diff --git a/mayan/apps/acls/tests/test_links.py b/mayan/apps/acls/tests/test_links.py
index 633323a77d..16bb0e848a 100644
--- a/mayan/apps/acls/tests/test_links.py
+++ b/mayan/apps/acls/tests/test_links.py
@@ -1,7 +1,7 @@
 from __future__ import unicode_literals
 
 from django.contrib.contenttypes.models import ContentType
-from django.urls import resolve, reverse
+from django.urls import reverse
 
 from documents.tests.test_views import GenericDocumentViewTestCase
 from user_management.tests.literals import (
diff --git a/mayan/apps/authentication/views.py b/mayan/apps/authentication/views.py
index 9cfc727c25..b135828e0a 100644
--- a/mayan/apps/authentication/views.py
+++ b/mayan/apps/authentication/views.py
@@ -83,7 +83,7 @@ def password_reset_complete_view(request):
 
     return password_reset_complete(
         request, extra_context=extra_context,
-        template_name= 'authentication/password_reset_complete.html'
+        template_name='authentication/password_reset_complete.html'
     )
 
 
diff --git a/mayan/apps/common/apps.py b/mayan/apps/common/apps.py
index cd5265e0c8..59f8795327 100644
--- a/mayan/apps/common/apps.py
+++ b/mayan/apps/common/apps.py
@@ -2,7 +2,6 @@ from __future__ import absolute_import, unicode_literals
 
 from datetime import timedelta
 import logging
-import os
 
 from kombu import Exchange, Queue
 
diff --git a/mayan/apps/common/generics.py b/mayan/apps/common/generics.py
index c8142852cb..9837d34b4a 100644
--- a/mayan/apps/common/generics.py
+++ b/mayan/apps/common/generics.py
@@ -20,7 +20,7 @@ from django_downloadview import (
 )
 from pure_pagination.mixins import PaginationMixin
 
-from .forms import ChoiceForm, DynamicForm
+from .forms import ChoiceForm
 from .mixins import (
     DeleteExtraDataMixin, DynamicFormViewMixin, ExtraContextMixin,
     FormExtraKwargsMixin, MultipleObjectMixin, ObjectActionMixin,
diff --git a/mayan/apps/common/management/commands/initialsetup.py b/mayan/apps/common/management/commands/initialsetup.py
index 92abda7fde..2a91f83991 100644
--- a/mayan/apps/common/management/commands/initialsetup.py
+++ b/mayan/apps/common/management/commands/initialsetup.py
@@ -1,7 +1,6 @@
 from __future__ import unicode_literals
 
 from django.core import management
-from django.db.utils import OperationalError
 
 from ...signals import post_initial_setup, pre_initial_setup
 
diff --git a/mayan/apps/common/management/commands/performupgrade.py b/mayan/apps/common/management/commands/performupgrade.py
index 2b33143d74..9e78fa6e8b 100644
--- a/mayan/apps/common/management/commands/performupgrade.py
+++ b/mayan/apps/common/management/commands/performupgrade.py
@@ -30,6 +30,3 @@ class Command(management.BaseCommand):
             raise CommandError(
                 'Error during post_upgrade signal; %s' % exception
             )
-
-
-
diff --git a/mayan/apps/common/signals.py b/mayan/apps/common/signals.py
index cc1cb3a666..21e7890310 100644
--- a/mayan/apps/common/signals.py
+++ b/mayan/apps/common/signals.py
@@ -7,4 +7,3 @@ post_initial_setup = Signal(use_caching=True)
 post_upgrade = Signal(use_caching=True)
 pre_initial_setup = Signal(use_caching=True)
 pre_upgrade = Signal(use_caching=True)
-
diff --git a/mayan/apps/document_states/models.py b/mayan/apps/document_states/models.py
index 10d17b57d1..29f52ff283 100644
--- a/mayan/apps/document_states/models.py
+++ b/mayan/apps/document_states/models.py
@@ -141,10 +141,10 @@ class WorkflowState(models.Model):
                     'workflow_instance', flat=True
                 )
             ) | Q(
-                    workflows__log_entries__isnull=True,
-                    workflows__workflow__states=self,
-                    workflows__workflow__states__initial=True
-                )
+                workflows__log_entries__isnull=True,
+                workflows__workflow__states=self,
+                workflows__workflow__states__initial=True
+            )
         ).distinct()
 
 
diff --git a/mayan/apps/documents/migrations/0039_duplicateddocument.py b/mayan/apps/documents/migrations/0039_duplicateddocument.py
index a7d944837f..c2e7cc0c97 100644
--- a/mayan/apps/documents/migrations/0039_duplicateddocument.py
+++ b/mayan/apps/documents/migrations/0039_duplicateddocument.py
@@ -19,19 +19,22 @@ class Migration(migrations.Migration):
                 (
                     'id', models.AutoField(
                         auto_created=True, primary_key=True, serialize=False,
-                        verbose_name='ID')
-                    ),
+                        verbose_name='ID'
+                    )
+                ),
                 (
                     'datetime_added', models.DateTimeField(
                         auto_now_add=True, db_index=True,
-                        verbose_name='Added')
-                    ),
+                        verbose_name='Added'
+                    )
+                ),
                 (
                     'document', models.ForeignKey(
                         on_delete=django.db.models.deletion.CASCADE,
                         related_name='duplicates', to='documents.Document',
-                        verbose_name='Document')
-                    ),
+                        verbose_name='Document'
+                    )
+                ),
                 (
                     'documents', models.ManyToManyField(
                         to='documents.Document',
diff --git a/mayan/apps/documents/tests/test_views.py b/mayan/apps/documents/tests/test_views.py
index d84056ab99..f0b62bcd5d 100644
--- a/mayan/apps/documents/tests/test_views.py
+++ b/mayan/apps/documents/tests/test_views.py
@@ -33,6 +33,7 @@ from .literals import (
     TEST_TRANSFORMATION_NAME, TEST_VERSION_COMMENT
 )
 
+
 @override_settings(OCR_AUTO_OCR=False)
 class GenericDocumentViewTestCase(GenericViewTestCase):
     def setUp(self):
@@ -606,7 +607,7 @@ class DocumentTypeViewsTestCase(GenericDocumentViewTestCase):
         # Grant the document type view permission so that the post create
         # redirect works
         self.grant_permission(permission=permission_document_type_view)
-        response = self._request_document_type_create()
+        self._request_document_type_create()
 
         self.assertEqual(DocumentType.objects.count(), 0)
 
@@ -669,7 +670,7 @@ class DocumentTypeViewsTestCase(GenericDocumentViewTestCase):
         )
 
     def test_document_type_edit_view_no_permission(self):
-        response = self._request_document_type_edit()
+        self._request_document_type_edit()
 
         self.assertEqual(
             DocumentType.objects.get(pk=self.document_type.pk).label,
@@ -781,7 +782,7 @@ class DocumentTypeViewsTestCase(GenericDocumentViewTestCase):
         self.grant_access(
             obj=self.document_type, permission=permission_document_type_view
         )
-        response = self._request_quick_label_delete()
+        self._request_quick_label_delete()
 
         self.assertEqual(
             self.document_type.filenames.count(), 1
@@ -807,6 +808,7 @@ class DocumentTypeViewsTestCase(GenericDocumentViewTestCase):
             self.document_type.filenames.count(), 0
         )
 
+
 class DocumentVersionTestCase(GenericDocumentViewTestCase):
     def setUp(self):
         super(DocumentVersionTestCase, self).setUp()
diff --git a/mayan/apps/documents/views/document_version_views.py b/mayan/apps/documents/views/document_version_views.py
index 2faefe9ae5..4140b262db 100644
--- a/mayan/apps/documents/views/document_version_views.py
+++ b/mayan/apps/documents/views/document_version_views.py
@@ -12,7 +12,7 @@ from common.generics import ConfirmView, SingleObjectListView
 from ..models import Document, DocumentVersion
 from ..permissions import (
     permission_document_download, permission_document_version_revert,
-    permission_document_version_view, permission_document_view
+    permission_document_version_view
 )
 
 from .document_views import DocumentDownloadFormView, DocumentDownloadView
diff --git a/mayan/apps/dynamic_search/serializers.py b/mayan/apps/dynamic_search/serializers.py
index 28ba7a954f..09c2442dff 100644
--- a/mayan/apps/dynamic_search/serializers.py
+++ b/mayan/apps/dynamic_search/serializers.py
@@ -2,8 +2,6 @@ from __future__ import unicode_literals
 
 from rest_framework import serializers
 
-from .classes import SearchField, SearchModel
-
 
 class SearchFieldSerializer(serializers.Serializer):
     field = serializers.CharField(read_only=True)
diff --git a/mayan/apps/lock_manager/backends/model_lock.py b/mayan/apps/lock_manager/backends/model_lock.py
index ff863f60c2..6ef8f5a97e 100644
--- a/mayan/apps/lock_manager/backends/model_lock.py
+++ b/mayan/apps/lock_manager/backends/model_lock.py
@@ -11,7 +11,7 @@ class ModelLock(LockingBackend):
         super(ModelLock, cls).acquire_lock(name=name, timeout=timeout)
         Lock = apps.get_model(app_label='lock_manager', model_name='Lock')
         return ModelLock(
-            model_instance = Lock.objects.acquire_lock(
+            model_instance=Lock.objects.acquire_lock(
                 name=name, timeout=timeout
             )
         )
diff --git a/mayan/apps/mailer/mailers.py b/mayan/apps/mailer/mailers.py
index 2878fbe4bd..6b5b74657e 100644
--- a/mayan/apps/mailer/mailers.py
+++ b/mayan/apps/mailer/mailers.py
@@ -16,7 +16,7 @@ class DjangoSMTP(MailerBackend):
             'help_text': _('The host to use for sending email.'),
             'kwargs': {
                 'max_length': 48
-            },  'required': False
+            }, 'required': False
         },
         {
             'name': 'port', 'label': _('Port'),
diff --git a/mayan/apps/metadata/widgets.py b/mayan/apps/metadata/widgets.py
index a70540577f..8e4a428069 100644
--- a/mayan/apps/metadata/widgets.py
+++ b/mayan/apps/metadata/widgets.py
@@ -1,4 +1,5 @@
 from __future__ import unicode_literals
+
 from django.utils.html import format_html_join
 
 
@@ -8,7 +9,9 @@ def get_metadata_string(document):
     """
     return format_html_join(
         '\n', '<div class="metadata-display"><b>{}: </b><span data-metadata-type="{}" data-pk="{}">{}</span></div>',
-        ((document_metadata.metadata_type,document_metadata.metadata_type_id,document_metadata.id,document_metadata.value)
-            for document_metadata in document.metadata.all()
+        (
+            (
+                document_metadata.metadata_type, document_metadata.metadata_type_id, document_metadata.id, document_metadata.value
+            ) for document_metadata in document.metadata.all()
         )
     )
diff --git a/mayan/apps/mirroring/management/commands/mountindex.py b/mayan/apps/mirroring/management/commands/mountindex.py
index 2a57b9b948..fa5dd98a23 100644
--- a/mayan/apps/mirroring/management/commands/mountindex.py
+++ b/mayan/apps/mirroring/management/commands/mountindex.py
@@ -240,7 +240,7 @@ class Command(management.BaseCommand):
                 allow_other=options['allow_other'],
                 allow_root=options['allow_root']
             )
-        except RuntimeError as exception:
+        except RuntimeError:
             if options['allow_other'] or options['allow_root']:
                 raise CommandError(
                     'Make sure \'user_allow_other\' is set in /etc/fuse.conf'
diff --git a/mayan/apps/ocr/tests/test_views.py b/mayan/apps/ocr/tests/test_views.py
index 0c67c5041d..41b0462103 100644
--- a/mayan/apps/ocr/tests/test_views.py
+++ b/mayan/apps/ocr/tests/test_views.py
@@ -1,7 +1,6 @@
 from __future__ import unicode_literals
 
 from django.test import override_settings
-from django.utils.encoding import force_text
 
 from documents.tests.test_views import GenericDocumentViewTestCase
 
diff --git a/mayan/apps/ocr/utils.py b/mayan/apps/ocr/utils.py
index b2b9d19a03..8175c3040e 100644
--- a/mayan/apps/ocr/utils.py
+++ b/mayan/apps/ocr/utils.py
@@ -3,6 +3,8 @@ from __future__ import unicode_literals
 from django.utils.encoding import force_text
 from django.utils.html import conditional_escape
 
+from .models import DocumentPageContent
+
 
 def get_document_ocr_content(document):
     for page in document.pages.all():
diff --git a/mayan/apps/permissions/serializers.py b/mayan/apps/permissions/serializers.py
index 02db390840..7449079d2d 100644
--- a/mayan/apps/permissions/serializers.py
+++ b/mayan/apps/permissions/serializers.py
@@ -60,8 +60,6 @@ class WritableRoleSerializer(serializers.HyperlinkedModelSerializer):
         model = Role
 
     def create(self, validated_data):
-        result = validated_data.copy()
-
         self.groups_pk_list = validated_data.pop('groups_pk_list', '')
         self.permissions_pk_list = validated_data.pop(
             'permissions_pk_list', ''
diff --git a/mayan/apps/sources/models.py b/mayan/apps/sources/models.py
index 47d17f4241..f2c4a6f2dc 100644
--- a/mayan/apps/sources/models.py
+++ b/mayan/apps/sources/models.py
@@ -126,7 +126,6 @@ class Source(models.Model):
                 document.delete(to_trash=False)
                 raise
 
-
     def handle_upload(self, file_object, description=None, document_type=None, expand=False, label=None, language=None, metadata_dict_list=None, metadata_dictionary=None, user=None):
         if not document_type:
             document_type = self.document_type
diff --git a/mayan/apps/sources/tests/test_views.py b/mayan/apps/sources/tests/test_views.py
index 9ef431c228..687d726d7b 100644
--- a/mayan/apps/sources/tests/test_views.py
+++ b/mayan/apps/sources/tests/test_views.py
@@ -12,7 +12,7 @@ from common.utils import fs_cleanup, mkdtemp
 from documents.models import Document, DocumentType
 from documents.permissions import permission_document_create
 from documents.tests import (
-    TEST_DOCUMENT_DESCRIPTION, TEST_SMALL_DOCUMENT_PATH, TEST_DOCUMENT_TYPE_LABEL,
+    TEST_DOCUMENT_DESCRIPTION, TEST_DOCUMENT_TYPE_LABEL,
     TEST_SMALL_DOCUMENT_CHECKSUM, TEST_SMALL_DOCUMENT_PATH
 )
 from documents.tests.test_views import GenericDocumentViewTestCase
diff --git a/mayan/apps/tags/widgets.py b/mayan/apps/tags/widgets.py
index 1256993ec7..4999c713c9 100644
--- a/mayan/apps/tags/widgets.py
+++ b/mayan/apps/tags/widgets.py
@@ -3,7 +3,6 @@ from __future__ import absolute_import, unicode_literals
 from django import forms
 from django.apps import apps
 from django.template.loader import render_to_string
-from django.utils.html import escape
 from django.utils.encoding import force_text
 from django.utils.html import format_html
 from django.utils.safestring import mark_safe