')
+    label=_('Rebuild document indexes'), name='document_rebuild_indexes'
 )
diff --git a/mayan/apps/document_indexing/queues.py b/mayan/apps/document_indexing/queues.py
index 96347ba0ef..f8749d9235 100644
--- a/mayan/apps/document_indexing/queues.py
+++ b/mayan/apps/document_indexing/queues.py
@@ -5,21 +5,21 @@ from django.utils.translation import ugettext_lazy as _
 from mayan.apps.common.queues import queue_tools
 from mayan.apps.task_manager.classes import CeleryQueue
 
-queue_indexing = CeleryQueue(name='indexing', label=_('Indexing'))
+queue_indexing = CeleryQueue(label=_('Indexing'), name='indexing')
 
 queue_indexing.add_task_type(
-    name='mayan.apps.document_indexing.tasks.task_delete_empty',
-    label=_('Delete empty index nodes')
+    label=_('Delete empty index nodes'),
+    name='mayan.apps.document_indexing.tasks.task_delete_empty'
 )
 queue_indexing.add_task_type(
-    name='mayan.apps.document_indexing.tasks.task_remove_document',
-    label=_('Remove document')
+    label=_('Remove document'),
+    name='mayan.apps.document_indexing.tasks.task_remove_document'
 )
 queue_indexing.add_task_type(
-    name='mayan.apps.document_indexing.tasks.task_index_document',
-    label=_('Index document')
+    label=_('Index document'),
+    name='mayan.apps.document_indexing.tasks.task_index_document'
 )
 queue_tools.add_task_type(
-    name='mayan.apps.document_indexing.tasks.task_rebuild_index',
-    label=_('Rebuild index')
+    label=_('Rebuild index'),
+    name='mayan.apps.document_indexing.tasks.task_rebuild_index'
 )
diff --git a/mayan/apps/document_indexing/views.py b/mayan/apps/document_indexing/views.py
index 0e7c07487e..ab185879a7 100644
--- a/mayan/apps/document_indexing/views.py
+++ b/mayan/apps/document_indexing/views.py
@@ -46,10 +46,10 @@ class SetupIndexCreateView(SingleObjectCreateView):
 
 class SetupIndexDeleteView(SingleObjectDeleteView):
     model = Index
+    object_permission = permission_document_indexing_delete
     post_action_redirect = reverse_lazy(
         viewname='indexing:index_setup_list'
     )
-    object_permission = permission_document_indexing_delete
 
     def get_extra_context(self):
         return {
@@ -61,10 +61,10 @@ class SetupIndexDeleteView(SingleObjectDeleteView):
 class SetupIndexEditView(SingleObjectEditView):
     fields = ('label', 'slug', 'enabled')
     model = Index
+    object_permission = permission_document_indexing_edit
     post_action_redirect = reverse_lazy(
         viewname='indexing:index_setup_list'
     )
-    object_permission = permission_document_indexing_edit
 
     def get_extra_context(self):
         return {
@@ -106,8 +106,9 @@ class SetupIndexDocumentTypesView(AssignRemoveView):
 
     def get_document_queryset(self):
         return AccessControlList.objects.filter_by_access(
-            permission_document_view, self.request.user,
-            queryset=DocumentType.objects.all()
+            permission=permission_document_view,
+            queryset=DocumentType.objects.all(),
+            user=self.request.user
         )
 
     def get_extra_context(self):
@@ -168,8 +169,8 @@ class TemplateNodeCreateView(SingleObjectCreateView):
 
     def dispatch(self, request, *args, **kwargs):
         AccessControlList.objects.check_access(
-            permissions=permission_document_indexing_edit, user=request.user,
-            obj=self.get_parent_node().index
+            obj=self.get_parent_node().index,
+            permissions=permission_document_indexing_edit, user=request.user
         )
 
         return super(
@@ -261,7 +262,9 @@ class IndexListView(SingleObjectListView):
 
     def get_object_list(self):
         queryset = IndexInstance.objects.filter(enabled=True)
-        return queryset.filter(node_templates__index_instance_nodes__isnull=False).distinct()
+        return queryset.filter(
+            node_templates__index_instance_nodes__isnull=False
+        ).distinct()
 
 
 class IndexInstanceNodeView(DocumentListView):
@@ -273,8 +276,9 @@ class IndexInstanceNodeView(DocumentListView):
         )
 
         AccessControlList.objects.check_access(
+            obj=self.index_instance_node.index(),
             permissions=permission_document_indexing_instance_view,
-            user=request.user, obj=self.index_instance_node.index()
+            user=request.user
         )
 
         if self.index_instance_node:
@@ -340,8 +344,8 @@ class DocumentIndexNodeListView(SingleObjectListView):
 
     def dispatch(self, request, *args, **kwargs):
         AccessControlList.objects.check_access(
-            permissions=permission_document_view, user=request.user,
-            obj=self.get_document()
+            obj=self.get_document(), permissions=permission_document_view,
+            user=request.user
         )
 
         return super(
diff --git a/mayan/apps/document_parsing/apps.py b/mayan/apps/document_parsing/apps.py
index fb81906fa6..4ef5e4467d 100644
--- a/mayan/apps/document_parsing/apps.py
+++ b/mayan/apps/document_parsing/apps.py
@@ -88,7 +88,7 @@ class DocumentParsingApp(MayanAppConfig):
         )
 
         ModelField(
-            Document, name='versions__pages__content__content'
+            model=Document, name='versions__pages__content__content'
         )
 
         ModelPermission.register(
@@ -107,8 +107,8 @@ class DocumentParsingApp(MayanAppConfig):
 
         SourceColumn(
             attribute='document_version__document',
-            is_attribute_absolute_url=True, is_identifier=True, is_sortable=True,
-            source=DocumentVersionParseError
+            is_attribute_absolute_url=True, is_identifier=True,
+            is_sortable=True, source=DocumentVersionParseError
         )
         SourceColumn(
             attribute='datetime_submitted', is_sortable=True,
diff --git a/mayan/apps/document_parsing/parsers.py b/mayan/apps/document_parsing/parsers.py
index 7b64f886d5..2ffd900a44 100644
--- a/mayan/apps/document_parsing/parsers.py
+++ b/mayan/apps/document_parsing/parsers.py
@@ -23,12 +23,18 @@ class Parser(object):
     _registry = {}
 
     @classmethod
-    def register(cls, mimetypes, parser_classes):
-        for mimetype in mimetypes:
-            for parser_class in parser_classes:
-                cls._registry.setdefault(
-                    mimetype, []
-                ).append(parser_class)
+    def parse_document_page(cls, document_page):
+        for parser_class in cls._registry.get(document_page.document_version.mimetype, ()):
+            try:
+                parser = parser_class()
+                parser.process_document_page(document_page)
+            except ParserError:
+                # If parser raises error, try next parser in the list
+                pass
+            else:
+                # If parser was successfull there is no need to try
+                # others in the list for this mimetype
+                return
 
     @classmethod
     def parse_document_version(cls, document_version):
@@ -45,18 +51,12 @@ class Parser(object):
                 return
 
     @classmethod
-    def parse_document_page(cls, document_page):
-        for parser_class in cls._registry.get(document_page.document_version.mimetype, ()):
-            try:
-                parser = parser_class()
-                parser.process_document_page(document_page)
-            except ParserError:
-                # If parser raises error, try next parser in the list
-                pass
-            else:
-                # If parser was successfull there is no need to try
-                # others in the list for this mimetype
-                return
+    def register(cls, mimetypes, parser_classes):
+        for mimetype in mimetypes:
+            for parser_class in parser_classes:
+                cls._registry.setdefault(
+                    mimetype, []
+                ).append(parser_class)
 
     def process_document_version(self, document_version):
         logger.info(
diff --git a/mayan/apps/document_parsing/permissions.py b/mayan/apps/document_parsing/permissions.py
index 3031daac19..053ec933f5 100644
--- a/mayan/apps/document_parsing/permissions.py
+++ b/mayan/apps/document_parsing/permissions.py
@@ -5,16 +5,16 @@ from django.utils.translation import ugettext_lazy as _
 from mayan.apps.permissions import PermissionNamespace
 
 namespace = PermissionNamespace(
-    name='document_parsing', label=_('Document parsing')
+    label=_('Document parsing'), name='document_parsing'
 )
 
 permission_content_view = namespace.add_permission(
-    name='content_view', label=_('View the content of a document')
+    label=_('View the content of a document'), name='content_view'
 )
 permission_document_type_parsing_setup = namespace.add_permission(
-    name='document_type_setup',
-    label=_('Change document type parsing settings')
+    label=_('Change document type parsing settings'),
+    name='document_type_setup'
 )
 permission_parse_document = namespace.add_permission(
-    name='parse_document', label=_('Parse the content of a document')
+    label=_('Parse the content of a document'), name='parse_document'
 )
diff --git a/mayan/apps/document_parsing/settings.py b/mayan/apps/document_parsing/settings.py
index 1e9dd9f368..c6626fbbd1 100644
--- a/mayan/apps/document_parsing/settings.py
+++ b/mayan/apps/document_parsing/settings.py
@@ -4,7 +4,7 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.smart_settings import Namespace
 
-namespace = Namespace(name='document_parsing', label=_('Document parsing'))
+namespace = Namespace(label=_('Document parsing'), name='document_parsing')
 
 setting_auto_parsing = namespace.add_setting(
     global_name='DOCUMENT_PARSING_AUTO_PARSING', default=True,
diff --git a/mayan/apps/document_parsing/views.py b/mayan/apps/document_parsing/views.py
index a81811df81..67baeb71e4 100644
--- a/mayan/apps/document_parsing/views.py
+++ b/mayan/apps/document_parsing/views.py
@@ -178,14 +178,14 @@ class DocumentTypeSubmitView(FormView):
                 count += 1
 
         messages.success(
-            self.request, _(
+            message=_(
                 '%(count)d documents added to the parsing queue.'
             ) % {
                 'count': count,
-            }
+            }, requrest=self.request
         )
 
-        return HttpResponseRedirect(self.get_success_url())
+        return HttpResponseRedirect(redirect_to=self.get_success_url())
 
 
 class ParseErrorListView(SingleObjectListView):
diff --git a/mayan/apps/document_signatures/apps.py b/mayan/apps/document_signatures/apps.py
index af62bf1784..aecd132358 100644
--- a/mayan/apps/document_signatures/apps.py
+++ b/mayan/apps/document_signatures/apps.py
@@ -16,7 +16,9 @@ from mayan.apps.common.menus import (
 from mayan.apps.navigation import SourceColumn
 from mayan.celery import app
 
-from .handlers import unverify_key_signatures, verify_key_signatures
+from .handlers import (
+    handler_unverify_key_signatures, handler_verify_key_signatures
+)
 from .links import (
     link_document_version_all_signature_verify,
     link_document_signature_list,
@@ -63,9 +65,9 @@ class DocumentSignaturesApp(MayanAppConfig):
             app_label='django_gpg', model_name='Key'
         )
 
-        EmbeddedSignature = self.get_model('EmbeddedSignature')
+        EmbeddedSignature = self.get_model(model_name='EmbeddedSignature')
 
-        SignatureBaseModel = self.get_model('SignatureBaseModel')
+        SignatureBaseModel = self.get_model(model_name='SignatureBaseModel')
 
         DocumentVersion.register_post_save_hook(
             order=1, func=EmbeddedSignature.objects.create
@@ -111,10 +113,10 @@ class DocumentSignaturesApp(MayanAppConfig):
 
         app.conf.CELERY_ROUTES.update(
             {
-                'mayan.apps.document_signatures.tasks.task_verify_key_signatures': {
+                'mayan.apps.document_signatures.tasks.task_handler_verify_key_signatures': {
                     'queue': 'signatures'
                 },
-                'mayan.apps.document_signatures.tasks.task_unverify_key_signatures': {
+                'mayan.apps.document_signatures.tasks.task_handler_unhandler_verify_key_signatures': {
                     'queue': 'signatures'
                 },
                 'mayan.apps.document_signatures.tasks.task_verify_document_version': {
@@ -158,12 +160,12 @@ class DocumentSignaturesApp(MayanAppConfig):
         )
 
         post_delete.connect(
-            unverify_key_signatures,
-            dispatch_uid='unverify_key_signatures',
+            dispatch_uid='signatures_handler_unverify_key_signatures',
+            receiver=handler_unverify_key_signatures,
             sender=Key
         )
         post_save.connect(
-            verify_key_signatures,
-            dispatch_uid='verify_key_signatures',
+            dispatch_uid='signatures_handler_verify_key_signatures',
+            receiver=handler_verify_key_signatures,
             sender=Key
         )
diff --git a/mayan/apps/document_signatures/handlers.py b/mayan/apps/document_signatures/handlers.py
index 988f4da513..f55d7de538 100644
--- a/mayan/apps/document_signatures/handlers.py
+++ b/mayan/apps/document_signatures/handlers.py
@@ -1,22 +1,23 @@
 from __future__ import unicode_literals
 
 from .tasks import (
-    task_unverify_key_signatures, task_verify_missing_embedded_signature,
+    task_unverify_key_signatures,
+    task_verify_missing_embedded_signature,
     task_verify_key_signatures
 )
 
 
-def unverify_key_signatures(sender, **kwargs):
+def handler_verify_missing_embedded_signature(sender, **kwargs):
+    task_verify_missing_embedded_signature.delay()
+
+
+def handler_unverify_key_signatures(sender, **kwargs):
     task_unverify_key_signatures.apply_async(
         kwargs=dict(key_id=kwargs['instance'].key_id)
     )
 
 
-def verify_key_signatures(sender, **kwargs):
+def handler_verify_key_signatures(sender, **kwargs):
     task_verify_key_signatures.apply_async(
         kwargs=dict(key_pk=kwargs['instance'].pk)
     )
-
-
-def verify_missing_embedded_signature(sender, **kwargs):
-    task_verify_missing_embedded_signature.delay()
diff --git a/mayan/apps/document_signatures/models.py b/mayan/apps/document_signatures/models.py
index 47e226f5ed..524fb893ee 100644
--- a/mayan/apps/document_signatures/models.py
+++ b/mayan/apps/document_signatures/models.py
@@ -65,8 +65,8 @@ class SignatureBaseModel(models.Model):
 
     def get_absolute_url(self):
         return reverse(
-            'document_signatures:document_version_signature_detail',
-            args=(self.pk,)
+            viewname='document_signatures:document_version_signature_detail',
+            kwargs={'pk': self.pk}
         )
 
     def get_key_id(self):
@@ -98,7 +98,7 @@ class EmbeddedSignature(SignatureBaseModel):
         verbose_name_plural = _('Document version embedded signatures')
 
     def save(self, *args, **kwargs):
-        logger.debug('checking for embedded signature')
+        logger.debug(msg='checking for embedded signature')
 
         if self.pk:
             raw = True
diff --git a/mayan/apps/document_signatures/permissions.py b/mayan/apps/document_signatures/permissions.py
index d570776a0a..c225acb170 100644
--- a/mayan/apps/document_signatures/permissions.py
+++ b/mayan/apps/document_signatures/permissions.py
@@ -5,34 +5,34 @@ from django.utils.translation import ugettext_lazy as _
 from mayan.apps.permissions import PermissionNamespace
 
 namespace = PermissionNamespace(
-    name='document_signatures', label=_('Document signatures')
+    label=_('Document signatures'), name='document_signatures'
 )
 
 permission_document_version_sign_detached = namespace.add_permission(
-    name='document_version_sign_detached',
-    label=_('Sign documents with detached signatures')
+    label=_('Sign documents with detached signatures'),
+    name='document_version_sign_detached'
 )
 permission_document_version_sign_embedded = namespace.add_permission(
-    name='document_version_sign_embedded',
-    label=_('Sign documents with embedded signatures')
+    label=_('Sign documents with embedded signatures'),
+    name='document_version_sign_embedded'
 )
 permission_document_version_signature_delete = namespace.add_permission(
-    name='document_version_signature_delete',
-    label=_('Delete detached signatures')
+    label=_('Delete detached signatures'),
+    name='document_version_signature_delete'
 )
 permission_document_version_signature_download = namespace.add_permission(
-    name='document_version_signature_download',
-    label=_('Download detached document signatures')
+    label=_('Download detached document signatures'),
+    name='document_version_signature_download'
 )
 permission_document_version_signature_upload = namespace.add_permission(
-    name='document_version_signature_upload',
-    label=_('Upload detached document signatures')
+    label=_('Upload detached document signatures'),
+    name='document_version_signature_upload'
 )
 permission_document_version_signature_verify = namespace.add_permission(
-    name='document_version_signature_verify',
-    label=_('Verify document signatures')
+    label=_('Verify document signatures'),
+    name='document_version_signature_verify'
 )
 permission_document_version_signature_view = namespace.add_permission(
-    name='document_version_signature_view',
-    label=_('View details of document signatures')
+    label=_('View details of document signatures'),
+    name='document_version_signature_view'
 )
diff --git a/mayan/apps/document_signatures/queues.py b/mayan/apps/document_signatures/queues.py
index 50f431d401..a10d60caac 100644
--- a/mayan/apps/document_signatures/queues.py
+++ b/mayan/apps/document_signatures/queues.py
@@ -5,21 +5,22 @@ from django.utils.translation import ugettext_lazy as _
 from mayan.apps.common.queues import queue_tools
 from mayan.apps.task_manager.classes import CeleryQueue
 
-queue_signatures = CeleryQueue(name='signatures', label=_('Signatures'))
+queue_signatures = CeleryQueue(label=_('Signatures'), name='signatures')
+
 queue_signatures.add_task_type(
-    name='mayan.apps.document_signatures.tasks.task_verify_key_signatures',
-    label=_('Verify key signatures')
+    label=_('Verify key signatures'),
+    name='mayan.apps.document_signatures.tasks.task_verify_key_signatures'
 )
 queue_signatures.add_task_type(
-    name='mayan.apps.document_signatures.tasks.task_unverify_key_signatures',
-    label=_('Unverify key signatures')
+    label=_('Unverify key signatures'),
+    name='mayan.apps.document_signatures.tasks.task_unverify_key_signatures'
 )
 queue_signatures.add_task_type(
-    name='mayan.apps.document_signatures.tasks.task_verify_document_version',
-    label=_('Verify document version')
+    label=_('Verify document version'),
+    name='mayan.apps.document_signatures.tasks.task_verify_document_version'
 )
 
 queue_tools.add_task_type(
-    name='mayan.apps.document_signatures.tasks.task_verify_missing_embedded_signature',
-    label=_('Verify missing embedded signature')
+    label=_('Verify missing embedded signature'),
+    name='mayan.apps.document_signatures.tasks.task_verify_missing_embedded_signature'
 )
diff --git a/mayan/apps/document_signatures/settings.py b/mayan/apps/document_signatures/settings.py
index 3c61f5a916..6e0b75ec23 100644
--- a/mayan/apps/document_signatures/settings.py
+++ b/mayan/apps/document_signatures/settings.py
@@ -7,7 +7,8 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.smart_settings import Namespace
 
-namespace = Namespace(name='signatures', label=_('Document signatures'))
+namespace = Namespace(label=_('Document signatures'), name='signatures')
+
 setting_storage_backend = namespace.add_setting(
     default='django.core.files.storage.FileSystemStorage',
     global_name='SIGNATURES_STORAGE_BACKEND', help_text=_(
diff --git a/mayan/apps/document_signatures/views.py b/mayan/apps/document_signatures/views.py
index 47dfab001a..5500b0fa4e 100644
--- a/mayan/apps/document_signatures/views.py
+++ b/mayan/apps/document_signatures/views.py
@@ -69,7 +69,7 @@ class DocumentVersionDetachedSignatureCreateView(FormView):
                 request=self.request
             )
             return HttpResponseRedirect(
-                reverse(
+                redirect_to=reverse(
                     viewname='signatures:document_version_signature_detached_create',
                     kwargs={'pk': self.get_document_version().pk}
                 )
@@ -80,7 +80,7 @@ class DocumentVersionDetachedSignatureCreateView(FormView):
                 request=self.request
             )
             return HttpResponseRedirect(
-                reverse(
+                redirect_to=reverse(
                     viewname='signatures:document_version_signature_detached_create',
                     kwargs={'pk': self.get_document_version().pk}
                 )
@@ -108,8 +108,9 @@ class DocumentVersionDetachedSignatureCreateView(FormView):
 
     def dispatch(self, request, *args, **kwargs):
         AccessControlList.objects.check_access(
+            obj=self.get_document_version().document,
             permissions=permission_document_version_sign_detached,
-            user=request.user, obj=self.get_document_version().document
+            user=request.user
         )
 
         return super(
@@ -145,7 +146,7 @@ class DocumentVersionEmbeddedSignatureCreateView(FormView):
         passphrase = form.cleaned_data['passphrase'] or None
 
         AccessControlList.objects.check_access(
-            permissions=permission_key_sign, user=self.request.user, obj=key
+            obj=key, permissions=permission_key_sign, user=self.request.user
         )
 
         try:
@@ -159,7 +160,7 @@ class DocumentVersionEmbeddedSignatureCreateView(FormView):
                 request=self.request
             )
             return HttpResponseRedirect(
-                reverse(
+                redirect_to=reverse(
                     viewname='signatures:document_version_signature_embedded_create',
                     kwargs={'pk': self.get_document_version().pk}
                 )
@@ -170,7 +171,7 @@ class DocumentVersionEmbeddedSignatureCreateView(FormView):
                 request=self.request
             )
             return HttpResponseRedirect(
-                reverse(
+                redirect_to=reverse(
                     viewname='signatures:document_version_signature_embedded_create',
                     kwargs={'pk': self.get_document_version().pk}
                 )
@@ -192,7 +193,7 @@ class DocumentVersionEmbeddedSignatureCreateView(FormView):
             )
 
             return HttpResponseRedirect(
-                reverse(
+                redirect_to=reverse(
                     viewname='signatures:document_version_signature_list',
                     kwargs={'pk': new_version.pk}
                 )
@@ -204,8 +205,9 @@ class DocumentVersionEmbeddedSignatureCreateView(FormView):
 
     def dispatch(self, request, *args, **kwargs):
         AccessControlList.objects.check_access(
+            obj=self.get_document_version().document,
             permissions=permission_document_version_sign_embedded,
-            user=request.user, obj=self.get_document_version().document
+            user=request.user
         )
 
         return super(
@@ -336,8 +338,9 @@ class DocumentVersionSignatureUploadView(SingleObjectCreateView):
 
     def dispatch(self, request, *args, **kwargs):
         AccessControlList.objects.check_access(
+            obj=self.get_document_version(),
             permissions=permission_document_version_signature_upload,
-            user=request.user, obj=self.get_document_version()
+            user=request.user
         )
 
         return super(
diff --git a/mayan/apps/documents/apps.py b/mayan/apps/documents/apps.py
index ad684e2d18..81f4d365e1 100644
--- a/mayan/apps/documents/apps.py
+++ b/mayan/apps/documents/apps.py
@@ -48,7 +48,7 @@ from .events import (
     event_document_view
 )
 from .handlers import (
-    create_default_document_type, handler_remove_empty_duplicates_lists,
+    handler_create_default_document_type, handler_remove_empty_duplicates_lists,
     handler_scan_duplicates_for,
 )
 from .links import (
@@ -121,14 +121,14 @@ class DocumentsApp(MayanAppConfig):
         super(DocumentsApp, self).ready()
         from actstream import registry
 
-        DeletedDocument = self.get_model('DeletedDocument')
-        Document = self.get_model('Document')
-        DocumentPage = self.get_model('DocumentPage')
-        DocumentPageResult = self.get_model('DocumentPageResult')
-        DocumentType = self.get_model('DocumentType')
-        DocumentTypeFilename = self.get_model('DocumentTypeFilename')
-        DocumentVersion = self.get_model('DocumentVersion')
-        DuplicatedDocument = self.get_model('DuplicatedDocument')
+        DeletedDocument = self.get_model(model_name='DeletedDocument')
+        Document = self.get_model(model_name='Document')
+        DocumentPage = self.get_model(model_name='DocumentPage')
+        DocumentPageResult = self.get_model(model_name='DocumentPageResult')
+        DocumentType = self.get_model(model_name='DocumentType')
+        DocumentTypeFilename = self.get_model(model_name='DocumentTypeFilename')
+        DocumentVersion = self.get_model(model_name='DocumentVersion')
+        DuplicatedDocument = self.get_model(model_name='DuplicatedDocument')
 
         DynamicSerializerField.add_serializer(
             klass=Document,
@@ -144,29 +144,33 @@ class DocumentsApp(MayanAppConfig):
             view='documents:document_type_list'
         )
 
-        ModelField(Document, name='description')
-        ModelField(Document, name='date_added')
-        ModelField(Document, name='deleted_date_time')
-        ModelField(Document, name='document_type__label')
-        ModelField(Document, name='in_trash')
-        ModelField(Document, name='is_stub')
-        ModelField(Document, name='label')
-        ModelField(Document, name='language')
-        ModelField(Document, name='uuid')
+        ModelField(model=Document, name='description')
+        ModelField(model=Document, name='date_added')
+        ModelField(model=Document, name='deleted_date_time')
+        ModelField(model=Document, name='document_type__label')
+        ModelField(model=Document, name='in_trash')
+        ModelField(model=Document, name='is_stub')
+        ModelField(model=Document, name='label')
+        ModelField(model=Document, name='language')
+        ModelField(model=Document, name='uuid')
         ModelField(
-            Document, name='versions__checksum'
+            model=Document, name='versions__checksum'
         )
         ModelField(
-            Document, label=_('Versions comment'), name='versions__comment'
+            model=Document, label=_('Versions comment'),
+            name='versions__comment'
         )
         ModelField(
-            Document, label=_('Versions encoding'), name='versions__encoding'
+            model=Document, label=_('Versions encoding'),
+            name='versions__encoding'
         )
         ModelField(
-            Document, label=_('Versions mime type'), name='versions__mimetype'
+            model=Document, label=_('Versions mime type'),
+            name='versions__mimetype'
         )
         ModelField(
-            Document, label=_('Versions timestamp'), name='versions__timestamp'
+            model=Document, label=_('Versions timestamp'),
+            name='versions__timestamp'
         )
 
         ModelEventType.register(
@@ -245,19 +249,17 @@ class DocumentsApp(MayanAppConfig):
             is_sortable=True, source=Document
         )
         SourceColumn(
-            source=Document, label=_('Thumbnail'),
             func=lambda context: document_page_thumbnail_widget.render(
                 instance=context['object']
-            )
+            ), label=_('Thumbnail'), source=Document
         )
         SourceColumn(
             attribute='document_type', is_sortable=True, source=Document,
         )
         SourceColumn(
-            source=Document, label=_('Pages'),
             func=lambda context: widget_document_page_number(
                 document=context['object']
-            )
+            ), label=_('Pages'), source=Document
         )
         SourceColumn(
             attribute='date_added', include_label=True, is_sortable=True,
@@ -272,22 +274,20 @@ class DocumentsApp(MayanAppConfig):
 
         # DocumentPage
         SourceColumn(
-            source=DocumentPage, label=_('Thumbnail'),
             func=lambda context: document_page_thumbnail_widget.render(
                 instance=context['object']
-            )
+            ), label=_('Thumbnail'), source=DocumentPage
         )
 
         SourceColumn(
-            source=DocumentPageResult, label=_('Thumbnail'),
             func=lambda context: document_page_thumbnail_widget.render(
                 instance=context['object']
-            )
+            ), label=_('Thumbnail'), source=DocumentPageResult
         )
 
         SourceColumn(
-            source=DocumentPageResult, label=_('Type'),
-            attribute='document_version.document.document_type'
+            attribute='document_version.document.document_type',
+            label=_('Type'), source=DocumentPageResult
         )
 
         # DocumentType
@@ -297,10 +297,9 @@ class DocumentsApp(MayanAppConfig):
         )
 
         SourceColumn(
-            source=DocumentType, label=_('Documents'),
             func=lambda context: context['object'].get_document_count(
                 user=context['request'].user
-            )
+            ), label=_('Documents'), source=DocumentType
         )
 
         SourceColumn(
@@ -318,16 +317,15 @@ class DocumentsApp(MayanAppConfig):
             source=DeletedDocument
         )
         SourceColumn(
-            source=DeletedDocument, label=_('Thumbnail'),
             func=lambda context: document_page_thumbnail_widget.render(
                 instance=context['object']
-            )
+            ), label=_('Thumbnail'), source=DeletedDocument
         )
         SourceColumn(
             attribute='document_type', is_sortable=True, source=DeletedDocument
         )
         SourceColumn(
-            source=DeletedDocument, attribute='deleted_date_time'
+            attribute='deleted_date_time', source=DeletedDocument
         )
 
         # DocumentVersion
@@ -336,16 +334,14 @@ class DocumentsApp(MayanAppConfig):
             is_object_absolute_url=True
         )
         SourceColumn(
-            source=DocumentVersion, label=_('Thumbnail'),
             func=lambda context: document_page_thumbnail_widget.render(
                 instance=context['object']
-            )
+            ), label=_('Thumbnail'), source=DocumentVersion
         )
         SourceColumn(
-            source=DocumentVersion, label=_('Pages'),
             func=lambda context: widget_document_version_page_number(
                 document_version=context['object']
-            )
+            ), label=_('Pages'), source=DocumentVersion
         )
         SourceColumn(
             attribute='mimetype', is_sortable=True, source=DocumentVersion
@@ -611,15 +607,15 @@ class DocumentsApp(MayanAppConfig):
         post_delete.connect(
             dispatch_uid='handler_remove_empty_duplicates_lists',
             receiver=handler_remove_empty_duplicates_lists,
-            sender=Document,
+            sender=Document
         )
         post_initial_setup.connect(
-            create_default_document_type,
-            dispatch_uid='create_default_document_type'
+            dispatch_uid='handler_create_default_document_type',
+            receiver=handler_create_default_document_type
         )
         post_version_upload.connect(
-            handler_scan_duplicates_for,
             dispatch_uid='handler_scan_duplicates_for',
+            receiver=handler_scan_duplicates_for
         )
 
         registry.register(DeletedDocument)
diff --git a/mayan/apps/documents/dashboard_widgets.py b/mayan/apps/documents/dashboard_widgets.py
index 244a44fa2d..518c3b4acb 100644
--- a/mayan/apps/documents/dashboard_widgets.py
+++ b/mayan/apps/documents/dashboard_widgets.py
@@ -23,7 +23,7 @@ class DashboardWidgetDocumentPagesTotal(DashboardWidgetNumeric):
     icon_class = icon_dashboard_pages_per_month
     label = _('Total pages')
     link = reverse_lazy(
-        'statistics:statistic_detail',
+        viewname='statistics:statistic_detail',
         args=('total-document-pages-at-each-month',)
     )
 
diff --git a/mayan/apps/documents/events.py b/mayan/apps/documents/events.py
index 817970f27d..b841730d62 100644
--- a/mayan/apps/documents/events.py
+++ b/mayan/apps/documents/events.py
@@ -4,35 +4,35 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.events import EventTypeNamespace
 
-namespace = EventTypeNamespace(name='documents', label=_('Documents'))
+namespace = EventTypeNamespace(label=_('Documents'), name='documents')
 
 event_document_create = namespace.add_event_type(
-    name='document_create', label=_('Document created')
+    label=_('Document created'), name='document_create'
 )
 event_document_download = namespace.add_event_type(
-    name='document_download', label=_('Document downloaded')
+    label=_('Document downloaded'), name='document_download'
 )
 event_document_new_version = namespace.add_event_type(
-    name='document_new_version', label=_('New version uploaded')
+    label=_('New version uploaded'), name='document_new_version'
 )
 event_document_properties_edit = namespace.add_event_type(
-    name='document_edit', label=_('Document properties edited')
+    label=_('Document properties edited'), name='document_edit'
 )
 # The type of an existing document is changed to another type
 event_document_type_change = namespace.add_event_type(
-    name='document_type_change', label=_('Document type changed')
+    label=_('Document type changed'), name='document_type_change'
 )
 # A document type is created
 event_document_type_created = namespace.add_event_type(
-    name='document_type_created', label=_('Document type created')
+    label=_('Document type created'), name='document_type_created'
 )
 # An existing document type is modified
 event_document_type_edited = namespace.add_event_type(
-    name='document_type_edit', label=_('Document type edited')
+    label=_('Document type edited'), name='document_type_edit'
 )
 event_document_version_revert = namespace.add_event_type(
-    name='document_version_revert', label=_('Document version reverted')
+    label=_('Document version reverted'), name='document_version_revert'
 )
 event_document_view = namespace.add_event_type(
-    name='document_view', label=_('Document viewed')
+    label=_('Document viewed'), name='document_view'
 )
diff --git a/mayan/apps/documents/handlers.py b/mayan/apps/documents/handlers.py
index 62fa444a0e..597a38c40d 100644
--- a/mayan/apps/documents/handlers.py
+++ b/mayan/apps/documents/handlers.py
@@ -7,7 +7,7 @@ from .signals import post_initial_document_type
 from .tasks import task_clean_empty_duplicate_lists, task_scan_duplicates_for
 
 
-def create_default_document_type(sender, **kwargs):
+def handler_create_default_document_type(sender, **kwargs):
     DocumentType = apps.get_model(
         app_label='documents', model_name='DocumentType'
     )
diff --git a/mayan/apps/documents/managers.py b/mayan/apps/documents/managers.py
index f26dd5fff0..b047b9d5e9 100644
--- a/mayan/apps/documents/managers.py
+++ b/mayan/apps/documents/managers.py
@@ -60,7 +60,7 @@ class DocumentPageManager(models.Manager):
 
 class DocumentTypeManager(models.Manager):
     def check_delete_periods(self):
-        logger.info('Executing')
+        logger.info(msg='Executing')
 
         for document_type in self.all():
             logger.info(
@@ -88,10 +88,10 @@ class DocumentTypeManager(models.Manager):
                     'Document type: %s, has a no retention delta', document_type
                 )
 
-        logger.info('Finshed')
+        logger.info(msg='Finshed')
 
     def check_trash_periods(self):
-        logger.info('Executing')
+        logger.info(msg='Executing')
 
         for document_type in self.all():
             logger.info(
@@ -119,7 +119,7 @@ class DocumentTypeManager(models.Manager):
                     'Document type: %s, has a no retention delta', document_type
                 )
 
-        logger.info('Finshed')
+        logger.info(msg='Finshed')
 
     def get_by_natural_key(self, label):
         return self.get(label=label)
diff --git a/mayan/apps/documents/models/document_page_models.py b/mayan/apps/documents/models/document_page_models.py
index 75a3452311..4c6f42fdd6 100644
--- a/mayan/apps/documents/models/document_page_models.py
+++ b/mayan/apps/documents/models/document_page_models.py
@@ -1,8 +1,6 @@
 from __future__ import absolute_import, unicode_literals
 
-import hashlib
 import logging
-import uuid
 
 from furl import furl
 
@@ -33,15 +31,6 @@ __all__ = ('DocumentPage', 'DocumentPageCachedImage', 'DocumentPageResult')
 logger = logging.getLogger(__name__)
 
 
-# document image cache name hash function
-def hash_function():
-    return hashlib.sha256()
-
-
-def UUID_FUNCTION(*args, **kwargs):
-    return force_text(uuid.uuid4())
-
-
 @python_2_unicode_compatible
 class DocumentPage(models.Model):
     """
diff --git a/mayan/apps/documents/models/document_type_models.py b/mayan/apps/documents/models/document_type_models.py
index 1c07146f75..877567edee 100644
--- a/mayan/apps/documents/models/document_type_models.py
+++ b/mayan/apps/documents/models/document_type_models.py
@@ -1,13 +1,11 @@
 from __future__ import absolute_import, unicode_literals
 
-import hashlib
 import logging
-import uuid
 
 from django.apps import apps
 from django.db import models, transaction
 from django.urls import reverse
-from django.utils.encoding import force_text, python_2_unicode_compatible
+from django.utils.encoding import python_2_unicode_compatible
 from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.acls.models import AccessControlList
@@ -23,15 +21,6 @@ __all__ = ('DocumentType', 'DocumentTypeFilename')
 logger = logging.getLogger(__name__)
 
 
-# document image cache name hash function
-def hash_function():
-    return hashlib.sha256()
-
-
-def UUID_FUNCTION(*args, **kwargs):
-    return force_text(uuid.uuid4())
-
-
 @python_2_unicode_compatible
 class DocumentType(models.Model):
     """
diff --git a/mayan/apps/documents/models/misc_models.py b/mayan/apps/documents/models/misc_models.py
index 922bfa1c96..67db70769f 100644
--- a/mayan/apps/documents/models/misc_models.py
+++ b/mayan/apps/documents/models/misc_models.py
@@ -1,8 +1,6 @@
 from __future__ import absolute_import, unicode_literals
 
-import hashlib
 import logging
-import uuid
 
 from django.conf import settings
 from django.db import models
@@ -23,15 +21,6 @@ __all__ = (
 logger = logging.getLogger(__name__)
 
 
-# document image cache name hash function
-def hash_function():
-    return hashlib.sha256()
-
-
-def UUID_FUNCTION(*args, **kwargs):
-    return force_text(uuid.uuid4())
-
-
 class DeletedDocument(Document):
     objects = TrashCanManager()
 
diff --git a/mayan/apps/documents/permissions.py b/mayan/apps/documents/permissions.py
index 0d7ecfdae6..5abcbb9176 100644
--- a/mayan/apps/documents/permissions.py
+++ b/mayan/apps/documents/permissions.py
@@ -4,65 +4,66 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.permissions import PermissionNamespace
 
-namespace = PermissionNamespace(name='documents', label=_('Documents'))
+namespace = PermissionNamespace(label=_('Documents'), name='documents')
 
 permission_document_create = namespace.add_permission(
-    name='document_create', label=_('Create documents')
+    label=_('Create documents'), name='document_create'
 )
 permission_document_delete = namespace.add_permission(
-    name='document_delete', label=_('Delete documents')
+    label=_('Delete documents'), name='document_delete'
 )
 permission_document_trash = namespace.add_permission(
-    name='document_trash', label=_('Trash documents')
+    label=_('Trash documents'), name='document_trash'
 )
 permission_document_download = namespace.add_permission(
-    name='document_download', label=_('Download documents')
+    label=_('Download documents'), name='document_download'
 )
 permission_document_edit = namespace.add_permission(
-    name='document_edit', label=_('Edit documents')
+    label=_('Edit documents'), name='document_edit'
 )
 permission_document_new_version = namespace.add_permission(
-    name='document_new_version', label=_('Create new document versions')
+    label=_('Create new document versions'), name='document_new_version'
 )
 permission_document_properties_edit = namespace.add_permission(
-    name='document_properties_edit', label=_('Edit document properties')
+    label=_('Edit document properties'), name='document_properties_edit'
 )
 permission_document_print = namespace.add_permission(
-    name='document_print', label=_('Print documents')
+    label=_('Print documents'), name='document_print'
 )
 permission_document_restore = namespace.add_permission(
-    name='document_restore', label=_('Restore trashed document')
+    label=_('Restore trashed document'), name='document_restore'
 )
 permission_document_tools = namespace.add_permission(
-    name='document_tools', label=_('Execute document modifying tools')
+    label=_('Execute document modifying tools'), name='document_tools'
 )
 permission_document_version_revert = namespace.add_permission(
-    name='document_version_revert',
-    label=_('Revert documents to a previous version')
+    label=_('Revert documents to a previous version'),
+    name='document_version_revert'
 )
 permission_document_version_view = namespace.add_permission(
-    name='document_version_view',
-    label=_('View documents\' versions list')
+    label=_('View documents\' versions list'),
+    name='document_version_view'
 )
 permission_document_view = namespace.add_permission(
-    name='document_view', label=_('View documents')
+    label=_('View documents'), name='document_view'
 )
 permission_empty_trash = namespace.add_permission(
-    name='document_empty_trash', label=_('Empty trash')
+    label=_('Empty trash'), name='document_empty_trash'
 )
 
 setup_namespace = PermissionNamespace(
-    name='documents_types', label=_('Document types')
+    label=_('Document types'), name='documents_types'
 )
+
 permission_document_type_create = setup_namespace.add_permission(
-    name='document_type_create', label=_('Create document types')
+    label=_('Create document types'), name='document_type_create'
 )
 permission_document_type_delete = setup_namespace.add_permission(
-    name='document_type_delete', label=_('Delete document types')
+    label=_('Delete document types'), name='document_type_delete'
 )
 permission_document_type_edit = setup_namespace.add_permission(
-    name='document_type_edit', label=_('Edit document types')
+    label=_('Edit document types'), name='document_type_edit'
 )
 permission_document_type_view = setup_namespace.add_permission(
-    name='document_type_view', label=_('View document types')
+    label=_('View document types'), name='document_type_view'
 )
diff --git a/mayan/apps/documents/search.py b/mayan/apps/documents/search.py
index e418c7d48a..8694fec75a 100644
--- a/mayan/apps/documents/search.py
+++ b/mayan/apps/documents/search.py
@@ -9,7 +9,7 @@ from .permissions import permission_document_view
 document_search = SearchModel(
     app_label='documents', model_name='Document',
     permission=permission_document_view,
-    serializer_string='mayan.apps.documents.serializers.DocumentSerializer'
+    serializer_path='mayan.apps.documents.serializers.DocumentSerializer'
 )
 
 document_search.add_model_field(
@@ -27,7 +27,7 @@ document_search.add_model_field(
 document_page_search = SearchModel(
     app_label='documents', model_name='DocumentPageResult',
     permission=permission_document_view,
-    serializer_string='mayan.apps.documents.serializers.DocumentPageSerializer'
+    serializer_path='mayan.apps.documents.serializers.DocumentPageSerializer'
 )
 
 document_page_search.add_model_field(
diff --git a/mayan/apps/documents/serializers.py b/mayan/apps/documents/serializers.py
index fcda698ce4..9632a546cb 100644
--- a/mayan/apps/documents/serializers.py
+++ b/mayan/apps/documents/serializers.py
@@ -26,14 +26,14 @@ class DocumentPageSerializer(serializers.HyperlinkedModelSerializer):
 
     def get_document_version_url(self, instance):
         return reverse(
-            'rest_api:documentversion-detail', args=(
+            viewname='rest_api:documentversion-detail', args=(
                 instance.document.pk, instance.document_version.pk,
             ), request=self.context['request'], format=self.context['format']
         )
 
     def get_image_url(self, instance):
         return reverse(
-            'rest_api:documentpage-image', args=(
+            viewname='rest_api:documentpage-image', args=(
                 instance.document.pk, instance.document_version.pk,
                 instance.pk,
             ), request=self.context['request'], format=self.context['format']
@@ -41,7 +41,7 @@ class DocumentPageSerializer(serializers.HyperlinkedModelSerializer):
 
     def get_url(self, instance):
         return reverse(
-            'rest_api:documentpage-detail', args=(
+            viewname='rest_api:documentpage-detail', args=(
                 instance.document.pk, instance.document_version.pk,
                 instance.pk,
             ), request=self.context['request'], format=self.context['format']
@@ -121,28 +121,28 @@ class DocumentVersionSerializer(serializers.HyperlinkedModelSerializer):
 
     def get_document_url(self, instance):
         return reverse(
-            'rest_api:document-detail', args=(
+            viewname='rest_api:document-detail', args=(
                 instance.document.pk,
             ), request=self.context['request'], format=self.context['format']
         )
 
     def get_download_url(self, instance):
         return reverse(
-            'rest_api:documentversion-download', args=(
+            viewname='rest_api:documentversion-download', args=(
                 instance.document.pk, instance.pk,
             ), request=self.context['request'], format=self.context['format']
         )
 
     def get_pages_url(self, instance):
         return reverse(
-            'rest_api:documentversion-page-list', args=(
+            viewname='rest_api:documentversion-page-list', args=(
                 instance.document.pk, instance.pk,
             ), request=self.context['request'], format=self.context['format']
         )
 
     def get_url(self, instance):
         return reverse(
-            'rest_api:documentversion-detail', args=(
+            viewname='rest_api:documentversion-detail', args=(
                 instance.document.pk, instance.pk,
             ), request=self.context['request'], format=self.context['format']
         )
@@ -167,28 +167,28 @@ class WritableDocumentVersionSerializer(serializers.ModelSerializer):
 
     def get_document_url(self, instance):
         return reverse(
-            'rest_api:document-detail', args=(
+            viewname='rest_api:document-detail', args=(
                 instance.document.pk,
             ), request=self.context['request'], format=self.context['format']
         )
 
     def get_download_url(self, instance):
         return reverse(
-            'rest_api:documentversion-download', args=(
+            viewname='rest_api:documentversion-download', args=(
                 instance.document.pk, instance.pk,
             ), request=self.context['request'], format=self.context['format']
         )
 
     def get_pages_url(self, instance):
         return reverse(
-            'rest_api:documentversion-page-list', args=(
+            viewname='rest_api:documentversion-page-list', args=(
                 instance.document.pk, instance.pk,
             ), request=self.context['request'], format=self.context['format']
         )
 
     def get_url(self, instance):
         return reverse(
-            'rest_api:documentversion-detail', args=(
+            viewname='rest_api:documentversion-detail', args=(
                 instance.document.pk, instance.pk,
             ), request=self.context['request'], format=self.context['format']
         )
diff --git a/mayan/apps/documents/settings.py b/mayan/apps/documents/settings.py
index c1f63d249f..b70235a44a 100644
--- a/mayan/apps/documents/settings.py
+++ b/mayan/apps/documents/settings.py
@@ -11,7 +11,7 @@ from .literals import (
     DEFAULT_DOCUMENTS_HASH_BLOCK_SIZE, DEFAULT_LANGUAGE, DEFAULT_LANGUAGE_CODES
 )
 
-namespace = Namespace(name='documents', label=_('Documents'))
+namespace = Namespace(label=_('Documents'), name='documents')
 
 setting_documentimagecache_storage = namespace.add_setting(
     global_name='DOCUMENTS_CACHE_STORAGE_BACKEND',
diff --git a/mayan/apps/documents/storages.py b/mayan/apps/documents/storages.py
index f29ebd17bb..95405e9242 100644
--- a/mayan/apps/documents/storages.py
+++ b/mayan/apps/documents/storages.py
@@ -10,7 +10,8 @@ except ImportError:
 from django.utils.module_loading import import_string
 
 from .settings import (
-    setting_documentimagecache_storage, setting_documentimagecache_storage_arguments,
+    setting_documentimagecache_storage,
+    setting_documentimagecache_storage_arguments,
     setting_storage_backend, setting_storage_backend_arguments
 )
 
diff --git a/mayan/apps/documents/tasks.py b/mayan/apps/documents/tasks.py
index 8e230846d4..55dd75150c 100644
--- a/mayan/apps/documents/tasks.py
+++ b/mayan/apps/documents/tasks.py
@@ -58,10 +58,10 @@ def task_delete_document(deleted_document_id):
         app_label='documents', model_name='DeletedDocument'
     )
 
-    logger.debug('Executing')
+    logger.debug(msg='Executing')
     deleted_document = DeletedDocument.objects.get(pk=deleted_document_id)
     deleted_document.delete()
-    logger.debug('Finshed')
+    logger.debug(msg='Finshed')
 
 
 @app.task(ignore_result=True)
@@ -70,9 +70,9 @@ def task_delete_stubs():
         app_label='documents', model_name='Document'
     )
 
-    logger.info('Executing')
+    logger.info(msg='Executing')
     Document.passthrough.delete_stubs()
-    logger.info('Finshed')
+    logger.info(msg='Finshed')
 
 
 @app.task()
diff --git a/mayan/apps/documents/tests/test_search.py b/mayan/apps/documents/tests/test_search.py
index 13d2eff0f4..fa594063ba 100644
--- a/mayan/apps/documents/tests/test_search.py
+++ b/mayan/apps/documents/tests/test_search.py
@@ -18,23 +18,23 @@ class DocumentSearchTestCase(DocumentTestMixin, BaseTestCase):
         )
 
     def test_document_page_search_no_access(self):
-        queryset, elapsed_time = self._perform_document_page_search()
+        queryset = self._perform_document_page_search()
         self.assertFalse(self.document.pages.first() in queryset)
 
     def test_document_page_search_with_access(self):
         self.grant_access(
             obj=self.test_document, permission=permission_document_view
         )
-        queryset, elapsed_time = self._perform_document_page_search()
+        queryset = self._perform_document_page_search()
         self.assertTrue(self.document.pages.first() in queryset)
 
     def test_document_search_no_access(self):
-        queryset, elapsed_time = self._perform_document_search()
+        queryset = self._perform_document_search()
         self.assertFalse(self.document in queryset)
 
     def test_document_search_with_access(self):
         self.grant_access(
             obj=self.test_document, permission=permission_document_view
         )
-        queryset, elapsed_time = self._perform_document_search()
+        queryset = self._perform_document_search()
         self.assertTrue(self.document in queryset)
diff --git a/mayan/apps/documents/views/document_views.py b/mayan/apps/documents/views/document_views.py
index 5f05d7a81f..b5c0c68f28 100644
--- a/mayan/apps/documents/views/document_views.py
+++ b/mayan/apps/documents/views/document_views.py
@@ -714,7 +714,7 @@ class RecentAddedDocumentListView(DocumentListView):
             pk__in=Document.objects.order_by('-date_added')[
                 :setting_recent_added_count.value
             ].values('pk')
-        ). order_by('-date_added')
+        ).order_by('-date_added')
 
     def get_extra_context(self):
         context = super(RecentAddedDocumentListView, self).get_extra_context()
diff --git a/mayan/apps/dynamic_search/classes.py b/mayan/apps/dynamic_search/classes.py
index 43d9d88566..2f4965f332 100644
--- a/mayan/apps/dynamic_search/classes.py
+++ b/mayan/apps/dynamic_search/classes.py
@@ -93,13 +93,13 @@ class SearchModel(object):
 
         return result
 
-    def __init__(self, app_label, model_name, serializer_string, label=None, permission=None):
+    def __init__(self, app_label, model_name, serializer_path, label=None, permission=None):
         self.app_label = app_label
         self.model_name = model_name
         self.search_fields = []
         self._model = None  # Lazy
         self._label = label
-        self.serializer_path = serializer_string
+        self.serializer_path = serializer_path
         self.permission = permission
         self.__class__._registry[self.get_full_name()] = self
 
diff --git a/mayan/apps/dynamic_search/views.py b/mayan/apps/dynamic_search/views.py
index 38c68f65db..13fb7a545f 100644
--- a/mayan/apps/dynamic_search/views.py
+++ b/mayan/apps/dynamic_search/views.py
@@ -11,7 +11,6 @@ from mayan.apps.common.generics import SimpleView, SingleObjectListView
 from .forms import SearchForm, AdvancedSearchForm
 from .icons import icon_search_submit
 from .mixins import SearchModelMixin
-from .settings import setting_limit
 
 logger = logging.getLogger(__name__)
 
@@ -27,7 +26,6 @@ class ResultsView(SearchModelMixin, SingleObjectListView):
             ),
             'no_results_title': _('No search results'),
             'search_model': self.search_model,
-            'search_results_limit': setting_limit.value,
             'title': _('Search results for: %s') % self.search_model.label,
         }
 
diff --git a/mayan/apps/events/apps.py b/mayan/apps/events/apps.py
index 0fad6b1bde..986d83c65d 100644
--- a/mayan/apps/events/apps.py
+++ b/mayan/apps/events/apps.py
@@ -35,6 +35,8 @@ class EventsApp(MayanAppConfig):
         Notification = self.get_model(model_name='Notification')
         StoredEventType = self.get_model(model_name='StoredEventType')
 
+        # Add labels to Action model, they are not marked translatable in the
+        # upstream package.
         SourceColumn(
             attribute='timestamp', is_identifier=True,
             is_sortable=True, label=_('Date and time'), source=Action
diff --git a/mayan/apps/events/permissions.py b/mayan/apps/events/permissions.py
index c0953352d5..49fbeafcb4 100644
--- a/mayan/apps/events/permissions.py
+++ b/mayan/apps/events/permissions.py
@@ -4,8 +4,8 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.permissions import PermissionNamespace
 
-namespace = PermissionNamespace(name='events', label=_('Events'))
+namespace = PermissionNamespace(label=_('Events'), name='events')
 
 permission_events_view = namespace.add_permission(
-    name='events_view', label=_('Access the events of an object')
+    label=_('Access the events of an object'), name='events_view'
 )
diff --git a/mayan/apps/events/serializers.py b/mayan/apps/events/serializers.py
index c15a853bd8..b9ade3ed8a 100644
--- a/mayan/apps/events/serializers.py
+++ b/mayan/apps/events/serializers.py
@@ -26,7 +26,7 @@ class EventTypeNamespaceSerializer(serializers.Serializer):
 
     def get_url(self, instance):
         return reverse(
-            'rest_api:event-type-namespace-detail', args=(
+            viewname='rest_api:event-type-namespace-detail', args=(
                 instance.name,
             ), request=self.context['request'], format=self.context['format']
         )
@@ -40,7 +40,7 @@ class EventTypeSerializer(serializers.Serializer):
 
     def get_event_type_namespace_url(self, instance):
         return reverse(
-            'rest_api:event-type-namespace-detail', args=(
+            viewname='rest_api:event-type-namespace-detail', args=(
                 instance.namespace.name,
             ), request=self.context['request'], format=self.context['format']
         )
diff --git a/mayan/apps/events/views.py b/mayan/apps/events/views.py
index 4c3680fc04..cc4aabb5e8 100644
--- a/mayan/apps/events/views.py
+++ b/mayan/apps/events/views.py
@@ -128,7 +128,9 @@ class NotificationListView(SingleObjectListView):
 class NotificationMarkRead(SimpleView):
     def dispatch(self, *args, **kwargs):
         self.get_queryset().filter(pk=self.kwargs['pk']).update(read=True)
-        return HttpResponseRedirect(reverse('events:user_notifications_list'))
+        return HttpResponseRedirect(
+            redirect_to=reverse(viewname='events:user_notifications_list')
+        )
 
     def get_queryset(self):
         return self.request.user.notifications.all()
@@ -137,7 +139,9 @@ class NotificationMarkRead(SimpleView):
 class NotificationMarkReadAll(SimpleView):
     def dispatch(self, *args, **kwargs):
         self.get_queryset().update(read=True)
-        return HttpResponseRedirect(reverse('events:user_notifications_list'))
+        return HttpResponseRedirect(
+            redirect_to=reverse(viewname='events:user_notifications_list')
+        )
 
     def get_queryset(self):
         return self.request.user.notifications.all()
@@ -191,7 +195,9 @@ class ObjectEventTypeSubscriptionListView(FormView):
 
     def dispatch(self, *args, **kwargs):
         EventType.refresh()
-        return super(ObjectEventTypeSubscriptionListView, self).dispatch(*args, **kwargs)
+        return super(ObjectEventTypeSubscriptionListView, self).dispatch(
+            *args, **kwargs
+        )
 
     def form_valid(self, form):
         try:
@@ -228,8 +234,8 @@ class ObjectEventTypeSubscriptionListView(FormView):
             raise Http404
 
         AccessControlList.objects.check_access(
-            permissions=permission_events_view, user=self.request.user,
-            obj=content_object
+            obj=content_object, permissions=permission_events_view,
+            user=self.request.user
         )
 
         return content_object
@@ -248,11 +254,13 @@ class ObjectEventTypeSubscriptionListView(FormView):
         initial = []
 
         for element in self.get_queryset():
-            initial.append({
-                'user': self.request.user,
-                'object': obj,
-                'stored_event_type': element,
-            })
+            initial.append(
+                {
+                    'user': self.request.user,
+                    'object': obj,
+                    'stored_event_type': element,
+                }
+            )
         return initial
 
     def get_queryset(self):
diff --git a/mayan/apps/linking/api_views.py b/mayan/apps/linking/api_views.py
index dec9bab408..66d2cac738 100644
--- a/mayan/apps/linking/api_views.py
+++ b/mayan/apps/linking/api_views.py
@@ -35,8 +35,8 @@ class APIResolvedSmartLinkDocumentListView(generics.ListAPIView):
         document = get_object_or_404(klass=Document, pk=self.kwargs['pk'])
 
         AccessControlList.objects.check_access(
-            permissions=permission_document_view, user=self.request.user,
-            obj=document
+            obj=document, permissions=permission_document_view,
+            user=self.request.user
         )
 
         return document
@@ -58,7 +58,9 @@ class APIResolvedSmartLinkDocumentListView(generics.ListAPIView):
         """
         Extra context provided to the serializer class.
         """
-        context = super(APIResolvedSmartLinkDocumentListView, self).get_serializer_context()
+        context = super(
+            APIResolvedSmartLinkDocumentListView, self
+        ).get_serializer_context()
         if self.kwargs:
             context.update(
                 {
@@ -89,8 +91,8 @@ class APIResolvedSmartLinkView(generics.RetrieveAPIView):
         document = get_object_or_404(klass=Document, pk=self.kwargs['pk'])
 
         AccessControlList.objects.check_access(
-            permissions=permission_document_view, user=self.request.user,
-            obj=document
+            obj=document, permissions=permission_document_view,
+            user=self.request.user
         )
 
         return document
@@ -126,8 +128,8 @@ class APIResolvedSmartLinkListView(generics.ListAPIView):
         document = get_object_or_404(klass=Document, pk=self.kwargs['pk'])
 
         AccessControlList.objects.check_access(
-            permissions=permission_document_view, user=self.request.user,
-            obj=document
+            obj=document, permissions=permission_document_view,
+            user=self.request.user
         )
 
         return document
@@ -185,8 +187,8 @@ class APISmartLinkConditionListView(generics.ListCreateAPIView):
         smart_link = get_object_or_404(klass=SmartLink, pk=self.kwargs['pk'])
 
         AccessControlList.objects.check_access(
-            permissions=permission_required, user=self.request.user,
-            obj=smart_link
+            obj=smart_link, permissions=permission_required,
+            user=self.request.user
         )
 
         return smart_link
@@ -228,8 +230,8 @@ class APISmartLinkConditionView(generics.RetrieveUpdateDestroyAPIView):
         smart_link = get_object_or_404(klass=SmartLink, pk=self.kwargs['pk'])
 
         AccessControlList.objects.check_access(
-            permissions=permission_required, user=self.request.user,
-            obj=smart_link
+            obj=smart_link, permissions=permission_required,
+            user=self.request.user
         )
 
         return smart_link
diff --git a/mayan/apps/linking/apps.py b/mayan/apps/linking/apps.py
index aaffed74c0..59ff8f0020 100644
--- a/mayan/apps/linking/apps.py
+++ b/mayan/apps/linking/apps.py
@@ -42,9 +42,9 @@ class LinkingApp(MayanAppConfig):
             app_label='documents', model_name='Document'
         )
 
-        ResolvedSmartLink = self.get_model('ResolvedSmartLink')
-        SmartLink = self.get_model('SmartLink')
-        SmartLinkCondition = self.get_model('SmartLinkCondition')
+        ResolvedSmartLink = self.get_model(model_name='ResolvedSmartLink')
+        SmartLink = self.get_model(model_name='SmartLink')
+        SmartLinkCondition = self.get_model(model_name='SmartLinkCondition')
 
         ModelPermission.register(
             model=SmartLink, permissions=(
@@ -62,16 +62,14 @@ class LinkingApp(MayanAppConfig):
         )
 
         SourceColumn(
-            source=SmartLink, label=_('Dynamic label'),
-            attribute='dynamic_label'
+            attribute='dynamic_label', source=SmartLink
         )
         SourceColumn(
-            attribute='enabled', label=_('Enabled'), source=SmartLink,
-            widget=TwoStateWidget
+            attribute='enabled', source=SmartLink, widget=TwoStateWidget
         )
 
         SourceColumn(
-            attribute='enabled', label=_('Enabled'), source=SmartLinkCondition,
+            attribute='enabled', source=SmartLinkCondition,
             widget=TwoStateWidget
         )
 
diff --git a/mayan/apps/linking/permissions.py b/mayan/apps/linking/permissions.py
index 4111e42c5a..3bae121d04 100644
--- a/mayan/apps/linking/permissions.py
+++ b/mayan/apps/linking/permissions.py
@@ -4,17 +4,17 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.permissions import PermissionNamespace
 
-namespace = PermissionNamespace(name='linking', label=_('Smart links'))
+namespace = PermissionNamespace(label=_('Smart links'), name='linking')
 
-permission_smart_link_view = namespace.add_permission(
-    name='smart_link_view', label=_('View existing smart links')
-)
 permission_smart_link_create = namespace.add_permission(
-    name='smart_link_create', label=_('Create new smart links')
+    label=_('Create new smart links'), name='smart_link_create'
 )
 permission_smart_link_delete = namespace.add_permission(
-    name='smart_link_delete', label=_('Delete smart links')
+    label=_('Delete smart links'), name='smart_link_delete'
 )
 permission_smart_link_edit = namespace.add_permission(
-    name='smart_link_edit', label=_('Edit smart links')
+    label=_('Edit smart links'), name='smart_link_edit'
+)
+permission_smart_link_view = namespace.add_permission(
+    label=_('View existing smart links'), name='smart_link_view'
 )
diff --git a/mayan/apps/linking/serializers.py b/mayan/apps/linking/serializers.py
index 03b18d0eb4..229c30f37a 100644
--- a/mayan/apps/linking/serializers.py
+++ b/mayan/apps/linking/serializers.py
@@ -31,13 +31,13 @@ class SmartLinkConditionSerializer(serializers.HyperlinkedModelSerializer):
 
     def get_smart_link_url(self, instance):
         return reverse(
-            'rest_api:smartlink-detail', args=(instance.smart_link.pk,),
+            viewname='rest_api:smartlink-detail', args=(instance.smart_link.pk,),
             request=self.context['request'], format=self.context['format']
         )
 
     def get_url(self, instance):
         return reverse(
-            'rest_api:smartlinkcondition-detail', args=(
+            viewname='rest_api:smartlinkcondition-detail', args=(
                 instance.smart_link.pk, instance.pk,
             ), request=self.context['request'], format=self.context['format']
         )
@@ -71,7 +71,7 @@ class ResolvedSmartLinkDocumentSerializer(DocumentSerializer):
 
     def get_resolved_smart_link_url(self, instance):
         return reverse(
-            'rest_api:resolvedsmartlink-detail', args=(
+            viewname='rest_api:resolvedsmartlink-detail', args=(
                 self.context['document'].pk, self.context['smart_link'].pk
             ), request=self.context['request'],
             format=self.context['format']
@@ -92,7 +92,7 @@ class ResolvedSmartLinkSerializer(SmartLinkSerializer):
 
     def get_resolved_documents_url(self, instance):
         return reverse(
-            'rest_api:resolvedsmartlinkdocument-list',
+            viewname='rest_api:resolvedsmartlinkdocument-list',
             args=(self.context['document'].pk, instance.pk,),
             request=self.context['request'], format=self.context['format']
         )
@@ -102,7 +102,7 @@ class ResolvedSmartLinkSerializer(SmartLinkSerializer):
 
     def get_resolved_smart_link_url(self, instance):
         return reverse(
-            'rest_api:resolvedsmartlink-detail',
+            viewname='rest_api:resolvedsmartlink-detail',
             args=(self.context['document'].pk, instance.pk,),
             request=self.context['request'], format=self.context['format']
         )
diff --git a/mayan/apps/linking/views.py b/mayan/apps/linking/views.py
index 7c9114e10d..c4b5e4c5f0 100644
--- a/mayan/apps/linking/views.py
+++ b/mayan/apps/linking/views.py
@@ -40,13 +40,13 @@ class ResolvedSmartLinkView(DocumentListView):
         )
 
         AccessControlList.objects.check_access(
-            permissions=permission_document_view, user=request.user,
-            obj=self.document
+            obj=self.document, permissions=permission_document_view,
+            user=request.user
         )
 
         AccessControlList.objects.check_access(
-            permissions=permission_smart_link_view, user=request.user,
-            obj=self.smart_link
+            obj=self.smart_link, permissions=permission_smart_link_view,
+            user=request.user
         )
 
         return super(
@@ -61,8 +61,8 @@ class ResolvedSmartLinkView(DocumentListView):
 
             try:
                 AccessControlList.objects.check_access(
-                    permissions=permission_smart_link_edit, user=self.request.user,
-                    obj=self.smart_link
+                    obj=self.smart_link, permissions=permission_smart_link_edit,
+                    user=self.request.user,
                 )
             except PermissionDenied:
                 pass
@@ -170,8 +170,8 @@ class DocumentSmartLinkListView(SmartLinkListView):
         self.document = get_object_or_404(klass=Document, pk=self.kwargs['pk'])
 
         AccessControlList.objects.check_access(
-            permissions=permission_document_view, user=request.user,
-            obj=self.document
+            obj=self.document, permissions=permission_document_view,
+            user=request.user
         )
 
         return super(
@@ -277,8 +277,8 @@ class SmartLinkConditionCreateView(SingleObjectCreateView):
 
     def dispatch(self, request, *args, **kwargs):
         AccessControlList.objects.check_access(
-            permissions=permission_smart_link_edit, user=request.user,
-            obj=self.get_smart_link()
+            obj=self.get_smart_link(), permissions=permission_smart_link_edit,
+            user=request.user
         )
 
         return super(
@@ -316,8 +316,8 @@ class SmartLinkConditionEditView(SingleObjectEditView):
 
     def dispatch(self, request, *args, **kwargs):
         AccessControlList.objects.check_access(
-            permissions=permission_smart_link_edit, user=request.user,
-            obj=self.get_object().smart_link
+            obj=self.get_object().smart_link,
+            permissions=permission_smart_link_edit, user=request.user
         )
 
         return super(
@@ -345,8 +345,8 @@ class SmartLinkConditionDeleteView(SingleObjectDeleteView):
 
     def dispatch(self, request, *args, **kwargs):
         AccessControlList.objects.check_access(
-            permissions=permission_smart_link_edit, user=request.user,
-            obj=self.get_object().smart_link
+            obj=self.get_object().smart_link,
+            permissions=permission_smart_link_edit, user=request.user
         )
 
         return super(
diff --git a/mayan/apps/lock_manager/backends/file_lock.py b/mayan/apps/lock_manager/backends/file_lock.py
index 16a8fd96c3..6630c5ba0c 100644
--- a/mayan/apps/lock_manager/backends/file_lock.py
+++ b/mayan/apps/lock_manager/backends/file_lock.py
@@ -23,7 +23,9 @@ lock = threading.Lock()
 logger = logging.getLogger(__name__)
 
 lock_file = os.path.join(
-    setting_temporary_directory.value, hashlib.sha256(force_bytes(settings.SECRET_KEY)).hexdigest()
+    setting_temporary_directory.value, hashlib.sha256(
+        force_bytes(settings.SECRET_KEY)
+    ).hexdigest()
 )
 open(lock_file, 'a').close()
 logger.debug('lock_file: %s', lock_file)
diff --git a/mayan/apps/lock_manager/literals.py b/mayan/apps/lock_manager/literals.py
new file mode 100644
index 0000000000..fa84c33e02
--- /dev/null
+++ b/mayan/apps/lock_manager/literals.py
@@ -0,0 +1,4 @@
+from __future__ import unicode_literals
+
+DEFAULT_BACKEND = 'mayan.apps.lock_manager.backends.file_lock.FileLock'
+DEFAULT_LOCK_TIMEOUT_VALUE = 30
diff --git a/mayan/apps/lock_manager/runtime.py b/mayan/apps/lock_manager/runtime.py
index 3c4a54de02..27e8d636b5 100644
--- a/mayan/apps/lock_manager/runtime.py
+++ b/mayan/apps/lock_manager/runtime.py
@@ -2,4 +2,4 @@ from django.utils.module_loading import import_string
 
 from .settings import setting_backend
 
-locking_backend = import_string(setting_backend.value)
+locking_backend = import_string(dotted_path=setting_backend.value)
diff --git a/mayan/apps/lock_manager/settings.py b/mayan/apps/lock_manager/settings.py
index defbc79a99..d401b4c462 100644
--- a/mayan/apps/lock_manager/settings.py
+++ b/mayan/apps/lock_manager/settings.py
@@ -4,10 +4,9 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.smart_settings import Namespace
 
-DEFAULT_BACKEND = 'mayan.apps.lock_manager.backends.file_lock.FileLock'
-DEFAULT_LOCK_TIMEOUT_VALUE = 30
+from .literals import DEFAULT_BACKEND, DEFAULT_LOCK_TIMEOUT_VALUE
 
-namespace = Namespace(name='lock_manager', label=_('Lock manager'))
+namespace = Namespace(label=_('Lock manager'), name='lock_manager')
 
 setting_backend = namespace.add_setting(
     default=DEFAULT_BACKEND,
diff --git a/mayan/apps/metadata/queues.py b/mayan/apps/metadata/queues.py
index 16775657fb..c57d66cc4c 100644
--- a/mayan/apps/metadata/queues.py
+++ b/mayan/apps/metadata/queues.py
@@ -5,13 +5,13 @@ from django.utils.translation import ugettext_lazy as _
 from mayan.apps.task_manager.classes import CeleryQueue
 
 queue_metadata = CeleryQueue(
-    name='metadata', label=_('Metadata')
+    label=_('Metadata'), name='metadata'
 )
 queue_metadata.add_task_type(
-    name='mayan.apps.metadata.tasks.task_remove_metadata_type',
-    label=_('Remove metadata type')
+    label=_('Remove metadata type'),
+    name='mayan.apps.metadata.tasks.task_remove_metadata_type'
 )
 queue_metadata.add_task_type(
-    name='mayan.apps.metadata.tasks.task_add_required_metadata_type',
-    label=_('Add required metadata type')
+    label=_('Add required metadata type'),
+    name='mayan.apps.metadata.tasks.task_add_required_metadata_type'
 )
diff --git a/mayan/apps/metadata/search.py b/mayan/apps/metadata/search.py
index ba11ff1ca2..37023357ea 100644
--- a/mayan/apps/metadata/search.py
+++ b/mayan/apps/metadata/search.py
@@ -9,7 +9,7 @@ from .permissions import permission_metadata_type_view
 metadata_type_search = SearchModel(
     app_label='metadata', model_name='MetadataType',
     permission=permission_metadata_type_view,
-    serializer_string='mayan.apps.metadata.serializers.MetadataTypeSerializer'
+    serializer_path='mayan.apps.metadata.serializers.MetadataTypeSerializer'
 )
 
 metadata_type_search.add_model_field(
diff --git a/mayan/apps/metadata/settings.py b/mayan/apps/metadata/settings.py
index bb40bca391..ce7aa6de35 100644
--- a/mayan/apps/metadata/settings.py
+++ b/mayan/apps/metadata/settings.py
@@ -7,7 +7,8 @@ from mayan.apps.smart_settings import Namespace
 from .parsers import MetadataParser
 from .validators import MetadataValidator
 
-namespace = Namespace(name='metadata', label=_('Metadata'))
+namespace = Namespace(label=_('Metadata'), name='metadata')
+
 setting_available_validators = namespace.add_setting(
     global_name='METADATA_AVAILABLE_VALIDATORS',
     default=MetadataValidator.get_import_paths()
diff --git a/mayan/apps/metadata/tests/test_api.py b/mayan/apps/metadata/tests/test_api.py
index 7b48afcae6..763529453f 100644
--- a/mayan/apps/metadata/tests/test_api.py
+++ b/mayan/apps/metadata/tests/test_api.py
@@ -488,7 +488,7 @@ class DocumentMetadataAPITestCase(DocumentTestMixin, BaseAPITestCase):
             viewname='rest_api:documentmetadata-detail',
             kwargs={
                 'document_pk': self.test_document.pk,
-                'metadata_type': self.test_document_metadata.pk
+                'metadata_pk': self.test_document_metadata.pk
             }, data={
                 'value': TEST_METADATA_VALUE_EDITED
             }
diff --git a/mayan/apps/metadata/validators.py b/mayan/apps/metadata/validators.py
index 702c70f8d9..1c16ac3bee 100644
--- a/mayan/apps/metadata/validators.py
+++ b/mayan/apps/metadata/validators.py
@@ -32,6 +32,6 @@ class TimeValidator(MetadataValidator):
         return parse(input_data).time().isoformat()
 
 
-MetadataValidator.register(DateAndTimeValidator)
-MetadataValidator.register(DateValidator)
-MetadataValidator.register(TimeValidator)
+MetadataValidator.register(parser=DateAndTimeValidator)
+MetadataValidator.register(parser=DateValidator)
+MetadataValidator.register(parser=TimeValidator)
diff --git a/mayan/apps/metadata/views.py b/mayan/apps/metadata/views.py
index f50b783d1f..178a39c784 100644
--- a/mayan/apps/metadata/views.py
+++ b/mayan/apps/metadata/views.py
@@ -69,7 +69,7 @@ class DocumentMetadataAddView(MultipleObjectFormActionView):
                     'Selected documents must be of the same type.'
                 ), request=request
             )
-            return HttpResponseRedirect(self.previous_url)
+            return HttpResponseRedirect(redirect_to=self.previous_url)
 
         return result
 
diff --git a/mayan/apps/metadata/wizard_steps.py b/mayan/apps/metadata/wizard_steps.py
index 0d76500fb0..b36db7c8a5 100644
--- a/mayan/apps/metadata/wizard_steps.py
+++ b/mayan/apps/metadata/wizard_steps.py
@@ -67,4 +67,4 @@ class WizardStepMetadata(WizardStep):
             )
 
 
-WizardStep.register(WizardStepMetadata)
+WizardStep.register(step=WizardStepMetadata)
diff --git a/mayan/apps/mirroring/settings.py b/mayan/apps/mirroring/settings.py
index 2dfb4d6ee0..aa16aa1335 100644
--- a/mayan/apps/mirroring/settings.py
+++ b/mayan/apps/mirroring/settings.py
@@ -4,7 +4,7 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.smart_settings import Namespace
 
-namespace = Namespace(name='mirroring', label=_('Mirroring'))
+namespace = Namespace(label=_('Mirroring'), name='mirroring')
 
 setting_document_lookup_cache_timeout = namespace.add_setting(
     global_name='MIRRORING_DOCUMENT_CACHE_LOOKUP_TIMEOUT', default=10,
diff --git a/mayan/apps/motd/apps.py b/mayan/apps/motd/apps.py
index c0c14d1a81..090309d041 100644
--- a/mayan/apps/motd/apps.py
+++ b/mayan/apps/motd/apps.py
@@ -37,7 +37,7 @@ class MOTDApp(MayanAppConfig):
     def ready(self):
         super(MOTDApp, self).ready()
 
-        Message = self.get_model('Message')
+        Message = self.get_model(model_name='Message')
         ModelPermission.register(
             model=Message, permissions=(
                 permission_acl_edit, permission_acl_view,
diff --git a/mayan/apps/motd/permissions.py b/mayan/apps/motd/permissions.py
index da60db4e8d..6c22706a74 100644
--- a/mayan/apps/motd/permissions.py
+++ b/mayan/apps/motd/permissions.py
@@ -4,17 +4,17 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.permissions import PermissionNamespace
 
-namespace = PermissionNamespace(name='motd', label=_('Message of the day'))
+namespace = PermissionNamespace(label=_('Message of the day'), name='motd')
 
 permission_message_create = namespace.add_permission(
-    name='message_create', label=_('Create messages')
+    label=_('Create messages'), name='message_create'
 )
 permission_message_delete = namespace.add_permission(
-    name='message_delete', label=_('Delete messages')
+    label=_('Delete messages'), name='message_delete'
 )
 permission_message_edit = namespace.add_permission(
-    name='message_edit', label=_('Edit messages')
+    label=_('Edit messages'), name='message_edit'
 )
 permission_message_view = namespace.add_permission(
-    name='message_view', label=_('View messages')
+    label=_('View messages'), name='message_view'
 )
diff --git a/mayan/apps/ocr/apps.py b/mayan/apps/ocr/apps.py
index 1db19025f7..0cfd5ba9ff 100644
--- a/mayan/apps/ocr/apps.py
+++ b/mayan/apps/ocr/apps.py
@@ -71,7 +71,9 @@ class OCRApp(MayanAppConfig):
             app_label='documents', model_name='DocumentVersion'
         )
 
-        DocumentVersionOCRError = self.get_model('DocumentVersionOCRError')
+        DocumentVersionOCRError = self.get_model(
+            model_name='DocumentVersionOCRError'
+        )
 
         Document.add_to_class(
             name='submit_for_ocr', value=method_document_ocr_submit
@@ -84,7 +86,7 @@ class OCRApp(MayanAppConfig):
         )
 
         ModelField(
-            Document, name='versions__pages__ocr_content__content'
+            model=Document, name='versions__pages__ocr_content__content'
         )
 
         ModelPermission.register(
diff --git a/mayan/apps/ocr/events.py b/mayan/apps/ocr/events.py
index a77827bb47..c793b6edee 100644
--- a/mayan/apps/ocr/events.py
+++ b/mayan/apps/ocr/events.py
@@ -4,7 +4,7 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.events import EventTypeNamespace
 
-namespace = EventTypeNamespace(name='ocr', label=_('OCR'))
+namespace = EventTypeNamespace(label=_('OCR'), name='ocr')
 
 event_ocr_document_version_submit = namespace.add_event_type(
     label=_('Document version submitted for OCR'),
diff --git a/mayan/apps/ocr/permissions.py b/mayan/apps/ocr/permissions.py
index d27eedc56e..b5121fd779 100644
--- a/mayan/apps/ocr/permissions.py
+++ b/mayan/apps/ocr/permissions.py
@@ -4,16 +4,16 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.permissions import PermissionNamespace
 
-namespace = PermissionNamespace(name='ocr', label=_('OCR'))
+namespace = PermissionNamespace(label=_('OCR'), name='ocr')
 
 permission_ocr_document = namespace.add_permission(
-    name='ocr_document', label=_('Submit documents for OCR')
+    label=_('Submit documents for OCR'), name='ocr_document'
 )
 permission_ocr_content_view = namespace.add_permission(
-    name='ocr_content_view',
-    label=_('View the transcribed text from document')
+    label=_('View the transcribed text from document'),
+    name='ocr_content_view'
 )
 permission_document_type_ocr_setup = namespace.add_permission(
-    name='ocr_document_type_setup',
-    label=_('Change document type OCR settings')
+    label=_('Change document type OCR settings'),
+    name='ocr_document_type_setup'
 )
diff --git a/mayan/apps/ocr/runtime.py b/mayan/apps/ocr/runtime.py
index 06d20559a8..1d8643819b 100644
--- a/mayan/apps/ocr/runtime.py
+++ b/mayan/apps/ocr/runtime.py
@@ -12,7 +12,7 @@ from django.utils.module_loading import import_string
 from .settings import setting_ocr_backend, setting_ocr_backend_arguments
 
 ocr_backend = import_string(
-    setting_ocr_backend.value
+    dotted_path=setting_ocr_backend.value
 )(
     **yaml.load(
         stream=setting_ocr_backend_arguments.value or '{}', Loader=SafeLoader
diff --git a/mayan/apps/ocr/settings.py b/mayan/apps/ocr/settings.py
index 19f6e6e5cd..b13ad70111 100644
--- a/mayan/apps/ocr/settings.py
+++ b/mayan/apps/ocr/settings.py
@@ -4,7 +4,7 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.smart_settings import Namespace
 
-namespace = Namespace(name='ocr', label=_('OCR'))
+namespace = Namespace(label=_('OCR'), name='ocr')
 
 setting_ocr_backend = namespace.add_setting(
     global_name='OCR_BACKEND', default='mayan.apps.ocr.backends.pyocr.PyOCR',
diff --git a/mayan/apps/ocr/views.py b/mayan/apps/ocr/views.py
index 9ff9f2b4e6..8174f2b267 100644
--- a/mayan/apps/ocr/views.py
+++ b/mayan/apps/ocr/views.py
@@ -76,9 +76,9 @@ class DocumentSubmitView(MultipleObjectConfirmActionView):
 
         result = {
             'title': ungettext(
-                'Submit the selected document to the OCR queue?',
-                'Submit the selected documents to the OCR queue?',
-                queryset.count()
+                singular='Submit the selected document to the OCR queue?',
+                plural='Submit the selected documents to the OCR queue?',
+                number=queryset.count()
             )
         }
 
diff --git a/mayan/apps/permissions/permissions.py b/mayan/apps/permissions/permissions.py
index af5b345485..986b5b5485 100644
--- a/mayan/apps/permissions/permissions.py
+++ b/mayan/apps/permissions/permissions.py
@@ -4,17 +4,17 @@ from django.utils.translation import ugettext_lazy as _
 
 from . import PermissionNamespace
 
-namespace = PermissionNamespace(name='permissions', label=_('Permissions'))
+namespace = PermissionNamespace(label=_('Permissions'), name='permissions')
 
-permission_role_view = namespace.add_permission(
-    name='role_view', label=_('View roles')
-)
-permission_role_edit = namespace.add_permission(
-    name='role_edit', label=_('Edit roles')
-)
 permission_role_create = namespace.add_permission(
-    name='role_create', label=_('Create roles')
+    label=_('Create roles'), name='role_create'
 )
 permission_role_delete = namespace.add_permission(
-    name='role_delete', label=_('Delete roles')
+    label=_('Delete roles'), name='role_delete'
+)
+permission_role_edit = namespace.add_permission(
+    label=_('Edit roles'), name='role_edit'
+)
+permission_role_view = namespace.add_permission(
+    label=_('View roles'), name='role_view'
 )
diff --git a/mayan/apps/permissions/search.py b/mayan/apps/permissions/search.py
index 21ac3f9c52..a5aca3473f 100644
--- a/mayan/apps/permissions/search.py
+++ b/mayan/apps/permissions/search.py
@@ -9,7 +9,7 @@ from .permissions import permission_role_view
 role_search = SearchModel(
     app_label='permissions', model_name='Role',
     permission=permission_role_view,
-    serializer_string='mayan.apps.permissions.serializers.RoleSerializer'
+    serializer_path='mayan.apps.permissions.serializers.RoleSerializer'
 )
 
 role_search.add_model_field(
diff --git a/mayan/apps/permissions/tests/test_views.py b/mayan/apps/permissions/tests/test_views.py
index 2c803a6c19..0dbb610aff 100644
--- a/mayan/apps/permissions/tests/test_views.py
+++ b/mayan/apps/permissions/tests/test_views.py
@@ -127,7 +127,7 @@ class GroupRoleViewTestCase(GroupTestMixin, GroupRoleViewTestMixin, RoleTestMixi
         self._create_test_group()
 
         response = self._request_test_group_roles_view()
-        self.assertEqual(response.status_code, 403)
+        self.assertEqual(response.status_code, 404)
 
     def test_group_roles_view_with_access(self):
         self._create_test_group()
diff --git a/mayan/apps/smart_settings/permissions.py b/mayan/apps/smart_settings/permissions.py
index b1426603f0..1f49f411ea 100644
--- a/mayan/apps/smart_settings/permissions.py
+++ b/mayan/apps/smart_settings/permissions.py
@@ -5,12 +5,12 @@ from django.utils.translation import ugettext_lazy as _
 from mayan.apps.permissions import PermissionNamespace
 
 namespace = PermissionNamespace(
-    name='smart_settings', label=_('Smart settings')
+    label=_('Smart settings'), name='smart_settings'
 )
 
 permission_settings_edit = namespace.add_permission(
-    name='permission_settings_edit', label=_('Edit settings')
+    label=_('Edit settings'), name='permission_settings_edit'
 )
 permission_settings_view = namespace.add_permission(
-    name='permission_settings_view', label=_('View settings')
+    label=_('View settings'), name='permission_settings_view'
 )
diff --git a/mayan/apps/smart_settings/views.py b/mayan/apps/smart_settings/views.py
index 44d768f4c6..5669cd1076 100644
--- a/mayan/apps/smart_settings/views.py
+++ b/mayan/apps/smart_settings/views.py
@@ -12,17 +12,6 @@ from .forms import SettingForm
 from .permissions import permission_settings_edit, permission_settings_view
 
 
-class NamespaceListView(SingleObjectListView):
-    extra_context = {
-        'hide_link': True,
-        'title': _('Setting namespaces'),
-    }
-    view_permission = permission_settings_view
-
-    def get_object_list(self):
-        return Namespace.get_all()
-
-
 class NamespaceDetailView(SingleObjectListView):
     view_permission = permission_settings_view
 
@@ -39,7 +28,7 @@ class NamespaceDetailView(SingleObjectListView):
 
     def get_namespace(self):
         try:
-            return Namespace.get(self.kwargs['namespace_name'])
+            return Namespace.get(name=self.kwargs['namespace_name'])
         except KeyError:
             raise Http404(
                 _('Namespace: %s, not found') % self.kwargs['namespace_name']
@@ -49,6 +38,17 @@ class NamespaceDetailView(SingleObjectListView):
         return self.get_namespace().settings
 
 
+class NamespaceListView(SingleObjectListView):
+    extra_context = {
+        'hide_link': True,
+        'title': _('Setting namespaces'),
+    }
+    view_permission = permission_settings_view
+
+    def get_object_list(self):
+        return Namespace.get_all()
+
+
 class SettingEditView(FormView):
     form_class = SettingForm
     view_permission = permission_settings_edit
diff --git a/mayan/apps/sources/apps.py b/mayan/apps/sources/apps.py
index 676b6b7a74..78a7241dd6 100644
--- a/mayan/apps/sources/apps.py
+++ b/mayan/apps/sources/apps.py
@@ -19,8 +19,8 @@ from mayan.celery import app
 
 from .classes import StagingFile
 from .handlers import (
-    copy_transformations_to_version, create_default_document_source,
-    initialize_periodic_tasks
+    handler_copy_transformations_to_version, handler_create_default_document_source,
+    handler_initialize_periodic_tasks
 )
 from .links import (
     link_document_create_multiple, link_setup_sources,
@@ -46,14 +46,14 @@ class SourcesApp(MayanAppConfig):
     def ready(self):
         super(SourcesApp, self).ready()
 
-        POP3Email = self.get_model('POP3Email')
-        IMAPEmail = self.get_model('IMAPEmail')
-        Source = self.get_model('Source')
-        SourceLog = self.get_model('SourceLog')
-        SaneScanner = self.get_model('SaneScanner')
-        StagingFolderSource = self.get_model('StagingFolderSource')
-        WatchFolderSource = self.get_model('WatchFolderSource')
-        WebFormSource = self.get_model('WebFormSource')
+        POP3Email = self.get_model(model_name='POP3Email')
+        IMAPEmail = self.get_model(model_name='IMAPEmail')
+        Source = self.get_model(model_name='Source')
+        SourceLog = self.get_model(model_name='SourceLog')
+        SaneScanner = self.get_model(model_name='SaneScanner')
+        StagingFolderSource = self.get_model(model_name='StagingFolderSource')
+        WatchFolderSource = self.get_model(model_name='WatchFolderSource')
+        WebFormSource = self.get_model(model_name='WebFormSource')
 
         MissingItem(
             label=_('Create a document source'),
@@ -186,14 +186,14 @@ class SourcesApp(MayanAppConfig):
         )
 
         post_upgrade.connect(
-            initialize_periodic_tasks,
-            dispatch_uid='initialize_periodic_tasks'
+            receiver=handler_initialize_periodic_tasks,
+            dispatch_uid='sources_handler_initialize_periodic_tasks'
         )
         post_initial_setup.connect(
-            create_default_document_source,
-            dispatch_uid='create_default_document_source'
+            receiver=handler_create_default_document_source,
+            dispatch_uid='sources_handler_create_default_document_source'
         )
         post_version_upload.connect(
-            copy_transformations_to_version,
-            dispatch_uid='copy_transformations_to_version'
+            receiver=handler_copy_transformations_to_version,
+            dispatch_uid='sources_handler_copy_transformations_to_version'
         )
diff --git a/mayan/apps/sources/handlers.py b/mayan/apps/sources/handlers.py
index 59f09f0ca5..522031e405 100644
--- a/mayan/apps/sources/handlers.py
+++ b/mayan/apps/sources/handlers.py
@@ -6,18 +6,7 @@ from django.utils.translation import ugettext_lazy as _
 from .literals import SOURCE_UNCOMPRESS_CHOICE_ASK
 
 
-def create_default_document_source(sender, **kwargs):
-    WebFormSource = apps.get_model(
-        app_label='sources', model_name='WebFormSource'
-    )
-
-    if not WebFormSource.objects.count():
-        WebFormSource.objects.create(
-            label=_('Default'), uncompress=SOURCE_UNCOMPRESS_CHOICE_ASK
-        )
-
-
-def copy_transformations_to_version(sender, **kwargs):
+def handler_copy_transformations_to_version(sender, **kwargs):
     Transformation = apps.get_model(
         app_label='converter', model_name='Transformation'
     )
@@ -31,7 +20,18 @@ def copy_transformations_to_version(sender, **kwargs):
     )
 
 
-def initialize_periodic_tasks(sender, **kwargs):
+def handler_create_default_document_source(sender, **kwargs):
+    WebFormSource = apps.get_model(
+        app_label='sources', model_name='WebFormSource'
+    )
+
+    if not WebFormSource.objects.count():
+        WebFormSource.objects.create(
+            label=_('Default'), uncompress=SOURCE_UNCOMPRESS_CHOICE_ASK
+        )
+
+
+def handler_initialize_periodic_tasks(sender, **kwargs):
     POP3Email = apps.get_model(app_label='sources', model_name='POP3Email')
     IMAPEmail = apps.get_model(app_label='sources', model_name='IMAPEmail')
     WatchFolderSource = apps.get_model(
diff --git a/mayan/apps/sources/links.py b/mayan/apps/sources/links.py
index ee4ae783b4..54005bc39b 100644
--- a/mayan/apps/sources/links.py
+++ b/mayan/apps/sources/links.py
@@ -27,8 +27,8 @@ def condition_check_document_creation_acls(context):
     )
 
     queryset = AccessControlList.objects.filter_by_access(
-        permission=permission_document_create, user=context['user'],
-        queryset=DocumentType.objects.all()
+        permission=permission_document_create,
+        queryset=DocumentType.objects.all(), user=context['user']
     )
 
     if queryset:
diff --git a/mayan/apps/sources/models/base.py b/mayan/apps/sources/models/base.py
index 8ef6bf32a4..aa87a4efae 100644
--- a/mayan/apps/sources/models/base.py
+++ b/mayan/apps/sources/models/base.py
@@ -52,7 +52,10 @@ class Source(models.Model):
     def fullname(self):
         return ' '.join([self.class_fullname(), '"%s"' % self.label])
 
-    def handle_upload(self, file_object, description=None, document_type=None, expand=False, label=None, language=None, user=None):
+    def handle_upload(
+        self, file_object, description=None, document_type=None, expand=False,
+        label=None, language=None, user=None
+    ):
         """
         Handle an upload request from a file object which may be an individual
         document or a compressed file containing multiple documents.
@@ -80,7 +83,7 @@ class Source(models.Model):
                             )
                         )
             except NoMIMETypeMatch:
-                logging.debug('Exception: NoMIMETypeMatch')
+                logging.debug(msg='Exception: NoMIMETypeMatch')
                 documents.append(
                     self.upload_document(file_object=file_object, **kwargs)
                 )
@@ -97,7 +100,10 @@ class Source(models.Model):
         pass
         # TODO: Should raise NotImplementedError?
 
-    def upload_document(self, file_object, document_type, description=None, label=None, language=None, querystring=None, user=None):
+    def upload_document(
+        self, file_object, document_type, description=None, label=None,
+        language=None, querystring=None, user=None
+    ):
         """
         Upload an individual document
         """
@@ -123,7 +129,7 @@ class Source(models.Model):
                 )
 
                 if user:
-                    document.add_as_recent_document_for_user(user)
+                    document.add_as_recent_document_for_user(user=user)
 
                 Transformation.objects.copy(
                     source=self, targets=document_version.pages.all()
diff --git a/mayan/apps/sources/models/email_sources.py b/mayan/apps/sources/models/email_sources.py
index c0c5758408..7b9f8b67d5 100644
--- a/mayan/apps/sources/models/email_sources.py
+++ b/mayan/apps/sources/models/email_sources.py
@@ -137,7 +137,8 @@ class EmailBaseModel(IntervalBaseModel):
                             stream=file_object.read(), Loader=SafeLoader
                         )
                         logger.debug(
-                            'Got metadata dictionary: %s', metadata_dictionary
+                            'Got metadata dictionary: %s',
+                            metadata_dictionary
                         )
                     else:
                         documents = source.handle_upload(
@@ -164,8 +165,8 @@ class EmailBaseModel(IntervalBaseModel):
                     with ContentFile(content=force_bytes(message.body), name=label) as file_object:
                         documents = source.handle_upload(
                             document_type=source.document_type,
-                            file_object=file_object,
-                            expand=SOURCE_UNCOMPRESS_CHOICE_N
+                            expand=SOURCE_UNCOMPRESS_CHOICE_N,
+                            file_object=file_object
                         )
                         if metadata_dictionary:
                             for document in documents:
@@ -221,17 +222,17 @@ class IMAPEmail(EmailBaseModel):
 
     # http://www.doughellmann.com/PyMOTW/imaplib/
     def check_source(self, test=False):
-        logger.debug('Starting IMAP email fetch')
+        logger.debug(msg='Starting IMAP email fetch')
         logger.debug('host: %s', self.host)
         logger.debug('ssl: %s', self.ssl)
 
         if self.ssl:
-            mailbox = imaplib.IMAP4_SSL(self.host, self.port)
+            mailbox = imaplib.IMAP4_SSL(host=self.host, port=self.port)
         else:
-            mailbox = imaplib.IMAP4(self.host, self.port)
+            mailbox = imaplib.IMAP4(host=self.host, port=self.port)
 
-        mailbox.login(self.username, self.password)
-        mailbox.select(self.mailbox)
+        mailbox.login(user=self.username, password=self.password)
+        mailbox.select(mailbox=self.mailbox)
 
         status, data = mailbox.search(None, 'NOT', 'DELETED')
         if data:
@@ -240,12 +241,17 @@ class IMAPEmail(EmailBaseModel):
 
             for message_number in messages_info:
                 logger.debug('message_number: %s', message_number)
-                status, data = mailbox.fetch(message_number, '(RFC822)')
+                status, data = mailbox.fetch(
+                    message_set=message_number, message_parts='(RFC822)'
+                )
                 EmailBaseModel.process_message(
                     source=self, message_text=data[0][1]
                 )
                 if not test:
-                    mailbox.store(message_number, '+FLAGS', '\\Deleted')
+                    mailbox.store(
+                        message_set=message_number, command='+FLAGS',
+                        flag_list='\\Deleted'
+                    )
 
         mailbox.expunge()
         mailbox.close()
@@ -266,22 +272,24 @@ class POP3Email(EmailBaseModel):
         verbose_name_plural = _('POP email')
 
     def check_source(self, test=False):
-        logger.debug('Starting POP3 email fetch')
+        logger.debug(msg='Starting POP3 email fetch')
         logger.debug('host: %s', self.host)
         logger.debug('ssl: %s', self.ssl)
 
         if self.ssl:
-            mailbox = poplib.POP3_SSL(self.host, self.port)
+            mailbox = poplib.POP3_SSL(host=self.host, post=self.port)
         else:
-            mailbox = poplib.POP3(self.host, self.port, timeout=self.timeout)
+            mailbox = poplib.POP3(
+                host=self.host, post=self.port, timeout=self.timeout
+            )
 
         mailbox.getwelcome()
-        mailbox.user(self.username)
-        mailbox.pass_(self.password)
+        mailbox.user(username=self.username)
+        mailbox.pass_(password=self.password)
         messages_info = mailbox.list()
 
-        logger.debug('messages_info:')
-        logger.debug(messages_info)
+        logger.debug(msg='messages_info:')
+        logger.debug(msg=messages_info)
         logger.debug('messages count: %s', len(messages_info[1]))
 
         for message_info in messages_info[1]:
@@ -295,6 +303,6 @@ class POP3Email(EmailBaseModel):
                 source=self, message_text=complete_message
             )
             if not test:
-                mailbox.dele(message_number)
+                mailbox.dele(which=message_number)
 
         mailbox.quit()
diff --git a/mayan/apps/sources/models/staging_folder_sources.py b/mayan/apps/sources/models/staging_folder_sources.py
index 35d3222bb5..819001af55 100644
--- a/mayan/apps/sources/models/staging_folder_sources.py
+++ b/mayan/apps/sources/models/staging_folder_sources.py
@@ -75,8 +75,8 @@ class StagingFolderSource(InteractiveSource):
                 upload_file_object.extra_data.delete()
             except Exception as exception:
                 logger.error(
-                    'Error deleting staging file: %s; %s', upload_file_object,
-                    exception
+                    'Error deleting staging file: %s; %s',
+                    upload_file_object, exception
                 )
                 raise Exception(
                     _('Error deleting staging file; %s') % exception
@@ -91,8 +91,8 @@ class StagingFolderSource(InteractiveSource):
                 yield self.get_file(filename=entry)
         except OSError as exception:
             logger.error(
-                'Unable get list of staging files from source: %s; %s', self,
-                exception
+                'Unable get list of staging files from source: %s; %s',
+                self, exception
             )
             raise Exception(
                 _('Unable get list of staging files: %s') % exception
diff --git a/mayan/apps/sources/models/watch_folder_sources.py b/mayan/apps/sources/models/watch_folder_sources.py
index 4addda6075..8f65c20faa 100644
--- a/mayan/apps/sources/models/watch_folder_sources.py
+++ b/mayan/apps/sources/models/watch_folder_sources.py
@@ -50,9 +50,9 @@ class WatchFolderSource(IntervalBaseModel):
         path = Path(self.folder_path)
 
         if self.include_subdirectories:
-            iterator = path.rglob('*')
+            iterator = path.rglob(pattern='*')
         else:
-            iterator = path.glob('*')
+            iterator = path.glob(pattern='*')
 
         for entry in iterator:
             if entry.is_file() or entry.is_symlink():
diff --git a/mayan/apps/sources/permissions.py b/mayan/apps/sources/permissions.py
index a6d35ec03d..d7b1cdcc6c 100644
--- a/mayan/apps/sources/permissions.py
+++ b/mayan/apps/sources/permissions.py
@@ -4,20 +4,20 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.permissions import PermissionNamespace
 
-namespace = PermissionNamespace(name='sources_setup', label=_('Sources setup'))
+namespace = PermissionNamespace(label=_('Sources setup'), name='sources_setup')
 
 permission_sources_setup_create = namespace.add_permission(
-    name='sources_setup_create', label=_('Create new document sources')
+    label=_('Create new document sources'), name='sources_setup_create'
 )
 permission_sources_setup_delete = namespace.add_permission(
-    name='sources_setup_delete', label=_('Delete document sources')
+    label=_('Delete document sources'), name='sources_setup_delete'
 )
 permission_sources_setup_edit = namespace.add_permission(
-    name='sources_setup_edit', label=_('Edit document sources')
+    label=_('Edit document sources'), name='sources_setup_edit'
 )
 permission_sources_setup_view = namespace.add_permission(
-    name='sources_setup_view', label=_('View existing document sources')
+    label=_('View existing document sources'), name='sources_setup_view'
 )
 permission_staging_file_delete = namespace.add_permission(
-    name='sources_staging_file_delete', label=_('Delete staging files')
+    label=_('Delete staging files'), name='sources_staging_file_delete'
 )
diff --git a/mayan/apps/sources/queues.py b/mayan/apps/sources/queues.py
index eebc52c0e4..8793292a97 100644
--- a/mayan/apps/sources/queues.py
+++ b/mayan/apps/sources/queues.py
@@ -5,28 +5,28 @@ from django.utils.translation import ugettext_lazy as _
 from mayan.apps.task_manager.classes import CeleryQueue
 
 queue_sources = CeleryQueue(
-    name='sources', label=_('Sources')
+    label=_('Sources'), name='sources'
 )
 queue_sources_periodic = CeleryQueue(
-    name='sources_periodic', label=_('Sources periodic'), transient=True
+    label=_('Sources periodic'), name='sources_periodic', transient=True
 )
 queue_sources_fast = CeleryQueue(
-    name='sources_fast', label=_('Sources fast'), transient=True
+    label=_('Sources fast'), name='sources_fast', transient=True
 )
 
 queue_sources_fast.add_task_type(
-    name='mayan.apps.sources.tasks.task_generate_staging_file_image',
-    label=_('Generate staging file image')
+    label=_('Generate staging file image'),
+    name='mayan.apps.sources.tasks.task_generate_staging_file_image'
 )
 queue_sources_periodic.add_task_type(
-    name='mayan.apps.sources.tasks.task_check_interval_source',
-    label=_('Check interval source')
+    label=_('Check interval source'),
+    name='mayan.apps.sources.tasks.task_check_interval_source'
 )
 queue_sources.add_task_type(
-    name='mayan.apps.sources.tasks.task_source_handle_upload',
-    label=_('Handle upload')
+    label=_('Handle upload'),
+    name='mayan.apps.sources.tasks.task_source_handle_upload'
 )
 queue_sources.add_task_type(
-    name='mayan.apps.sources.tasks.task_upload_document',
-    label=_('Upload document')
+    label=_('Upload document'),
+    name='mayan.apps.sources.tasks.task_upload_document'
 )
diff --git a/mayan/apps/sources/serializers.py b/mayan/apps/sources/serializers.py
index 5da2f6af0a..b01d88df5a 100644
--- a/mayan/apps/sources/serializers.py
+++ b/mayan/apps/sources/serializers.py
@@ -17,14 +17,14 @@ class StagingFolderFileSerializer(serializers.Serializer):
 
     def get_image_url(self, obj):
         return reverse(
-            'stagingfolderfile-image-view',
+            viewname='stagingfolderfile-image-view',
             args=(obj.staging_folder.pk, obj.encoded_filename,),
             request=self.context.get('request')
         )
 
     def get_url(self, obj):
         return reverse(
-            'stagingfolderfile-detail',
+            viewname='stagingfolderfile-detail',
             args=(obj.staging_folder.pk, obj.encoded_filename,),
             request=self.context.get('request')
         )
diff --git a/mayan/apps/sources/settings.py b/mayan/apps/sources/settings.py
index ff9385be8c..8f0156d427 100644
--- a/mayan/apps/sources/settings.py
+++ b/mayan/apps/sources/settings.py
@@ -7,7 +7,7 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.smart_settings import Namespace
 
-namespace = Namespace(name='sources', label=_('Sources'))
+namespace = Namespace(label=_('Sources'), name='sources')
 
 setting_scanimage_path = namespace.add_setting(
     global_name='SOURCES_SCANIMAGE_PATH', default='/usr/bin/scanimage',
diff --git a/mayan/apps/sources/tests/test_views.py b/mayan/apps/sources/tests/test_views.py
index c9f141fe5c..d2b7f00c7e 100644
--- a/mayan/apps/sources/tests/test_views.py
+++ b/mayan/apps/sources/tests/test_views.py
@@ -203,23 +203,27 @@ class NewDocumentVersionViewTestCase(GenericDocumentViewTestCase):
         NewVersionBlock.objects.block(self.test_document)
 
         response = self.post(
-            viewname='sources:upload_version', args=(self.document.pk,),
-            follow=True
+            viewname='sources:upload_version', kwargs={
+                'document_pk': self.document.pk
+            }, follow=True
         )
 
         self.assertContains(
-            response, text='blocked from uploading',
+            response=response, text='blocked from uploading',
             status_code=200
         )
 
         response = self.get(
-            'documents:document_version_list', args=(self.document.pk,),
-            follow=True
+            viewname='documents:document_version_list', kwargs={
+                'pk': self.document.pk
+            }, follow=True
         )
 
         # Needed by the url view resolver
         response.context.current_app = None
-        resolved_link = link_document_version_upload.resolve(context=response.context)
+        resolved_link = link_document_version_upload.resolve(
+            context=response.context
+        )
 
         self.assertEqual(resolved_link, None)
 
@@ -228,7 +232,7 @@ class StagingFolderViewTestCase(GenericViewTestCase):
     def setUp(self):
         super(StagingFolderViewTestCase, self).setUp()
         self.temporary_directory = mkdtemp()
-        shutil.copy(TEST_SMALL_DOCUMENT_PATH, self.temporary_directory)
+        shutil.copy(src=TEST_SMALL_DOCUMENT_PATH, dst=self.temporary_directory)
 
         self.filename = os.path.basename(TEST_SMALL_DOCUMENT_PATH)
 
@@ -238,9 +242,10 @@ class StagingFolderViewTestCase(GenericViewTestCase):
 
     def _request_staging_file_delete_view(self, staging_folder, staging_file):
         return self.post(
-            viewname='sources:staging_file_delete', args=(
-                staging_folder.pk, staging_file.encoded_filename
-            )
+            viewname='sources:staging_file_delete', kwargs={
+                'pk': staging_folder.pk,
+                'encoded_filename': staging_file.encoded_filename
+            }
         )
 
     def test_staging_folder_delete_no_permission(self):
@@ -259,6 +264,7 @@ class StagingFolderViewTestCase(GenericViewTestCase):
             staging_folder=staging_folder, staging_file=staging_file
         )
         self.assertEqual(response.status_code, 403)
+
         self.assertEqual(len(list(staging_folder.get_files())), 1)
 
     def test_staging_folder_delete_with_permission(self):
@@ -279,6 +285,7 @@ class StagingFolderViewTestCase(GenericViewTestCase):
             staging_folder=staging_folder, staging_file=staging_file
         )
         self.assertEqual(response.status_code, 302)
+
         self.assertEqual(len(list(staging_folder.get_files())), 0)
 
 
diff --git a/mayan/apps/sources/views.py b/mayan/apps/sources/views.py
index c27a8fb02b..66b71811da 100644
--- a/mayan/apps/sources/views.py
+++ b/mayan/apps/sources/views.py
@@ -126,7 +126,7 @@ class UploadBaseView(MultiFormView):
                 ), request=request
             )
             return HttpResponseRedirect(
-                reverse(viewname='sources:setup_source_list')
+                redirect_to=reverse(viewname='sources:setup_source_list')
             )
 
         return super(UploadBaseView, self).dispatch(request, *args, **kwargs)
@@ -184,9 +184,11 @@ class UploadBaseView(MultiFormView):
         menu_facet.bound_links['sources:upload_interactive'] = self.tab_links
         menu_facet.bound_links['sources:upload_version'] = self.tab_links
 
-        context.update({
-            'subtemplates_list': subtemplates_list,
-        })
+        context.update(
+            {
+                'subtemplates_list': subtemplates_list,
+            }
+        )
 
         return context
 
@@ -203,8 +205,8 @@ class UploadInteractiveView(UploadBaseView):
         )
 
         AccessControlList.objects.check_access(
-            permissions=permission_document_create, user=request.user,
-            obj=self.document_type
+            obj=self.document_type, permissions=permission_document_create,
+            user=request.user
         )
 
         self.tab_links = UploadBaseView.get_active_tab_links()
@@ -282,9 +284,7 @@ class UploadInteractiveView(UploadBaseView):
                     'exception': exception,
                     'exception_class': type(exception),
                 }
-                logger.critical(
-                    message, exc_info=True
-                )
+                logger.critical(msg=message, exc_info=True)
                 raise type(exception)(message)
             else:
                 messages.success(
@@ -295,7 +295,7 @@ class UploadInteractiveView(UploadBaseView):
                 )
 
         return HttpResponseRedirect(
-            '{}?{}'.format(
+            redirect_to='{}?{}'.format(
                 reverse(
                     viewname=self.request.resolver_match.view_name,
                     kwargs=self.request.resolver_match.kwargs
@@ -378,7 +378,7 @@ class UploadInteractiveVersionView(UploadBaseView):
                 ) % self.document, request=self.request
             )
             return HttpResponseRedirect(
-                reverse(
+                redirect_to=reverse(
                     viewname='documents:document_version_list', kwargs={
                         'pk': self.document.pk
                     }
@@ -386,8 +386,8 @@ class UploadInteractiveVersionView(UploadBaseView):
             )
 
         AccessControlList.objects.check_access(
-            permissions=permission_document_new_version,
-            user=self.request.user, obj=self.document
+            obj=self.document, permissions=permission_document_new_version,
+            user=self.request.user
         )
 
         self.tab_links = UploadBaseView.get_active_tab_links(self.document)
@@ -433,7 +433,7 @@ class UploadInteractiveVersionView(UploadBaseView):
             )
 
         return HttpResponseRedirect(
-            reverse(
+            redirect_to=reverse(
                 viewname='documents:document_version_list', kwargs={
                     'pk': self.document.pk
                 }
diff --git a/mayan/apps/sources/wizards.py b/mayan/apps/sources/wizards.py
index 8b8f7549b8..df6093279c 100644
--- a/mayan/apps/sources/wizards.py
+++ b/mayan/apps/sources/wizards.py
@@ -18,8 +18,8 @@ from .icons import icon_wizard_submit
 
 
 class WizardStep(object):
-    _registry = {}
     _deregistry = {}
+    _registry = {}
 
     @classmethod
     def deregister(cls, step):
@@ -104,7 +104,7 @@ class WizardStepDocumentType(WizardStep):
 
     @classmethod
     def done(cls, wizard):
-        cleaned_data = wizard.get_cleaned_data_for_step(cls.name)
+        cleaned_data = wizard.get_cleaned_data_for_step(step=cls.name)
         if cleaned_data:
             return {
                 'document_type_id': cleaned_data['document_type'].pk
@@ -127,7 +127,9 @@ class DocumentCreateWizard(SessionWizardView):
     @classonlymethod
     def as_view(cls, *args, **kwargs):
         cls.form_list = WizardStep.get_choices(attribute_name='form_class')
-        cls.condition_dict = dict(WizardStep.get_choices(attribute_name='condition'))
+        cls.condition_dict = dict(
+            WizardStep.get_choices(attribute_name='condition')
+        )
         return super(DocumentCreateWizard, cls).as_view(*args, **kwargs)
 
     def dispatch(self, request, *args, **kwargs):
@@ -136,21 +138,27 @@ class DocumentCreateWizard(SessionWizardView):
         )
 
         form_list = WizardStep.get_choices(attribute_name='form_class')
-        condition_dict = dict(WizardStep.get_choices(attribute_name='condition'))
+        condition_dict = dict(
+            WizardStep.get_choices(attribute_name='condition')
+        )
 
-        result = self.__class__.get_initkwargs(form_list=form_list, condition_dict=condition_dict)
+        result = self.__class__.get_initkwargs(
+            condition_dict=condition_dict, form_list=form_list
+        )
         self.form_list = result['form_list']
         self.condition_dict = result['condition_dict']
 
         if not InteractiveSource.objects.filter(enabled=True).exists():
             messages.error(
-                request,
-                _(
+                message=_(
                     'No interactive document sources have been defined or '
                     'none have been enabled, create one before proceeding.'
-                )
+                ),
+                request=request
+            )
+            return HttpResponseRedirect(
+                redirect_to=reverse(viewname='sources:setup_source_list')
             )
-            return HttpResponseRedirect(reverse('sources:setup_source_list'))
 
         return super(
             DocumentCreateWizard, self
@@ -163,20 +171,22 @@ class DocumentCreateWizard(SessionWizardView):
 
         wizard_step = WizardStep.get(name=self.steps.current)
 
-        context.update({
-            'form_css_classes': 'form-hotkey-double-click',
-            'step_title': _(
-                'Step %(step)d of %(total_steps)d: %(step_label)s'
-            ) % {
-                'step': self.steps.step1, 'total_steps': len(self.form_list),
-                'step_label': wizard_step.label,
-            },
-            'submit_label': _('Next step'),
-            'submit_icon_class': icon_wizard_submit,
-            'title': _('Document upload wizard'),
-            'wizard_step': wizard_step,
-            'wizard_steps': WizardStep.get_all(),
-        })
+        context.update(
+            {
+                'form_css_classes': 'form-hotkey-double-click',
+                'step_title': _(
+                    'Step %(step)d of %(total_steps)d: %(step_label)s'
+                ) % {
+                    'step': self.steps.step1, 'total_steps': len(self.form_list),
+                    'step_label': wizard_step.label,
+                },
+                'submit_label': _('Next step'),
+                'submit_icon_class': icon_wizard_submit,
+                'title': _('Document upload wizard'),
+                'wizard_step': wizard_step,
+                'wizard_steps': WizardStep.get_all(),
+            }
+        )
         return context
 
     def get_form_initial(self, step):
@@ -196,4 +206,4 @@ class DocumentCreateWizard(SessionWizardView):
         # urlencode(doseq=True)
         url.args = query_dict
 
-        return HttpResponseRedirect(url)
+        return HttpResponseRedirect(redirect_to=url)
diff --git a/mayan/apps/tags/apps.py b/mayan/apps/tags/apps.py
index 14e18ace68..49fa63b9c0 100644
--- a/mayan/apps/tags/apps.py
+++ b/mayan/apps/tags/apps.py
@@ -64,8 +64,8 @@ class TagsApp(MayanAppConfig):
             app_label='documents', model_name='DocumentPageResult'
         )
 
-        DocumentTag = self.get_model('DocumentTag')
-        Tag = self.get_model('Tag')
+        DocumentTag = self.get_model(model_name='DocumentTag')
+        Tag = self.get_model(model_name='Tag')
 
         Document.add_to_class(
             name='attached_tags', value=method_document_get_tags
@@ -78,12 +78,8 @@ class TagsApp(MayanAppConfig):
             )
         )
 
-        ModelField(
-            Document, name='tags__label'
-        )
-        ModelField(
-            Document, name='tags__color'
-        )
+        ModelField(model=Document, name='tags__label')
+        ModelField(model=Document, name='tags__color')
 
         ModelPermission.register(
             model=Document, permissions=(
@@ -106,7 +102,7 @@ class TagsApp(MayanAppConfig):
             source=DocumentTag
         )
         SourceColumn(
-            source=DocumentTag, attribute='get_preview_widget'
+            attribute='get_preview_widget', source=DocumentTag
         )
 
         SourceColumn(
@@ -129,7 +125,7 @@ class TagsApp(MayanAppConfig):
             source=Tag
         )
         SourceColumn(
-            source=Tag, attribute='get_preview_widget'
+            attribute='get_preview_widget', source=Tag
         )
         SourceColumn(
             source=Tag, label=_('Documents'),
@@ -191,13 +187,13 @@ class TagsApp(MayanAppConfig):
         # Index update
 
         m2m_changed.connect(
-            handler_index_document,
             dispatch_uid='tags_handler_index_document',
+            receiver=handler_index_document,
             sender=Tag.documents.through
         )
 
         pre_delete.connect(
-            handler_tag_pre_delete,
             dispatch_uid='tags_handler_tag_pre_delete',
+            receiver=handler_tag_pre_delete,
             sender=Tag
         )
diff --git a/mayan/apps/tags/events.py b/mayan/apps/tags/events.py
index 44f5793802..8f753bbbe9 100644
--- a/mayan/apps/tags/events.py
+++ b/mayan/apps/tags/events.py
@@ -4,7 +4,7 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.events import EventTypeNamespace
 
-namespace = EventTypeNamespace(name='tags', label=_('Tags'))
+namespace = EventTypeNamespace(label=_('Tags'), name='tags')
 
 event_tag_attach = namespace.add_event_type(
     label=_('Tag attached to document'), name='attach'
diff --git a/mayan/apps/tags/permissions.py b/mayan/apps/tags/permissions.py
index aa4b895def..2d3476edcb 100644
--- a/mayan/apps/tags/permissions.py
+++ b/mayan/apps/tags/permissions.py
@@ -4,23 +4,23 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.permissions import PermissionNamespace
 
-namespace = PermissionNamespace(name='tags', label=_('Tags'))
+namespace = PermissionNamespace(label=_('Tags'), name='tags')
 
 permission_tag_create = namespace.add_permission(
-    name='tag_create', label=_('Create new tags')
+    label=_('Create new tags'), name='tag_create'
 )
 permission_tag_delete = namespace.add_permission(
-    name='tag_delete', label=_('Delete tags')
+    label=_('Delete tags'), name='tag_delete'
 )
 permission_tag_view = namespace.add_permission(
-    name='tag_view', label=_('View tags')
+    label=_('View tags'), name='tag_view'
 )
 permission_tag_edit = namespace.add_permission(
-    name='tag_edit', label=_('Edit tags')
+    label=_('Edit tags'), name='tag_edit'
 )
 permission_tag_attach = namespace.add_permission(
-    name='tag_attach', label=_('Attach tags to documents')
+    label=_('Attach tags to documents'), name='tag_attach'
 )
 permission_tag_remove = namespace.add_permission(
-    name='tag_remove', label=_('Remove tags from documents')
+    label=_('Remove tags from documents'), name='tag_remove'
 )
diff --git a/mayan/apps/tags/search.py b/mayan/apps/tags/search.py
index f16b8e75c1..d728dd4520 100644
--- a/mayan/apps/tags/search.py
+++ b/mayan/apps/tags/search.py
@@ -9,7 +9,7 @@ from .permissions import permission_tag_view
 tag_search = SearchModel(
     app_label='tags', model_name='Tag',
     permission=permission_tag_view,
-    serializer_string='mayan.apps.tags.serializers.TagSerializer'
+    serializer_path='mayan.apps.tags.serializers.TagSerializer'
 )
 
 tag_search.add_model_field(
diff --git a/mayan/apps/tags/serializers.py b/mayan/apps/tags/serializers.py
index 64c3c01ded..ddaac4d0e1 100644
--- a/mayan/apps/tags/serializers.py
+++ b/mayan/apps/tags/serializers.py
@@ -95,7 +95,7 @@ class DocumentTagSerializer(TagSerializer):
 
     def get_document_tag_url(self, instance):
         return reverse(
-            'rest_api:document-tag-detail', args=(
+            viewname='rest_api:document-tag-detail', args=(
                 self.context['document'].pk, instance.pk
             ), request=self.context['request'], format=self.context['format']
         )
@@ -112,8 +112,8 @@ class NewDocumentTagSerializer(serializers.Serializer):
 
             try:
                 AccessControlList.objects.check_access(
-                    permissions=permission_tag_attach,
-                    user=self.context['request'].user, obj=tag
+                    obj=tag, permissions=permission_tag_attach,
+                    user=self.context['request'].user
                 )
             except PermissionDenied:
                 pass
diff --git a/mayan/apps/tags/tests/test_api.py b/mayan/apps/tags/tests/test_api.py
index f0602adc81..cb7a1ca4dd 100644
--- a/mayan/apps/tags/tests/test_api.py
+++ b/mayan/apps/tags/tests/test_api.py
@@ -166,7 +166,6 @@ class TagDocumentAPIViewTestCase(DocumentTestMixin, TagAPIViewTestMixin, TagTest
             force_text(self.test_document.uuid)
         )
 
-    ###
     def test_document_attach_tag_view_no_access(self):
         self._create_test_tag()
         self.upload_document()
diff --git a/mayan/apps/tags/views.py b/mayan/apps/tags/views.py
index b1d80f05c0..47b40c043f 100644
--- a/mayan/apps/tags/views.py
+++ b/mayan/apps/tags/views.py
@@ -76,7 +76,9 @@ class TagAttachActionView(MultipleObjectFormActionView):
         if queryset.count() == 1:
             result.update(
                 {
-                    'queryset': Tag.objects.exclude(pk__in=queryset.first().tags.all())
+                    'queryset': Tag.objects.exclude(
+                        pk__in=queryset.first().tags.all()
+                    )
                 }
             )
 
@@ -249,8 +251,8 @@ class DocumentTagListView(TagListView):
         self.document = get_object_or_404(klass=Document, pk=self.kwargs['pk'])
 
         AccessControlList.objects.check_access(
-            permissions=permission_document_view, user=request.user,
-            obj=self.document
+            obj=self.document, permissions=permission_document_view,
+            user=request.user,
         )
 
         return super(DocumentTagListView, self).dispatch(
diff --git a/mayan/apps/tags/wizard_steps.py b/mayan/apps/tags/wizard_steps.py
index 9961b5b1a0..8026a2a60b 100644
--- a/mayan/apps/tags/wizard_steps.py
+++ b/mayan/apps/tags/wizard_steps.py
@@ -58,4 +58,4 @@ class WizardStepTags(WizardStep):
             tag.documents.add(document)
 
 
-WizardStep.register(WizardStepTags)
+WizardStep.register(step=WizardStepTags)
diff --git a/mayan/apps/task_manager/permissions.py b/mayan/apps/task_manager/permissions.py
index bb6d7bcf6d..64c4ac745d 100644
--- a/mayan/apps/task_manager/permissions.py
+++ b/mayan/apps/task_manager/permissions.py
@@ -4,8 +4,8 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.permissions import PermissionNamespace
 
-namespace = PermissionNamespace(name='task_manager', label=_('Task manager'))
+namespace = PermissionNamespace(label=_('Task manager'), name='task_manager')
 
 permission_task_view = namespace.add_permission(
-    name='task_view', label=_('View tasks')
+    label=_('View tasks'), name='task_view'
 )
diff --git a/mayan/apps/task_manager/tests/test_views.py b/mayan/apps/task_manager/tests/test_views.py
index 6d2f35458b..f3506f969a 100644
--- a/mayan/apps/task_manager/tests/test_views.py
+++ b/mayan/apps/task_manager/tests/test_views.py
@@ -14,7 +14,6 @@ class TaskManagerViewTestCase(GenericViewTestCase):
         self.test_queue = CeleryQueue(
             label=TEST_QUEUE_LABEL, name=TEST_QUEUE_NAME
         )
-        self.login_user()
 
     def _request_active_task_list(self):
         return self.get(
@@ -48,43 +47,36 @@ class TaskManagerViewTestCase(GenericViewTestCase):
         self.grant_permission(permission=permission_task_view)
 
         response = self._request_queue_list()
-
         self.assertContains(
             response, text=self.test_queue.name, status_code=200
         )
 
     def test_active_task_list_view_no_permissions(self):
         response = self._request_active_task_list()
-
         self.assertEqual(response.status_code, 403)
 
     def test_active_task_list_view_with_permissions(self):
         self.grant_permission(permission=permission_task_view)
 
         response = self._request_active_task_list()
-
         self.assertEqual(response.status_code, 200)
 
     def test_reserved_task_list_view_no_permissions(self):
         response = self._request_reserved_task_list()
-
         self.assertEqual(response.status_code, 403)
 
     def test_reserved_task_list_view_with_permissions(self):
         self.grant_permission(permission=permission_task_view)
 
         response = self._request_reserved_task_list()
-
         self.assertEqual(response.status_code, 200)
 
     def test_scheduled_task_list_view_no_permissions(self):
         response = self._request_scheduled_task_list()
-
         self.assertEqual(response.status_code, 403)
 
     def test_scheduled_task_list_view_with_permissions(self):
         self.grant_permission(permission=permission_task_view)
 
         response = self._request_scheduled_task_list()
-
         self.assertEqual(response.status_code, 200)
diff --git a/mayan/apps/user_management/permissions.py b/mayan/apps/user_management/permissions.py
index a6be8ae190..08328a0d24 100644
--- a/mayan/apps/user_management/permissions.py
+++ b/mayan/apps/user_management/permissions.py
@@ -5,30 +5,30 @@ from django.utils.translation import ugettext_lazy as _
 from mayan.apps.permissions import PermissionNamespace
 
 namespace = PermissionNamespace(
-    name='user_management', label=_('User management')
+    label=_('User management'), name='user_management'
 )
 
 permission_group_create = namespace.add_permission(
-    name='group_create', label=_('Create new groups')
+    label=_('Create new groups'), name='group_create'
 )
 permission_group_delete = namespace.add_permission(
-    name='group_delete', label=_('Delete existing groups')
+    label=_('Delete existing groups'), name='group_delete'
 )
 permission_group_edit = namespace.add_permission(
-    name='group_edit', label=_('Edit existing groups')
+    label=_('Edit existing groups'), name='group_edit'
 )
 permission_group_view = namespace.add_permission(
-    name='group_view', label=_('View existing groups')
+    label=_('View existing groups'), name='group_view'
 )
 permission_user_create = namespace.add_permission(
-    name='user_create', label=_('Create new users')
+    label=_('Create new users'), name='user_create'
 )
 permission_user_delete = namespace.add_permission(
-    name='user_delete', label=_('Delete existing users')
+    label=_('Delete existing users'), name='user_delete'
 )
 permission_user_edit = namespace.add_permission(
-    name='user_edit', label=_('Edit existing users')
+    label=_('Edit existing users'), name='user_edit'
 )
 permission_user_view = namespace.add_permission(
-    name='user_view', label=_('View existing users')
+    label=_('View existing users'), name='user_view'
 )
diff --git a/mayan/apps/user_management/search.py b/mayan/apps/user_management/search.py
index 54e7a26dc2..6ebf50546b 100644
--- a/mayan/apps/user_management/search.py
+++ b/mayan/apps/user_management/search.py
@@ -12,7 +12,7 @@ user_app, user_model = settings.AUTH_USER_MODEL.split('.')
 user_search = SearchModel(
     app_label=user_app, model_name=user_model,
     permission=permission_user_view,
-    serializer_string='mayan.apps.user_management.serializers.UserSerializer'
+    serializer_path='mayan.apps.user_management.serializers.UserSerializer'
 )
 
 user_search.add_model_field(
@@ -34,7 +34,7 @@ user_search.add_model_field(
 group_search = SearchModel(
     app_label='auth', model_name='Group',
     permission=permission_group_view,
-    serializer_string='user_management.serializers.GroupSerializer'
+    serializer_path='user_management.serializers.GroupSerializer'
 )
 
 group_search.add_model_field(
diff --git a/mayan/apps/user_management/serializers.py b/mayan/apps/user_management/serializers.py
index 559b2c6969..1f5b5e4411 100644
--- a/mayan/apps/user_management/serializers.py
+++ b/mayan/apps/user_management/serializers.py
@@ -44,8 +44,8 @@ class UserGroupListSerializer(serializers.Serializer):
             for group in Group.objects.filter(pk__in=pk_list):
                 try:
                     AccessControlList.objects.check_access(
-                        permissions=(permission_group_view,),
-                        user=self.context['request'].user, obj=group
+                        obj=group, permissions=(permission_group_view,),
+                        user=self.context['request'].user
                     )
                 except PermissionDenied:
                     pass
diff --git a/mayan/apps/user_management/views.py b/mayan/apps/user_management/views.py
index 843205d5e9..1af125bfea 100644
--- a/mayan/apps/user_management/views.py
+++ b/mayan/apps/user_management/views.py
@@ -35,15 +35,15 @@ class CurrentUserDetailsView(SingleObjectDetailView):
         'date_joined', 'groups'
     )
 
-    def get_object(self):
-        return self.request.user
-
     def get_extra_context(self, **kwargs):
         return {
             'object': None,
             'title': _('Current user details'),
         }
 
+    def get_object(self):
+        return self.request.user
+
 
 class CurrentUserEditView(SingleObjectEditView):
     extra_context = {'object': None, 'title': _('Edit current user details')}
@@ -69,6 +69,20 @@ class GroupCreateView(SingleObjectCreateView):
         return {'_user': self.request.user}
 
 
+class GroupDeleteView(SingleObjectDeleteView):
+    model = Group
+    object_permission = permission_group_delete
+    post_action_redirect = reverse_lazy(
+        viewname='user_management:group_list'
+    )
+
+    def get_extra_context(self):
+        return {
+            'object': self.get_object(),
+            'title': _('Delete the group: %s?') % self.get_object(),
+        }
+
+
 class GroupEditView(SingleObjectEditView):
     fields = ('name',)
     model = Group
@@ -111,20 +125,6 @@ class GroupListView(SingleObjectListView):
         }
 
 
-class GroupDeleteView(SingleObjectDeleteView):
-    model = Group
-    object_permission = permission_group_delete
-    post_action_redirect = reverse_lazy(
-        viewname='user_management:group_list'
-    )
-
-    def get_extra_context(self):
-        return {
-            'object': self.get_object(),
-            'title': _('Delete the group: %s?') % self.get_object(),
-        }
-
-
 class GroupUsersView(AddRemoveView):
     action_add_method = 'users_add'
     action_remove_method = 'users_remove'