diff --git a/contrib/scripts/process_messages.py b/contrib/scripts/process_messages.py
index 01fde2e155..b0069300ee 100755
--- a/contrib/scripts/process_messages.py
+++ b/contrib/scripts/process_messages.py
@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-import sys
 import os
 import optparse
 
diff --git a/manage.py b/manage.py
index 47a0084392..c8d9c5d18b 100755
--- a/manage.py
+++ b/manage.py
@@ -8,4 +8,3 @@ if __name__ == "__main__":
     from django.core.management import execute_from_command_line
 
     execute_from_command_line(sys.argv)
-
diff --git a/mayan/apps/appearance/apps.py b/mayan/apps/appearance/apps.py
index 44382f33e2..8a6c0608a7 100644
--- a/mayan/apps/appearance/apps.py
+++ b/mayan/apps/appearance/apps.py
@@ -1,6 +1,5 @@
 from __future__ import unicode_literals
 
-from django import apps
 from django.utils.translation import ugettext_lazy as _
 
 from common import MayanAppConfig
diff --git a/mayan/apps/checkouts/tests/test_models.py b/mayan/apps/checkouts/tests/test_models.py
index aaf87bce80..72f8fb03b5 100644
--- a/mayan/apps/checkouts/tests/test_models.py
+++ b/mayan/apps/checkouts/tests/test_models.py
@@ -13,7 +13,7 @@ from authentication.tests.literals import (
 )
 from documents.models import DocumentType
 from documents.tests.literals import (
-    TEST_DOCUMENT_TYPE, TEST_DOCUMENT_PATH, TEST_SMALL_DOCUMENT_PATH
+    TEST_DOCUMENT_TYPE, TEST_SMALL_DOCUMENT_PATH
 )
 
 from ..exceptions import (
diff --git a/mayan/apps/common/tests/test_views.py b/mayan/apps/common/tests/test_views.py
index c4ded1802a..c3ce3f6ed4 100644
--- a/mayan/apps/common/tests/test_views.py
+++ b/mayan/apps/common/tests/test_views.py
@@ -7,8 +7,7 @@ from django.test.client import Client
 from django.test import TestCase
 
 from documents.tests.literals import (
-    TEST_ADMIN_PASSWORD, TEST_ADMIN_USERNAME, TEST_ADMIN_EMAIL,
-    TEST_SMALL_DOCUMENT_PATH, TEST_DOCUMENT_TYPE
+    TEST_ADMIN_PASSWORD, TEST_ADMIN_USERNAME, TEST_ADMIN_EMAIL
 )
 
 
diff --git a/mayan/apps/common/views.py b/mayan/apps/common/views.py
index 95c3e4ad64..a094c17136 100644
--- a/mayan/apps/common/views.py
+++ b/mayan/apps/common/views.py
@@ -159,10 +159,10 @@ class PackagesLicensesView(SimpleView):
         # Use a function so that PackagesLicensesForm get initialized at every
         # request
         return {
-        'form': PackagesLicensesForm(),
-        'read_only': True,
-        'title': _('Other packages licenses'),
-    }
+            'form': PackagesLicensesForm(),
+            'read_only': True,
+            'title': _('Other packages licenses'),
+        }
 
 
 class SetupListView(TemplateView):
diff --git a/mayan/apps/converter/classes.py b/mayan/apps/converter/classes.py
index 763cbca155..11922d0cfe 100644
--- a/mayan/apps/converter/classes.py
+++ b/mayan/apps/converter/classes.py
@@ -2,7 +2,6 @@ from __future__ import unicode_literals
 
 import logging
 import os
-import subprocess
 import tempfile
 
 try:
@@ -131,7 +130,7 @@ class ConverterBase(object):
         if self.mime_type == 'text/plain':
             libreoffice_filter = 'Text (encoded):UTF8,LF,,,'
 
-        args=(input_filepath, '--outdir', setting_temporary_directory.value)
+        args = (input_filepath, '--outdir', setting_temporary_directory.value)
 
         kwargs = {'_env': {'HOME': setting_temporary_directory.value}}
 
diff --git a/mayan/apps/converter/models.py b/mayan/apps/converter/models.py
index 00d4a538c5..3f27dab0ad 100644
--- a/mayan/apps/converter/models.py
+++ b/mayan/apps/converter/models.py
@@ -28,18 +28,20 @@ class Transformation(models.Model):
     content_object = generic.GenericForeignKey('content_type', 'object_id')
 
     order = models.PositiveIntegerField(
-        blank=True, db_index=True, default=0,
-        help_text=_('Order in which the transformations will be executed. If left unchanged, an automatic order value will be assigned.'),
-        verbose_name=_('Order')
+        blank=True, db_index=True, default=0, help_text=_(
+            'Order in which the transformations will be executed. If left '
+            'unchanged, an automatic order value will be assigned.'
+        ), verbose_name=_('Order')
     )
     name = models.CharField(
         choices=BaseTransformation.get_transformation_choices(),
         max_length=128, verbose_name=_('Name')
     )
     arguments = models.TextField(
-        blank=True,
-        help_text=_('Enter the arguments for the transformation as a YAML dictionary. ie: {"degrees": 180}'),
-        validators=[YAMLValidator()], verbose_name=_('Arguments')
+        blank=True, help_text=_(
+            'Enter the arguments for the transformation as a YAML '
+            'dictionary. ie: {"degrees": 180}'
+        ), validators=[YAMLValidator()], verbose_name=_('Arguments')
     )
 
     objects = TransformationManager()
diff --git a/mayan/apps/document_indexing/migrations/0010_documentindexinstancenode_indexinstance.py b/mayan/apps/document_indexing/migrations/0010_documentindexinstancenode_indexinstance.py
index 706ff6d0ae..e9368591fb 100644
--- a/mayan/apps/document_indexing/migrations/0010_documentindexinstancenode_indexinstance.py
+++ b/mayan/apps/document_indexing/migrations/0010_documentindexinstancenode_indexinstance.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import models, migrations
+from django.db import migrations
 
 
 class Migration(migrations.Migration):
diff --git a/mayan/apps/documents/models.py b/mayan/apps/documents/models.py
index 8a3c66c57f..d2a11ba5ff 100644
--- a/mayan/apps/documents/models.py
+++ b/mayan/apps/documents/models.py
@@ -3,7 +3,6 @@ from __future__ import unicode_literals
 import base64
 import hashlib
 import logging
-import os
 import uuid
 
 from django.contrib.auth.models import User
@@ -15,7 +14,6 @@ from django.utils.timezone import now
 from django.utils.translation import ugettext, ugettext_lazy as _
 
 from common.literals import TIME_DELTA_UNIT_CHOICES
-from common.settings import setting_temporary_directory
 from converter import (
     converter_class, TransformationResize, TransformationRotate,
     TransformationZoom
diff --git a/mayan/apps/documents/tasks.py b/mayan/apps/documents/tasks.py
index 11356f6755..616fdc01d4 100644
--- a/mayan/apps/documents/tasks.py
+++ b/mayan/apps/documents/tasks.py
@@ -15,9 +15,7 @@ from .literals import (
     UPDATE_PAGE_COUNT_RETRY_DELAY, UPLOAD_NEW_VERSION_RETRY_DELAY,
     NEW_DOCUMENT_RETRY_DELAY, STUB_EXPIRATION_INTERVAL
 )
-from .models import (
-    DeletedDocument, Document, DocumentPage, DocumentType, DocumentVersion
-)
+from .models import Document, DocumentPage, DocumentType, DocumentVersion
 
 logger = logging.getLogger(__name__)
 
diff --git a/mayan/apps/documents/tests/test_models.py b/mayan/apps/documents/tests/test_models.py
index 0a02871b2f..1d2919dcb6 100644
--- a/mayan/apps/documents/tests/test_models.py
+++ b/mayan/apps/documents/tests/test_models.py
@@ -5,8 +5,6 @@ import time
 from django.core.files import File
 from django.test import TestCase, override_settings
 
-from common.literals import TIME_DELTA_UNIT_DAYS
-
 from .literals import (
     TEST_DOCUMENT_TYPE, TEST_DOCUMENT_PATH, TEST_MULTI_PAGE_TIFF_PATH,
     TEST_OFFICE_DOCUMENT_PATH, TEST_SMALL_DOCUMENT_PATH
diff --git a/mayan/apps/dynamic_search/forms.py b/mayan/apps/dynamic_search/forms.py
index 7fbb43f87b..aa37ce1c48 100644
--- a/mayan/apps/dynamic_search/forms.py
+++ b/mayan/apps/dynamic_search/forms.py
@@ -17,4 +17,6 @@ class AdvancedSearchForm(forms.Form):
 
 
 class SearchForm(forms.Form):
-    q = forms.CharField(max_length=128, label=_('Search terms'), required=False)
+    q = forms.CharField(
+        max_length=128, label=_('Search terms'), required=False
+    )
diff --git a/mayan/apps/dynamic_search/models.py b/mayan/apps/dynamic_search/models.py
index d2495d34b3..9afc0c97dc 100644
--- a/mayan/apps/dynamic_search/models.py
+++ b/mayan/apps/dynamic_search/models.py
@@ -35,7 +35,9 @@ class RecentSearch(models.Model):
         from .classes import SearchModel
         document_search = SearchModel.get('documents.Document')
 
-        query_dict = urlparse.parse_qs(urllib.unquote_plus(smart_str(self.query)))
+        query_dict = urlparse.parse_qs(
+            urllib.unquote_plus(smart_str(self.query))
+        )
 
         if self.is_advanced():
             # Advanced search
diff --git a/mayan/apps/dynamic_search/serializers.py b/mayan/apps/dynamic_search/serializers.py
index 2f2b3178d0..0e49d1b9bf 100644
--- a/mayan/apps/dynamic_search/serializers.py
+++ b/mayan/apps/dynamic_search/serializers.py
@@ -8,7 +8,9 @@ from .models import RecentSearch
 
 
 class RecentSearchSerializer(serializers.HyperlinkedModelSerializer):
-    url = serializers.HyperlinkedIdentityField(view_name='rest_api:recentsearch-detail')
+    url = serializers.HyperlinkedIdentityField(
+        view_name='rest_api:recentsearch-detail'
+    )
     user = UserSerializer()
 
     class Meta:
diff --git a/mayan/apps/dynamic_search/views.py b/mayan/apps/dynamic_search/views.py
index 6cf24b8605..bceb6665bf 100644
--- a/mayan/apps/dynamic_search/views.py
+++ b/mayan/apps/dynamic_search/views.py
@@ -44,7 +44,9 @@ class ResultsView(SingleObjectListView):
             # Only do search if there is user input, otherwise just render
             # the template with the extra_context
 
-            queryset, ids, timedelta = document_search.search(self.request.GET, self.request.user)
+            queryset, ids, timedelta = document_search.search(
+                self.request.GET, self.request.user
+            )
 
             return queryset
 
diff --git a/mayan/apps/folders/migrations/0004_documentfolder.py b/mayan/apps/folders/migrations/0004_documentfolder.py
index ad0a7ced49..ecbd9b212d 100644
--- a/mayan/apps/folders/migrations/0004_documentfolder.py
+++ b/mayan/apps/folders/migrations/0004_documentfolder.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import models, migrations
+from django.db import migrations
 
 
 class Migration(migrations.Migration):
diff --git a/mayan/apps/mailer/views.py b/mayan/apps/mailer/views.py
index 5144323820..c74d602d7b 100644
--- a/mayan/apps/mailer/views.py
+++ b/mayan/apps/mailer/views.py
@@ -38,7 +38,9 @@ def send_document_link(request, document_id=None, document_id_list=None, as_atta
     if document_id:
         documents = [get_object_or_404(Document, pk=document_id)]
     elif document_id_list:
-        documents = [get_object_or_404(Document, pk=document_id) for document_id in document_id_list.split(',')]
+        documents = [
+            get_object_or_404(Document, pk=document_id) for document_id in document_id_list.split(',')
+        ]
 
     if as_attachment:
         permission = permission_mailing_send_document
@@ -48,15 +50,25 @@ def send_document_link(request, document_id=None, document_id_list=None, as_atta
     try:
         Permission.check_permissions(request.user, (permission,))
     except PermissionDenied:
-        documents = AccessControlList.objects.filter_by_access(permission, request.user, documents)
+        documents = AccessControlList.objects.filter_by_access(
+            permission, request.user, documents
+        )
 
     if not documents:
         messages.error(request, _('Must provide at least one document.'))
-        return HttpResponseRedirect(request.META.get('HTTP_REFERER', reverse(settings.LOGIN_REDIRECT_URL)))
+        return HttpResponseRedirect(
+            request.META.get(
+                'HTTP_REFERER', reverse(settings.LOGIN_REDIRECT_URL)
+            )
+        )
 
     post_action_redirect = reverse('documents:document_list_recent')
 
-    next = request.POST.get('next', request.GET.get('next', request.META.get('HTTP_REFERER', post_action_redirect)))
+    next = request.POST.get(
+        'next', request.GET.get(
+            'next', request.META.get('HTTP_REFERER', post_action_redirect)
+        )
+    )
 
     for document in documents:
         document.add_as_recent_document_for_user(request.user)
@@ -77,7 +89,15 @@ def send_document_link(request, document_id=None, document_id_list=None, as_atta
                 subject_template = Template(form.cleaned_data['subject'])
                 subject_text = strip_tags(subject_template.render(context))
 
-                task_send_document.apply_async(args=(subject_text, body_text_content, request.user.email, form.cleaned_data['email']), kwargs={'document_id': document.pk, 'as_attachment': as_attachment})
+                task_send_document.apply_async(
+                    args=(
+                        subject_text, body_text_content, request.user.email,
+                        form.cleaned_data['email']
+                    ), kwargs={
+                        'document_id': document.pk,
+                        'as_attachment': as_attachment
+                    }
+                )
 
             # TODO: Pluralize
             messages.success(request, _('Successfully queued for delivery via email.'))
@@ -103,5 +123,7 @@ def send_document_link(request, document_id=None, document_id_list=None, as_atta
         else:
             context['title'] = _('Email links for documents: %s') % ', '.join([unicode(d) for d in documents])
 
-    return render_to_response('appearance/generic_form.html', context,
-                              context_instance=RequestContext(request))
+    return render_to_response(
+        'appearance/generic_form.html', context,
+        context_instance=RequestContext(request)
+    )
diff --git a/mayan/apps/metadata/apps.py b/mayan/apps/metadata/apps.py
index 39c28f4cb7..197e735a26 100644
--- a/mayan/apps/metadata/apps.py
+++ b/mayan/apps/metadata/apps.py
@@ -137,7 +137,9 @@ class MetadataApp(MayanAppConfig):
         )
         SourceColumn(
             source=DocumentMetadata, label=_('Required'),
-            func=lambda context: two_state_template(context['object'].is_required)
+            func=lambda context: two_state_template(
+                context['object'].is_required
+            )
         )
 
         app.conf.CELERY_QUEUES.append(
diff --git a/mayan/apps/metadata/forms.py b/mayan/apps/metadata/forms.py
index 40a15bb90f..23503cc250 100644
--- a/mayan/apps/metadata/forms.py
+++ b/mayan/apps/metadata/forms.py
@@ -18,7 +18,9 @@ class MetadataForm(forms.Form):
             self.document_type = kwargs['initial'].pop('document_type', None)
             required_string = ''
 
-            required = self.metadata_type.get_required_for(document_type=self.document_type)
+            required = self.metadata_type.get_required_for(
+                document_type=self.document_type
+            )
             if required:
                 self.fields['value'].required = True
                 required_string = ' (%s)' % _('Required')
@@ -66,7 +68,9 @@ class MetadataForm(forms.Form):
                     )
 
     def clean_value(self):
-        return self.metadata_type.validate_value(document_type=self.document_type, value=self.cleaned_data['value'])
+        return self.metadata_type.validate_value(
+            document_type=self.document_type, value=self.cleaned_data['value']
+        )
 
     id = forms.CharField(label=_('ID'), widget=forms.HiddenInput)
 
diff --git a/mayan/apps/metadata/urls.py b/mayan/apps/metadata/urls.py
index 4468843a89..e0eea49a8a 100644
--- a/mayan/apps/metadata/urls.py
+++ b/mayan/apps/metadata/urls.py
@@ -18,7 +18,9 @@ from .views import (
 
 urlpatterns = patterns(
     'metadata.views',
-    url(r'^(?P<document_id>\d+)/edit/$', 'metadata_edit', name='metadata_edit'),
+    url(
+        r'^(?P<document_id>\d+)/edit/$', 'metadata_edit', name='metadata_edit'
+    ),
     url(
         r'^(?P<pk>\d+)/view/$', DocumentMetadataListView.as_view(),
         name='metadata_view'
diff --git a/mayan/apps/mimetype/apps.py b/mayan/apps/mimetype/apps.py
index 38f3f1758c..cbb878fc42 100644
--- a/mayan/apps/mimetype/apps.py
+++ b/mayan/apps/mimetype/apps.py
@@ -1,13 +1,12 @@
 from __future__ import unicode_literals
 
-from django import apps
 from django.utils.translation import ugettext_lazy as _
 
 from common import MayanAppConfig
 from common.classes import Package
 
 
-class MIMETypesApp(apps.AppConfig):
+class MIMETypesApp(MayanAppConfig):
     name = 'mimetype'
     verbose_name = _('MIME types')
 
diff --git a/mayan/apps/ocr/api_views.py b/mayan/apps/ocr/api_views.py
index f06cb01dcd..ded56e8ed8 100644
--- a/mayan/apps/ocr/api_views.py
+++ b/mayan/apps/ocr/api_views.py
@@ -1,17 +1,9 @@
 from __future__ import absolute_import, unicode_literals
 
-from django.core.exceptions import PermissionDenied
-from django.shortcuts import get_object_or_404
-
 from rest_framework import generics, status
 from rest_framework.response import Response
-from rest_framework.settings import api_settings
-from rest_framework.views import APIView
 
-from acls.models import AccessControlList
 from documents.models import Document, DocumentPage, DocumentVersion
-from permissions import Permission
-from rest_api.filters import MayanObjectPermissionsFilter
 from rest_api.permissions import MayanPermission
 
 from .models import DocumentPageContent
diff --git a/mayan/apps/ocr/parsers.py b/mayan/apps/ocr/parsers.py
index deab577b7d..bc21031037 100644
--- a/mayan/apps/ocr/parsers.py
+++ b/mayan/apps/ocr/parsers.py
@@ -75,7 +75,9 @@ class Parser(object):
             raise NoMIMETypeMatch
 
     def process_document_version(self, document_version):
-        logger.info('Starting parsing for document version: %s', document_version)
+        logger.info(
+            'Starting parsing for document version: %s', document_version
+        )
         logger.debug('document version: %d', document_version.pk)
 
         for document_page in document_version.pages.all():
@@ -124,7 +126,9 @@ class PopplerParser(Parser):
     def __init__(self):
         self.pdftotext_path = setting_pdftotext_path.value
         if not os.path.exists(self.pdftotext_path):
-            error_message = _('Cannot find pdftotext executable at: %s') % self.pdftotext_path
+            error_message = _(
+                'Cannot find pdftotext executable at: %s'
+            ) % self.pdftotext_path
             logger.error(error_message)
             raise ParserError(error_message)
 
@@ -178,9 +182,13 @@ class PDFMinerParser(Parser):
 
         with BytesIO() as string_buffer:
             rsrcmgr = PDFResourceManager()
-            device = TextConverter(rsrcmgr, outfp=string_buffer, laparams=LAParams())
+            device = TextConverter(
+                rsrcmgr, outfp=string_buffer, laparams=LAParams()
+            )
             interpreter = PDFPageInterpreter(rsrcmgr, device)
-            page = PDFPage.get_pages(file_object, maxpages=1, pagenos=(page_number - 1,))
+            page = PDFPage.get_pages(
+                file_object, maxpages=1, pagenos=(page_number - 1,)
+            )
             interpreter.process_page(page.next())
             device.close()
 
@@ -189,5 +197,6 @@ class PDFMinerParser(Parser):
             return string_buffer.getvalue()
 
 Parser.register(
-    mimetypes=('application/pdf',), parser_classes=(PopplerParser, PDFMinerParser)
+    mimetypes=('application/pdf',),
+    parser_classes=(PopplerParser, PDFMinerParser)
 )
diff --git a/mayan/apps/ocr/urls.py b/mayan/apps/ocr/urls.py
index 492aa2d049..554e3fced8 100644
--- a/mayan/apps/ocr/urls.py
+++ b/mayan/apps/ocr/urls.py
@@ -58,13 +58,12 @@ api_urls = patterns(
         name='document-ocr-submit-view'
     ),
     url(
-        r'^document_version/(?P<pk>\d+)/submit/$', APIDocumentVersionOCRView.as_view(),
+        r'^document_version/(?P<pk>\d+)/submit/$',
+        APIDocumentVersionOCRView.as_view(),
         name='document-version-ocr-submit-view'
     ),
     url(
         r'^page/(?P<pk>\d+)/content/$', APIDocumentPageContentView.as_view(),
         name='document-page-content-view'
     ),
-
 )
-
diff --git a/mayan/apps/tags/api_views.py b/mayan/apps/tags/api_views.py
index 7ce9aa5352..a4d2de5cb1 100644
--- a/mayan/apps/tags/api_views.py
+++ b/mayan/apps/tags/api_views.py
@@ -160,7 +160,9 @@ class APIDocumentTagListView(generics.ListCreateAPIView):
         Attach a tag to a document.
         """
 
-        return super(APIDocumentTagListView, self).post(request, *args, **kwargs)
+        return super(
+            APIDocumentTagListView, self
+        ).post(request, *args, **kwargs)
 
 
 class APIDocumentTagView(generics.RetrieveDestroyAPIView):
@@ -176,7 +178,9 @@ class APIDocumentTagView(generics.RetrieveDestroyAPIView):
         Remove a tag from the selected document.
         """
 
-        return super(APIDocumentTagView, self).delete(request, *args, **kwargs)
+        return super(
+            APIDocumentTagView, self
+        ).delete(request, *args, **kwargs)
 
     def get(self, *args, **kwargs):
         """
diff --git a/mayan/apps/tags/apps.py b/mayan/apps/tags/apps.py
index 362f3c3616..7a95c81e33 100644
--- a/mayan/apps/tags/apps.py
+++ b/mayan/apps/tags/apps.py
@@ -37,7 +37,10 @@ class TagsApp(MayanAppConfig):
 
         APIEndPoint(app=self, version_string='1')
 
-        Document.add_to_class('attached_tags', lambda document: DocumentTag.objects.filter(documents=document))
+        Document.add_to_class(
+            'attached_tags',
+            lambda document: DocumentTag.objects.filter(documents=document)
+        )
 
         ModelPermission.register(
             model=Document, permissions=(
diff --git a/mayan/apps/tags/migrations/0006_documenttag.py b/mayan/apps/tags/migrations/0006_documenttag.py
index c282d53177..bd1094dff5 100644
--- a/mayan/apps/tags/migrations/0006_documenttag.py
+++ b/mayan/apps/tags/migrations/0006_documenttag.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import models, migrations
+from django.db import migrations
 
 
 class Migration(migrations.Migration):
diff --git a/mayan/apps/tags/serializers.py b/mayan/apps/tags/serializers.py
index 439a500225..674c97a383 100644
--- a/mayan/apps/tags/serializers.py
+++ b/mayan/apps/tags/serializers.py
@@ -15,14 +15,18 @@ from .permissions import permission_tag_attach
 
 
 class TagSerializer(serializers.HyperlinkedModelSerializer):
-    documents = serializers.HyperlinkedIdentityField(view_name='rest_api:tag-document-list')
+    documents = serializers.HyperlinkedIdentityField(
+        view_name='rest_api:tag-document-list'
+    )
     documents_count = serializers.SerializerMethodField()
 
     class Meta:
         extra_kwargs = {
             'url': {'view_name': 'rest_api:tag-detail'},
         }
-        fields = ('color', 'documents', 'documents_count', 'id', 'label', 'url')
+        fields = (
+            'color', 'documents', 'documents_count', 'id', 'label', 'url'
+        )
         model = Tag
 
     def get_documents_count(self, instance):
@@ -30,14 +34,18 @@ class TagSerializer(serializers.HyperlinkedModelSerializer):
 
 
 class NewDocumentTagSerializer(serializers.Serializer):
-    tag = serializers.IntegerField(help_text=_('Primary key of the tag to be added.'))
+    tag = serializers.IntegerField(
+        help_text=_('Primary key of the tag to be added.')
+    )
 
     def create(self, validated_data):
         try:
             tag = Tag.objects.get(pk=validated_data['tag'])
 
             try:
-                Permission.check_permissions(self.context['request'].user, (permission_tag_attach,))
+                Permission.check_permissions(
+                    self.context['request'].user, (permission_tag_attach,)
+                )
             except PermissionDenied:
                 AccessControlList.objects.check_access(
                     permission_tag_attach, self.context['request'], tag
diff --git a/setup.py b/setup.py
index c17f683137..c17c2b6185 100644
--- a/setup.py
+++ b/setup.py
@@ -49,7 +49,9 @@ def find_packages(directory):
             if '__init__.py' in filenames:
                 packages.append('.'.join(fullsplit(dirpath)))
             elif filenames:
-                data_files.append([dirpath, [os.path.join(dirpath, f) for f in filenames]])
+                data_files.append(
+                    [dirpath, [os.path.join(dirpath, f) for f in filenames]]
+                )
 
     return packages