diff --git a/mayan/apps/converter/backends/python.py b/mayan/apps/converter/backends/python.py
index 95778f27df..f3c849a4cd 100644
--- a/mayan/apps/converter/backends/python.py
+++ b/mayan/apps/converter/backends/python.py
@@ -2,7 +2,6 @@ from __future__ import absolute_import
 
 import io
 import logging
-import os
 import tempfile
 
 import slate
diff --git a/mayan/apps/document_indexing/__init__.py b/mayan/apps/document_indexing/__init__.py
index e9d71c51f3..d681f65696 100644
--- a/mayan/apps/document_indexing/__init__.py
+++ b/mayan/apps/document_indexing/__init__.py
@@ -1,6 +1,6 @@
 from __future__ import absolute_import
 
-from django.db.models.signals import post_save, pre_delete, post_delete
+from django.db.models.signals import post_save, post_delete
 from django.dispatch import receiver
 from django.utils.translation import ugettext_lazy as _
 
diff --git a/mayan/apps/document_indexing/api.py b/mayan/apps/document_indexing/api.py
index b282c43b12..e85de16504 100644
--- a/mayan/apps/document_indexing/api.py
+++ b/mayan/apps/document_indexing/api.py
@@ -3,7 +3,6 @@ from __future__ import absolute_import
 import logging
 
 from django.db.models import Q
-from django.utils.translation import ugettext
 from django.utils.translation import ugettext_lazy as _
 
 from .models import Index, IndexInstanceNode
diff --git a/mayan/apps/document_indexing/serializers.py b/mayan/apps/document_indexing/serializers.py
index e8ecb5a7af..25880f427e 100644
--- a/mayan/apps/document_indexing/serializers.py
+++ b/mayan/apps/document_indexing/serializers.py
@@ -27,7 +27,7 @@ class IndexTemplateNodeSerializer(serializers.ModelSerializer):
 
 class IndexSerializer(serializers.ModelSerializer):
     node_templates = IndexTemplateNodeSerializer(read_only=True, many=True)
-    instance_root = IndexInstanceNodeSerializer(read_only=True)#, many=False)
+    instance_root = IndexInstanceNodeSerializer(read_only=True)
 
     class Meta:
         fields = ('id', 'name', 'title', 'enabled', 'document_types', 'node_templates', 'instance_root')
diff --git a/mayan/apps/document_indexing/settings.py b/mayan/apps/document_indexing/settings.py
index 81feb424eb..891bd71039 100644
--- a/mayan/apps/document_indexing/settings.py
+++ b/mayan/apps/document_indexing/settings.py
@@ -1,7 +1,5 @@
 """Configuration options for the document_indexing app"""
 
-from django.utils.translation import ugettext_lazy as _
-
 from smart_settings.api import register_settings
 
 available_indexing_functions = {
diff --git a/mayan/apps/document_indexing/tests.py b/mayan/apps/document_indexing/tests.py
index 9925e71b8a..49458682de 100644
--- a/mayan/apps/document_indexing/tests.py
+++ b/mayan/apps/document_indexing/tests.py
@@ -1,29 +1,18 @@
 from __future__ import absolute_import
 
-from json import loads
-import os
-
-from django.conf import settings
-from django.contrib.auth.models import User
 from django.core.files.base import File
-from django.core.urlresolvers import reverse
-from django.test.client import Client
 from django.test import TestCase
 
-from rest_framework import status
-from rest_framework.test import APIClient
-
 from documents.models import Document, DocumentType
-from documents.tests import (TEST_SMALL_DOCUMENT_PATH, TEST_DOCUMENT_DESCRIPTION,
-                             TEST_DOCUMENT_TYPE)
-from metadata.models import (MetadataType, DocumentMetadata,
-                             DocumentTypeMetadataType)
+from documents.tests import TEST_SMALL_DOCUMENT_PATH, TEST_DOCUMENT_TYPE
+from metadata.models import MetadataType, DocumentTypeMetadataType
+
 from .models import Index, IndexInstanceNode, IndexTemplateNode
 
 
 class IndexTestCase(TestCase):
     def setUp(self):
-        self.document_type = DocumentType.objects.create(name=TEST_DOCUMENT_DESCRIPTION)
+        self.document_type = DocumentType.objects.create(name=TEST_DOCUMENT_TYPE)
 
         with open(TEST_SMALL_DOCUMENT_PATH) as file_object:
             self.document = Document.objects.new_document(file_object=File(file_object), document_type=self.document_type)[0].document
diff --git a/mayan/apps/documents/views.py b/mayan/apps/documents/views.py
index 76755a53e9..b6b6d2c3b4 100644
--- a/mayan/apps/documents/views.py
+++ b/mayan/apps/documents/views.py
@@ -45,7 +45,6 @@ from .permissions import (PERMISSION_DOCUMENT_PROPERTIES_EDIT,
                           PERMISSION_DOCUMENT_VERSION_REVERT, PERMISSION_DOCUMENT_TYPE_EDIT,
                           PERMISSION_DOCUMENT_TYPE_DELETE, PERMISSION_DOCUMENT_TYPE_CREATE,
                           PERMISSION_DOCUMENT_TYPE_VIEW)
-from .runtime import storage_backend
 from .settings import (PREVIEW_SIZE, RECENT_COUNT, ROTATION_STEP,
                        ZOOM_PERCENT_STEP, ZOOM_MAX_LEVEL, ZOOM_MIN_LEVEL)
 from .tasks import (task_clear_image_cache, task_get_document_image,
@@ -100,7 +99,6 @@ def document_properties(request, document_id):
 
     document.add_as_recent_document_for_user(request.user)
 
-
     document_fields = [
         {'label': _(u'Date added'), 'field': lambda x: x.date_added.date()},
         {'label': _(u'Time added'), 'field': lambda x: unicode(x.date_added.time()).split('.')[0]},
diff --git a/mayan/apps/documents/widgets.py b/mayan/apps/documents/widgets.py
index 67d51f23b2..2c3914bd67 100644
--- a/mayan/apps/documents/widgets.py
+++ b/mayan/apps/documents/widgets.py
@@ -45,7 +45,6 @@ class DocumentPagesCarouselWidget(forms.widgets.Widget):
 
         # Reuse expensive values
         latest_version_pk = value.latest_version.pk
-        page_count = value.page_count
 
         for page in document_pages:
             output.append(u'<div style="margin: 5px 10px 10px 10px;">')
diff --git a/mayan/apps/dynamic_search/tests.py b/mayan/apps/dynamic_search/tests.py
index 28b577067b..20f9bbba81 100644
--- a/mayan/apps/dynamic_search/tests.py
+++ b/mayan/apps/dynamic_search/tests.py
@@ -9,11 +9,7 @@ from django.core.urlresolvers import reverse
 from django.test.client import Client
 from django.test import TestCase
 
-from rest_framework import status
-from rest_framework.test import APIClient
-
 from documents.models import Document, DocumentType
-from ocr.parsers import parse_document_page
 
 from .classes import SearchModel
 
diff --git a/mayan/apps/dynamic_search/views.py b/mayan/apps/dynamic_search/views.py
index 95e2665774..c0b266b8c6 100644
--- a/mayan/apps/dynamic_search/views.py
+++ b/mayan/apps/dynamic_search/views.py
@@ -3,19 +3,14 @@ from __future__ import absolute_import
 import logging
 import urlparse
 
-from django.core.exceptions import PermissionDenied
 from django.core.urlresolvers import reverse
 from django.http import HttpResponseRedirect
 from django.shortcuts import render_to_response
 from django.template import RequestContext
 from django.utils.translation import ugettext_lazy as _
 
-from acls.models import AccessEntry
-from permissions.models import Permission
-
 from .classes import SearchModel
 from .forms import SearchForm, AdvancedSearchForm
-from .models import RecentSearch
 from .settings import LIMIT, SHOW_OBJECT_TYPE
 
 logger = logging.getLogger(__name__)
diff --git a/mayan/apps/installation/literals.py b/mayan/apps/installation/literals.py
index 49392c0d56..685d69c302 100644
--- a/mayan/apps/installation/literals.py
+++ b/mayan/apps/installation/literals.py
@@ -1,8 +1,3 @@
-import os
-
-from django.conf import settings
-
-
 FORM_SUBMIT_URL = 'https://docs.google.com/spreadsheet/formResponse'
 FORM_KEY = 'dGZrYkw3SDl5OENMTG15emp1UFFEUWc6MQ'
 FORM_RECEIVER_FIELD = 'entry.0.single'
diff --git a/mayan/apps/lock_manager/__init__.py b/mayan/apps/lock_manager/__init__.py
index 61fe7fbf78..0f834c7d6b 100644
--- a/mayan/apps/lock_manager/__init__.py
+++ b/mayan/apps/lock_manager/__init__.py
@@ -1,6 +1,6 @@
 from __future__ import absolute_import
 
-from .exceptions import LockError
+from .exceptions import LockError  # NOQA
 from .models import Lock as LockModel
 
 Lock = LockModel.objects
diff --git a/mayan/apps/metadata/classes.py b/mayan/apps/metadata/classes.py
index 49bf81d41c..467b8e1c9e 100644
--- a/mayan/apps/metadata/classes.py
+++ b/mayan/apps/metadata/classes.py
@@ -1,7 +1,6 @@
 from django.utils.translation import ugettext_lazy as _
 
-from .models import DocumentTypeMetadataType, MetadataType
-from .tasks import task_add_required_metadata_type, task_remove_metadata_type
+from .models import MetadataType
 
 
 class DocumentMetadataHelper(object):
diff --git a/mayan/apps/metadata/forms.py b/mayan/apps/metadata/forms.py
index 5313f3bddd..dc0bdbe79f 100644
--- a/mayan/apps/metadata/forms.py
+++ b/mayan/apps/metadata/forms.py
@@ -85,4 +85,5 @@ MetadataRemoveFormSet = formset_factory(MetadataRemoveForm, extra=0)
 
 class MetadataTypeForm(forms.ModelForm):
     class Meta:
+        fields = ('name', 'title', 'default', 'lookup')
         model = MetadataType
diff --git a/mayan/apps/ocr/tests.py b/mayan/apps/ocr/tests.py
index 1c7f266de1..a6f48f4c4a 100644
--- a/mayan/apps/ocr/tests.py
+++ b/mayan/apps/ocr/tests.py
@@ -1,13 +1,11 @@
 from __future__ import absolute_import
 
-from django.conf import settings
 from django.core.files.base import File
 from django.test import TransactionTestCase
 
 from documents.models import Document, DocumentType
 from documents.tests import TEST_SMALL_DOCUMENT_PATH, TEST_DOCUMENT_TYPE
 
-from .api import do_document_ocr
 from .models import DocumentQueue, QueueDocument
 
 
diff --git a/mayan/apps/permissions/forms.py b/mayan/apps/permissions/forms.py
index b0a6a89008..64cd5dd5df 100644
--- a/mayan/apps/permissions/forms.py
+++ b/mayan/apps/permissions/forms.py
@@ -9,9 +9,11 @@ from .models import Role
 
 class RoleForm(forms.ModelForm):
     class Meta:
+        fields = ('name', 'label')
         model = Role
 
 
 class RoleForm_view(DetailForm):
     class Meta:
+        fields = ('name', 'label')
         model = Role
diff --git a/mayan/apps/user_management/api_views.py b/mayan/apps/user_management/api_views.py
index 876e72e482..780551e684 100644
--- a/mayan/apps/user_management/api_views.py
+++ b/mayan/apps/user_management/api_views.py
@@ -2,8 +2,7 @@ from __future__ import absolute_import
 
 from django.contrib.auth.models import Group, User
 
-from rest_framework import generics, views
-from rest_framework.response import Response
+from rest_framework import generics
 
 from rest_api.filters import MayanObjectPermissionsFilter
 from rest_api.permissions import MayanPermission