diff --git a/mayan/apps/common/apps.py b/mayan/apps/common/apps.py
index a1a3e47f6f..2358c22a25 100644
--- a/mayan/apps/common/apps.py
+++ b/mayan/apps/common/apps.py
@@ -29,7 +29,7 @@ from .links import (
 
 from .literals import DELETE_STALE_UPLOADS_INTERVAL
 from .menus import (
-    menu_about, menu_main, menu_secondary, menu_tools, menu_user
+    menu_about, menu_main, menu_secondary, menu_user
 )
 from .licenses import *  # NOQA
 from .queues import *  # NOQA - Force queues registration
diff --git a/mayan/apps/common/compressed_files.py b/mayan/apps/common/compressed_files.py
index 646d0b5724..4898a9f5ac 100644
--- a/mayan/apps/common/compressed_files.py
+++ b/mayan/apps/common/compressed_files.py
@@ -6,7 +6,7 @@ import zipfile
 try:
     import zlib  # NOQA
     COMPRESSION = zipfile.ZIP_DEFLATED
-except:
+except ImportError:
     COMPRESSION = zipfile.ZIP_STORED
 
 from django.core.files.uploadedfile import SimpleUploadedFile
diff --git a/mayan/apps/common/generics.py b/mayan/apps/common/generics.py
index ec946e6fc2..3aab7d628a 100644
--- a/mayan/apps/common/generics.py
+++ b/mayan/apps/common/generics.py
@@ -127,7 +127,7 @@ class AssignRemoveView(ExtraContextMixin, ViewPermissionCheckMixin, ObjectPermis
 
                     try:
                         action_function(selection_obj)
-                    except:
+                    except Exception:
                         if settings.DEBUG:
                             raise
                         else:
diff --git a/mayan/apps/common/javascript.py b/mayan/apps/common/javascript.py
index f25bc67a36..2c2d8d5d16 100644
--- a/mayan/apps/common/javascript.py
+++ b/mayan/apps/common/javascript.py
@@ -5,7 +5,6 @@ import hashlib
 import json
 import os
 import shutil
-import sys
 import tarfile
 
 from furl import furl
diff --git a/mayan/apps/common/templatetags/common_tags.py b/mayan/apps/common/templatetags/common_tags.py
index e85087647f..5192a9ad0a 100644
--- a/mayan/apps/common/templatetags/common_tags.py
+++ b/mayan/apps/common/templatetags/common_tags.py
@@ -4,7 +4,6 @@ from json import dumps
 
 import sh
 
-from django.conf import settings
 from django.template import Context, Library
 from django.template.loader import get_template
 from django.utils.encoding import force_text
diff --git a/mayan/apps/common/views.py b/mayan/apps/common/views.py
index 98626d7cca..14bec19514 100644
--- a/mayan/apps/common/views.py
+++ b/mayan/apps/common/views.py
@@ -5,13 +5,13 @@ from json import dumps
 from django.conf import settings
 from django.contrib import messages
 from django.contrib.contenttypes.models import ContentType
-from django.http import Http404, HttpResponseRedirect
+from django.http import HttpResponseRedirect
 from django.shortcuts import get_object_or_404, resolve_url
 from django.template import RequestContext
-from django.urls import reverse, reverse_lazy
+from django.urls import reverse_lazy
 from django.utils import timezone, translation
 from django.utils.http import urlencode
-from django.utils.translation import ugettext_lazy as _, ugettext
+from django.utils.translation import ugettext_lazy as _
 from django.views.generic import RedirectView, TemplateView
 
 from acls.models import AccessControlList
diff --git a/mayan/apps/document_signatures/literals.py b/mayan/apps/document_signatures/literals.py
index 44464a1cd5..f27ca1f9d8 100644
--- a/mayan/apps/document_signatures/literals.py
+++ b/mayan/apps/document_signatures/literals.py
@@ -1,4 +1,3 @@
 from __future__ import unicode_literals
 
 RETRY_DELAY = 10
-
diff --git a/mayan/apps/document_signatures/tasks.py b/mayan/apps/document_signatures/tasks.py
index 2e90d94b46..3d358d668d 100644
--- a/mayan/apps/document_signatures/tasks.py
+++ b/mayan/apps/document_signatures/tasks.py
@@ -6,8 +6,6 @@ from django.apps import apps
 
 from mayan.celery import app
 
-from .literals import RETRY_DELAY
-
 logger = logging.getLogger(__name__)
 
 
diff --git a/mayan/apps/documents/models.py b/mayan/apps/documents/models.py
index e10f21bd83..60a9f90e23 100644
--- a/mayan/apps/documents/models.py
+++ b/mayan/apps/documents/models.py
@@ -649,7 +649,7 @@ class DocumentVersion(models.Model):
                     self.mimetype, self.encoding = get_mimetype(
                         file_object=file_object
                     )
-            except:
+            except Exception:
                 self.mimetype = ''
                 self.encoding = ''
             finally:
diff --git a/mayan/apps/documents/tests/test_document_type_views.py b/mayan/apps/documents/tests/test_document_type_views.py
index 117077688e..049ce2d236 100644
--- a/mayan/apps/documents/tests/test_document_type_views.py
+++ b/mayan/apps/documents/tests/test_document_type_views.py
@@ -3,7 +3,7 @@ from __future__ import unicode_literals
 from ..literals import (
     DEFAULT_DELETE_PERIOD, DEFAULT_DELETE_TIME_UNIT
 )
-from ..models import Document, DocumentType
+from ..models import DocumentType
 from ..permissions import (
     permission_document_type_create, permission_document_type_delete,
     permission_document_type_edit, permission_document_type_view,
@@ -213,6 +213,6 @@ class DocumentTypeQuickLabelViewsTestCase(GenericDocumentViewTestCase):
             obj=self.document_type, permission=permission_document_type_view
         )
         response = self._request_quick_label_list_view()
-        self.assertContains(response, text=self.document_type_filename,
-            status_code=200
+        self.assertContains(
+            response, text=self.document_type_filename, status_code=200
         )
diff --git a/mayan/apps/documents/tests/test_models.py b/mayan/apps/documents/tests/test_models.py
index d2c6d644ee..25786aa361 100644
--- a/mayan/apps/documents/tests/test_models.py
+++ b/mayan/apps/documents/tests/test_models.py
@@ -1,10 +1,8 @@
 from __future__ import unicode_literals
 
 from datetime import timedelta
-import os
 import time
 
-from django.conf import settings
 from django.test import override_settings
 
 from common.tests import BaseTestCase
@@ -18,7 +16,7 @@ from .base import GenericDocumentTestCase
 from .literals import (
     TEST_DOCUMENT_TYPE_LABEL, TEST_DOCUMENT_PATH, TEST_MULTI_PAGE_TIFF_PATH,
     TEST_PDF_INDIRECT_ROTATE_PATH, TEST_OFFICE_DOCUMENT_PATH,
-    TEST_SMALL_DOCUMENT_FILENAME, TEST_SMALL_DOCUMENT_PATH
+    TEST_SMALL_DOCUMENT_PATH
 )
 
 
diff --git a/mayan/apps/mailer/forms.py b/mayan/apps/mailer/forms.py
index 3f46a7a394..550264e489 100644
--- a/mayan/apps/mailer/forms.py
+++ b/mayan/apps/mailer/forms.py
@@ -3,7 +3,6 @@ from __future__ import unicode_literals
 import json
 
 from django import forms
-from django.conf import settings
 from django.utils.translation import ugettext_lazy as _
 
 from acls.models import AccessControlList
diff --git a/mayan/apps/metadata/api.py b/mayan/apps/metadata/api.py
index 6a3c98bdc7..e64505c248 100644
--- a/mayan/apps/metadata/api.py
+++ b/mayan/apps/metadata/api.py
@@ -96,7 +96,7 @@ def metadata_repr_as_list(metadata_list):
         try:
             output.append('%s - %s' % (MetadataType.objects.get(
                 pk=metadata_dict['id']), metadata_dict.get('value', '')))
-        except:
+        except Exception:
             pass
 
     return output
diff --git a/mayan/apps/metadata/apps.py b/mayan/apps/metadata/apps.py
index c6d1d856a0..b169f165a5 100644
--- a/mayan/apps/metadata/apps.py
+++ b/mayan/apps/metadata/apps.py
@@ -17,7 +17,6 @@ from common.classes import ModelAttribute
 from common.widgets import two_state_template
 from documents.search import document_page_search, document_search
 from documents.signals import post_document_type_change
-from documents.permissions import permission_document_view
 from mayan.celery import app
 from navigation import SourceColumn
 
diff --git a/mayan/apps/permissions/tests/test_views.py b/mayan/apps/permissions/tests/test_views.py
index 998b2f0370..ddfad6236a 100644
--- a/mayan/apps/permissions/tests/test_views.py
+++ b/mayan/apps/permissions/tests/test_views.py
@@ -120,14 +120,12 @@ class PermissionsViewsTestCase(GenericViewTestCase):
     def test_role_permissions_view_with_permission_grant(self):
         self._create_role()
         self.grant_access(permission=permission_permission_grant, obj=self.role_2)
-        #self.grant_access(permission=permission_role_edit, obj=self.role_2)
         response = self._request_role_permissions_view()
         self.assertEqual(response.status_code, 200)
 
     def test_role_permissions_view_with_permission_revoke(self):
         self._create_role()
         self.grant_access(permission=permission_permission_revoke, obj=self.role_2)
-        #self.grant_access(permission=permission_role_edit, obj=self.role_2)
         response = self._request_role_permissions_view()
         self.assertEqual(response.status_code, 200)
 
diff --git a/mayan/apps/sources/tests/test_links.py b/mayan/apps/sources/tests/test_links.py
index e23dc96695..2b86b1c20a 100644
--- a/mayan/apps/sources/tests/test_links.py
+++ b/mayan/apps/sources/tests/test_links.py
@@ -1,9 +1,5 @@
 from __future__ import unicode_literals
 
-from django.contrib.contenttypes.models import ContentType
-from django.urls import reverse
-
-from acls.models import AccessControlList
 from documents.tests import GenericDocumentViewTestCase
 from documents.permissions import permission_document_create
 
diff --git a/mayan/apps/storage/backends/compressedstorage.py b/mayan/apps/storage/backends/compressedstorage.py
index 008c575bc4..ad0a69e971 100644
--- a/mayan/apps/storage/backends/compressedstorage.py
+++ b/mayan/apps/storage/backends/compressedstorage.py
@@ -6,7 +6,7 @@ import zipfile
 try:
     import zlib  # NOQA
     COMPRESSION = zipfile.ZIP_DEFLATED
-except:
+except ImportError:
     COMPRESSION = zipfile.ZIP_STORED
 
 try:
diff --git a/mayan/apps/tags/widgets.py b/mayan/apps/tags/widgets.py
index 9b1e55fe4e..449069576c 100644
--- a/mayan/apps/tags/widgets.py
+++ b/mayan/apps/tags/widgets.py
@@ -3,8 +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.encoding import force_text
-from django.utils.html import format_html
 from django.utils.safestring import mark_safe
 
 from .permissions import permission_tag_view
diff --git a/mayan/apps/user_management/tests/test_views.py b/mayan/apps/user_management/tests/test_views.py
index 5af70f354c..3191422e15 100644
--- a/mayan/apps/user_management/tests/test_views.py
+++ b/mayan/apps/user_management/tests/test_views.py
@@ -14,13 +14,11 @@ from metadata.tests.literals import (
 )
 
 from ..permissions import (
-    permission_user_create, permission_user_delete, permission_user_edit,
-    permission_user_view
+    permission_user_create, permission_user_delete, permission_user_edit
 )
 
 from .literals import (
-    TEST_USER_PASSWORD_EDITED, TEST_USER_USERNAME, TEST_USER_2_USERNAME,
-    TEST_USER_2_USERNAME_EDITED
+    TEST_USER_PASSWORD_EDITED, TEST_USER_USERNAME, TEST_USER_2_USERNAME
 )
 
 TEST_USER_TO_DELETE_USERNAME = 'user_to_delete'