diff --git a/taiga/auth/api.py b/taiga/auth/api.py
index 2663b3e0..48c1041d 100644
--- a/taiga/auth/api.py
+++ b/taiga/auth/api.py
@@ -27,8 +27,6 @@ from taiga.base.decorators import list_route
 from taiga.base import exceptions as exc
 from taiga.base import response
 
-from taiga.users.services import get_and_validate_user
-
 from .serializers import PublicRegisterSerializer
 from .serializers import PrivateRegisterForExistingUserSerializer
 from .serializers import PrivateRegisterForNewUserSerializer
diff --git a/taiga/auth/backends.py b/taiga/auth/backends.py
index b514f1e7..7f156c08 100644
--- a/taiga/auth/backends.py
+++ b/taiga/auth/backends.py
@@ -32,7 +32,6 @@ selfcontained tokens. This trust tokes from external
 fraudulent modifications.
 """
 
-import base64
 import re
 
 from django.conf import settings
@@ -40,6 +39,7 @@ from rest_framework.authentication import BaseAuthentication
 
 from .tokens import get_user_for_token
 
+
 class Session(BaseAuthentication):
     """
     Session based authentication like the standard
@@ -82,8 +82,8 @@ class Token(BaseAuthentication):
         token = token_rx_match.group(1)
         max_age_auth_token = getattr(settings, "MAX_AGE_AUTH_TOKEN", None)
         user = get_user_for_token(token, "authentication",
-            max_age=max_age_auth_token)
-            
+                                  max_age=max_age_auth_token)
+
         return (user, token)
 
     def authenticate_header(self, request):
diff --git a/taiga/auth/tokens.py b/taiga/auth/tokens.py
index 680e70fc..75d36e21 100644
--- a/taiga/auth/tokens.py
+++ b/taiga/auth/tokens.py
@@ -19,12 +19,13 @@ from taiga.base import exceptions as exc
 from django.apps import apps
 from django.core import signing
 
+
 def get_token_for_user(user, scope):
     """
     Generate a new signed token containing
     a specified user limited for a scope (identified as a string).
     """
-    data = {"user_%s_id"%(scope): user.id}
+    data = {"user_%s_id" % (scope): user.id}
     return signing.dumps(data)
 
 
@@ -47,7 +48,7 @@ def get_user_for_token(token, scope, max_age=None):
     model_cls = apps.get_model("users", "User")
 
     try:
-        user = model_cls.objects.get(pk=data["user_%s_id"%(scope)])
+        user = model_cls.objects.get(pk=data["user_%s_id" % (scope)])
     except (model_cls.DoesNotExist, KeyError):
         raise exc.NotAuthenticated("Invalid token")
     else:
diff --git a/taiga/base/api/generics.py b/taiga/base/api/generics.py
index 752ae201..a5b40c18 100644
--- a/taiga/base/api/generics.py
+++ b/taiga/base/api/generics.py
@@ -19,13 +19,11 @@
 
 import warnings
 
-from django.core.exceptions import ImproperlyConfigured, PermissionDenied
+from django.core.exceptions import ImproperlyConfigured
 from django.core.paginator import Paginator, InvalidPage
 from django.http import Http404
 from django.utils.translation import ugettext as _
 
-from rest_framework import exceptions
-from rest_framework.request import clone_request
 from rest_framework.settings import api_settings
 
 from . import views
@@ -166,8 +164,8 @@ class GenericAPIView(views.APIView):
             page = paginator.page(page_number)
         except InvalidPage as e:
             raise Http404(_('Invalid page (%(page_number)s): %(message)s') % {
-                                'page_number': page_number,
-                                'message': str(e)
+                'page_number': page_number,
+                'message': str(e)
             })
 
         if deprecated_style:
@@ -193,16 +191,16 @@ class GenericAPIView(views.APIView):
         """
         filter_backends = self.filter_backends or []
         if not filter_backends and hasattr(self, 'filter_backend'):
-            raise RuntimeException('The `filter_backend` attribute and `FILTER_BACKEND` setting '
-                                   'are due to be deprecated in favor of a `filter_backends` '
-                                   'attribute and `DEFAULT_FILTER_BACKENDS` setting, that take '
-                                   'a *list* of filter backend classes.')
+            raise RuntimeError('The `filter_backend` attribute and `FILTER_BACKEND` setting '
+                               'are due to be deprecated in favor of a `filter_backends` '
+                               'attribute and `DEFAULT_FILTER_BACKENDS` setting, that take '
+                               'a *list* of filter backend classes.')
         return filter_backends
 
-
-    ########################
-    ### The following methods provide default implementations
-    ### that you may want to override for more complex cases.
+    ###########################################################
+    # The following methods provide default implementations   #
+    # that you may want to override for more complex cases.   #
+    ###########################################################
 
     def get_paginate_by(self, queryset=None):
         """
@@ -214,8 +212,8 @@ class GenericAPIView(views.APIView):
         Otherwise defaults to using `self.paginate_by`.
         """
         if queryset is not None:
-            raise RuntimeException('The `queryset` parameter to `get_paginate_by()` '
-                                   'is due to be deprecated.')
+            raise RuntimeError('The `queryset` parameter to `get_paginate_by()` '
+                               'is due to be deprecated.')
         if self.paginate_by_param:
             try:
                 return strict_positive_int(
@@ -263,8 +261,7 @@ class GenericAPIView(views.APIView):
         if self.model is not None:
             return self.model._default_manager.all()
 
-        raise ImproperlyConfigured("'%s' must define 'queryset' or 'model'"
-                                    % self.__class__.__name__)
+        raise ImproperlyConfigured("'%s' must define 'queryset' or 'model'" % self.__class__.__name__)
 
     def get_object(self, queryset=None):
         """
@@ -280,7 +277,7 @@ class GenericAPIView(views.APIView):
         else:
             # NOTE: explicit exception for avoid and fix
             # usage of deprecated way of get_object
-            raise RuntimeException("DEPRECATED")
+            raise RuntimeError("DEPRECATED")
 
         # Perform the lookup filtering.
         # Note that `pk` and `slug` are deprecated styles of lookup filtering.
@@ -292,11 +289,11 @@ class GenericAPIView(views.APIView):
         if lookup is not None:
             filter_kwargs = {self.lookup_field: lookup}
         elif pk is not None and self.lookup_field == 'pk':
-            raise RuntimeException('The `pk_url_kwarg` attribute is due to be deprecated. '
-                                   'Use the `lookup_field` attribute instead')
+            raise RuntimeError('The `pk_url_kwarg` attribute is due to be deprecated. '
+                               'Use the `lookup_field` attribute instead')
         elif slug is not None and self.lookup_field == 'pk':
-            raise RuntimeException('The `slug_url_kwarg` attribute is due to be deprecated. '
-                                   'Use the `lookup_field` attribute instead')
+            raise RuntimeError('The `slug_url_kwarg` attribute is due to be deprecated. '
+                               'Use the `lookup_field` attribute instead')
         else:
             raise ImproperlyConfigured(
                 'Expected view %s to be called with a URL keyword argument '
@@ -314,12 +311,13 @@ class GenericAPIView(views.APIView):
         except Http404:
             return None
 
-    ########################
-    ### The following are placeholder methods,
-    ### and are intended to be overridden.
-    ###
-    ### The are not called by GenericAPIView directly,
-    ### but are used by the mixin methods.
+    ###################################################
+    # The following are placeholder methods,          #
+    # and are intended to be overridden.              #
+    #                                                 #
+    # The are not called by GenericAPIView directly,  #
+    # but are used by the mixin methods.              #
+    ###################################################
 
     def pre_conditions_on_save(self, obj):
         """
@@ -363,11 +361,11 @@ class GenericAPIView(views.APIView):
         pass
 
 
-##########################################################
-### Concrete view classes that provide method handlers ###
-### by composing the mixin classes with the base view. ###
-### NOTE: not used by taiga.                           ###
-##########################################################
+######################################################
+# Concrete view classes that provide method handlers #
+# by composing the mixin classes with the base view. #
+# NOTE: not used by taiga.                           #
+######################################################
 
 class CreateAPIView(mixins.CreateModelMixin,
                     GenericAPIView):
diff --git a/taiga/base/api/permissions.py b/taiga/base/api/permissions.py
index 95f8028d..ff1f8bef 100644
--- a/taiga/base/api/permissions.py
+++ b/taiga/base/api/permissions.py
@@ -219,8 +219,10 @@ class IsObjectOwner(PermissionComponent):
 class AllowAnyPermission(ResourcePermission):
     enought_perms = AllowAny()
 
+
 class IsAuthenticatedPermission(ResourcePermission):
     enought_perms = IsAuthenticated()
 
+
 class TaigaResourcePermission(ResourcePermission):
     enought_perms = IsSuperUser()
diff --git a/taiga/base/api/views.py b/taiga/base/api/views.py
index 638245a0..26cc5970 100644
--- a/taiga/base/api/views.py
+++ b/taiga/base/api/views.py
@@ -56,6 +56,7 @@ def get_view_name(view_cls, suffix=None):
 
     return name
 
+
 def get_view_description(view_cls, html=False):
     """
     Given a view class, return a textual description to represent the view.
@@ -141,7 +142,6 @@ class APIView(View):
             headers['Vary'] = 'Accept'
         return headers
 
-
     def http_method_not_allowed(self, request, *args, **kwargs):
         """
         If `request.method` does not correspond to a handler method,
@@ -445,7 +445,7 @@ class APIView(View):
 
 
 def api_server_error(request, *args, **kwargs):
-    if settings.DEBUG == False and request.META['CONTENT_TYPE'] == "application/json":
+    if settings.DEBUG is False and request.META['CONTENT_TYPE'] == "application/json":
         return HttpResponse(json.dumps({"error": "Server application error"}),
                             status=status.HTTP_500_INTERNAL_SERVER_ERROR)
     return server_error(request, *args, **kwargs)
diff --git a/taiga/base/api/viewsets.py b/taiga/base/api/viewsets.py
index edb8cfff..b2fbdd50 100644
--- a/taiga/base/api/viewsets.py
+++ b/taiga/base/api/viewsets.py
@@ -124,6 +124,7 @@ class GenericViewSet(ViewSetMixin, generics.GenericAPIView):
     """
     pass
 
+
 class ReadOnlyListViewSet(pagination.HeadersPaginationMixin,
                           pagination.ConditionalPaginationMixin,
                           GenericViewSet):
@@ -132,6 +133,7 @@ class ReadOnlyListViewSet(pagination.HeadersPaginationMixin,
     """
     pass
 
+
 class ReadOnlyModelViewSet(mixins.RetrieveModelMixin,
                            mixins.ListModelMixin,
                            GenericViewSet):
diff --git a/taiga/base/apps.py b/taiga/base/apps.py
index 1b6c9027..f2719c55 100644
--- a/taiga/base/apps.py
+++ b/taiga/base/apps.py
@@ -20,6 +20,7 @@ import sys
 from django.apps import AppConfig
 from . import monkey
 
+
 class BaseAppConfig(AppConfig):
     name = "taiga.base"
     verbose_name = "Base App Config"
@@ -28,4 +29,3 @@ class BaseAppConfig(AppConfig):
         print("Monkey patching...", file=sys.stderr)
         monkey.patch_restframework()
         monkey.patch_serializer()
-
diff --git a/taiga/base/connectors/exceptions.py b/taiga/base/connectors/exceptions.py
index ae2cf2bb..1619abba 100644
--- a/taiga/base/connectors/exceptions.py
+++ b/taiga/base/connectors/exceptions.py
@@ -18,6 +18,7 @@ from taiga.base.exceptions import BaseException
 
 from django.utils.translation import ugettext_lazy as _
 
+
 class ConnectorBaseException(BaseException):
     status_code = 400
     default_detail = _("Connection error.")
diff --git a/taiga/base/decorators.py b/taiga/base/decorators.py
index bf706df3..d11b97f9 100644
--- a/taiga/base/decorators.py
+++ b/taiga/base/decorators.py
@@ -17,7 +17,7 @@
 import warnings
 
 
-## Rest Framework 2.4 backport some decorators.
+# Rest Framework 2.4 backport some decorators.
 
 def detail_route(methods=['get'], **kwargs):
     """
@@ -51,12 +51,14 @@ def link(**kwargs):
     """
     msg = 'link is pending deprecation. Use detail_route instead.'
     warnings.warn(msg, PendingDeprecationWarning, stacklevel=2)
+
     def decorator(func):
         func.bind_to_methods = ['get']
         func.detail = True
         func.permission_classes = kwargs.get('permission_classes', [])
         func.kwargs = kwargs
         return func
+
     return decorator
 
 
@@ -66,10 +68,12 @@ def action(methods=['post'], **kwargs):
     """
     msg = 'action is pending deprecation. Use detail_route instead.'
     warnings.warn(msg, PendingDeprecationWarning, stacklevel=2)
+
     def decorator(func):
         func.bind_to_methods = methods
         func.detail = True
         func.permission_classes = kwargs.get('permission_classes', [])
         func.kwargs = kwargs
         return func
+
     return decorator
diff --git a/taiga/base/exceptions.py b/taiga/base/exceptions.py
index 3eb05f5f..2d3d5f33 100644
--- a/taiga/base/exceptions.py
+++ b/taiga/base/exceptions.py
@@ -23,7 +23,6 @@ from django.utils.translation import ugettext_lazy as _
 from django.http import Http404
 
 from taiga.base import response
-from taiga.base.utils.json import to_json
 
 
 class BaseException(exceptions.APIException):
diff --git a/taiga/base/filters.py b/taiga/base/filters.py
index fa6ff9b8..5b487496 100644
--- a/taiga/base/filters.py
+++ b/taiga/base/filters.py
@@ -102,7 +102,8 @@ class PermissionBasedFilterBackend(FilterBackend):
                 project_id = int(request.QUERY_PARAMS["project"])
             except:
                 logger.error("Filtering project diferent value than an integer: {}".format(
-                                                           request.QUERY_PARAMS["project"]))
+                    request.QUERY_PARAMS["project"]
+                ))
                 raise exc.BadRequest("'project' must be an integer value.")
 
         qs = queryset
@@ -190,7 +191,8 @@ class CanViewProjectObjFilterBackend(FilterBackend):
                 project_id = int(request.QUERY_PARAMS["project"])
             except:
                 logger.error("Filtering project diferent value than an integer: {}".format(
-                                                           request.QUERY_PARAMS["project"]))
+                    request.QUERY_PARAMS["project"]
+                ))
                 raise exc.BadRequest("'project' must be an integer value.")
 
         qs = queryset
diff --git a/taiga/base/management/commands/test_emails.py b/taiga/base/management/commands/test_emails.py
index 6b7f8bf5..29752dd4 100644
--- a/taiga/base/management/commands/test_emails.py
+++ b/taiga/base/management/commands/test_emails.py
@@ -17,7 +17,7 @@
 import datetime
 
 from django.db.models.loading import get_model
-from django.core.management.base import BaseCommand, CommandError
+from django.core.management.base import BaseCommand
 from django.utils import timezone
 
 from djmail.template_mail import MagicMailBuilder, InlineCSSTemplateMail
@@ -139,10 +139,10 @@ class Command(BaseCommand):
         ]
 
         context = {
-           "project": Project.objects.all().order_by("?").first(),
-           "changer": User.objects.all().order_by("?").first(),
-           "history_entries": HistoryEntry.objects.all().order_by("?")[0:5],
-           "user": User.objects.all().order_by("?").first(),
+            "project": Project.objects.all().order_by("?").first(),
+            "changer": User.objects.all().order_by("?").first(),
+            "history_entries": HistoryEntry.objects.all().order_by("?")[0:5],
+            "user": User.objects.all().order_by("?").first(),
         }
 
         for notification_email in notification_emails:
diff --git a/taiga/base/middleware/cors.py b/taiga/base/middleware/cors.py
index 03145e10..83031b73 100644
--- a/taiga/base/middleware/cors.py
+++ b/taiga/base/middleware/cors.py
@@ -14,8 +14,6 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-import json
-
 from django import http
 
 
@@ -33,7 +31,7 @@ COORS_EXPOSE_HEADERS = ["x-pagination-count", "x-paginated", "x-paginated-by",
 
 class CoorsMiddleware(object):
     def _populate_response(self, response):
-        response["Access-Control-Allow-Origin"]  = COORS_ALLOWED_ORIGINS
+        response["Access-Control-Allow-Origin"] = COORS_ALLOWED_ORIGINS
         response["Access-Control-Allow-Methods"] = ",".join(COORS_ALLOWED_METHODS)
         response["Access-Control-Allow-Headers"] = ",".join(COORS_ALLOWED_HEADERS)
         response["Access-Control-Expose-Headers"] = ",".join(COORS_EXPOSE_HEADERS)
diff --git a/taiga/base/monkey.py b/taiga/base/monkey.py
index 91d1be35..c956cab4 100644
--- a/taiga/base/monkey.py
+++ b/taiga/base/monkey.py
@@ -15,7 +15,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from __future__ import print_function
-import sys
+
 
 def patch_serializer():
     from rest_framework import serializers
diff --git a/taiga/base/neighbors.py b/taiga/base/neighbors.py
index d803b4ae..80ee6844 100644
--- a/taiga/base/neighbors.py
+++ b/taiga/base/neighbors.py
@@ -15,10 +15,8 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from functools import partial
 from collections import namedtuple
 
-from django.db.models import Q
 from django.db import connection
 
 Neighbor = namedtuple("Neighbor", "left right")
@@ -46,7 +44,7 @@ def get_neighbors(obj, results_set=None):
             (SELECT "id" as id, ROW_NUMBER() OVER()
                 FROM (%s) as ID_AND_ROW)
         AS SELECTED_ID_AND_ROW
-        """%(base_sql)
+        """ % (base_sql)
     query += " WHERE id=%s;"
     params = list(base_params) + [obj.id]
 
diff --git a/taiga/base/storage.py b/taiga/base/storage.py
index 1b99f53f..acf93306 100644
--- a/taiga/base/storage.py
+++ b/taiga/base/storage.py
@@ -19,6 +19,7 @@ from django.core.files import storage
 
 import django_sites as sites
 
+
 class FileSystemStorage(storage.FileSystemStorage):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
diff --git a/taiga/base/tags.py b/taiga/base/tags.py
index 9575f090..4b7c6409 100644
--- a/taiga/base/tags.py
+++ b/taiga/base/tags.py
@@ -15,9 +15,6 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-import re
-from functools import partial
-
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
 
diff --git a/taiga/base/utils/db.py b/taiga/base/utils/db.py
index 02f25d11..a9663751 100644
--- a/taiga/base/utils/db.py
+++ b/taiga/base/utils/db.py
@@ -31,6 +31,7 @@ def get_typename_for_model_class(model:object, for_concrete_model=True) -> str:
 
     return "{0}.{1}".format(model._meta.app_label, model._meta.model_name)
 
+
 def get_typename_for_model_instance(model_instance):
     """
     Get content type tuple from model instance.
diff --git a/taiga/base/utils/dicts.py b/taiga/base/utils/dicts.py
index 2d7e7077..512a044d 100644
--- a/taiga/base/utils/dicts.py
+++ b/taiga/base/utils/dicts.py
@@ -16,6 +16,7 @@
 
 import collections
 
+
 def dict_sum(*args):
     result = collections.Counter()
     for arg in args:
diff --git a/taiga/base/utils/functions.py b/taiga/base/utils/functions.py
index 5c8fae97..d20f824a 100644
--- a/taiga/base/utils/functions.py
+++ b/taiga/base/utils/functions.py
@@ -15,6 +15,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+
 def noop(*args, **kwargs):
     """The noop function."""
     return None
diff --git a/taiga/base/utils/json.py b/taiga/base/utils/json.py
index bb8dde78..9404febd 100644
--- a/taiga/base/utils/json.py
+++ b/taiga/base/utils/json.py
@@ -22,6 +22,7 @@ from django.utils.encoding import force_text
 def dumps(data, ensure_ascii=True, encoder_class=encoders.JSONEncoder):
     return json.dumps(data, cls=encoder_class, indent=None, ensure_ascii=ensure_ascii)
 
+
 def loads(data):
     if isinstance(data, bytes):
         data = force_text(data)
diff --git a/taiga/base/utils/sequence.py b/taiga/base/utils/sequence.py
index bdec27b6..18af3e2f 100644
--- a/taiga/base/utils/sequence.py
+++ b/taiga/base/utils/sequence.py
@@ -20,6 +20,7 @@ def first(iterable):
         return None
     return iterable[0]
 
+
 def next(data:list):
     return data[1:]
 
diff --git a/taiga/base/utils/signals.py b/taiga/base/utils/signals.py
index 9a457fe0..64cc580a 100644
--- a/taiga/base/utils/signals.py
+++ b/taiga/base/utils/signals.py
@@ -36,4 +36,3 @@ def without_signals(*disablers):
         for disabler in disablers:
             signal, *ids = disabler
             signal.receivers = signal.backup_receivers
-
diff --git a/taiga/base/utils/slug.py b/taiga/base/utils/slug.py
index d017664a..03b95767 100644
--- a/taiga/base/utils/slug.py
+++ b/taiga/base/utils/slug.py
@@ -14,7 +14,6 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from django.utils import baseconv
 from django.template.defaultfilters import slugify as django_slugify
 
 import time
diff --git a/taiga/events/middleware.py b/taiga/events/middleware.py
index c222d9f9..9dbfb103 100644
--- a/taiga/events/middleware.py
+++ b/taiga/events/middleware.py
@@ -30,9 +30,9 @@ def get_current_session_id() -> str:
 
     global _local
     if not hasattr(_local, "session_id"):
-        raise RuntimeException("No session identifier is found, "
-                               "ara you sure that session id middleware "
-                               "is active?")
+        raise RuntimeError("No session identifier is found, "
+                           "are you sure that session id middleware "
+                           "is active?")
     return _local.session_id
 
 
diff --git a/taiga/export_import/api.py b/taiga/export_import/api.py
index edf8911d..f05993df 100644
--- a/taiga/export_import/api.py
+++ b/taiga/export_import/api.py
@@ -26,8 +26,6 @@ from django.conf import settings
 from django.core.files.storage import default_storage
 from django.core.files.base import ContentFile
 
-from rest_framework.decorators import throttle_classes
-
 from taiga.base.decorators import detail_route, list_route
 from taiga.base import exceptions as exc
 from taiga.base import response
@@ -70,7 +68,7 @@ class ProjectExporterViewSet(mixins.ImportThrottlingPolicyMixin, GenericViewSet)
 
         path = "exports/{}/{}-{}.json".format(project.pk, project.slug, uuid.uuid4().hex)
         content = ContentFile(ExportRenderer().render(service.project_to_dict(project),
-            renderer_context={"indent": 4}).decode('utf-8'))
+                                                      renderer_context={"indent": 4}).decode('utf-8'))
 
         default_storage.save(path, content)
         response_data = {
@@ -187,7 +185,6 @@ class ProjectImporterViewSet(mixins.ImportThrottlingPolicyMixin, CreateModelMixi
         response_data = ProjectSerializer(project).data
         return response.Created(response_data)
 
-
     @detail_route(methods=['post'])
     @method_decorator(atomic)
     def issue(self, request, *args, **kwargs):
@@ -195,7 +192,7 @@ class ProjectImporterViewSet(mixins.ImportThrottlingPolicyMixin, CreateModelMixi
         self.check_permissions(request, 'import_item', project)
 
         signals.pre_save.disconnect(sender=Issue,
-            dispatch_uid="set_finished_date_when_edit_issue")
+                                    dispatch_uid="set_finished_date_when_edit_issue")
 
         issue = service.store_issue(project, request.DATA.copy())
 
diff --git a/taiga/export_import/dump_service.py b/taiga/export_import/dump_service.py
index b300ab84..09a9f0d9 100644
--- a/taiga/export_import/dump_service.py
+++ b/taiga/export_import/dump_service.py
@@ -14,8 +14,6 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from django.db.models import signals
-
 from taiga.projects.models import Membership
 
 from . import serializers
diff --git a/taiga/export_import/management/commands/load_dump.py b/taiga/export_import/management/commands/load_dump.py
index 3840e349..4566cf88 100644
--- a/taiga/export_import/management/commands/load_dump.py
+++ b/taiga/export_import/management/commands/load_dump.py
@@ -14,19 +14,19 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from django.core.management.base import BaseCommand, CommandError
+from django.core.management.base import BaseCommand
 from django.db import transaction
 from django.db.models import signals
 from optparse import make_option
 
 import json
-import pprint
 
 from taiga.projects.models import Project
 from taiga.export_import.renderers import ExportRenderer
 from taiga.export_import.dump_service import dict_to_project, TaigaImportError
 from taiga.export_import.service import get_errors
 
+
 class Command(BaseCommand):
     args = '<dump_file> <owner-email>'
     help = 'Export a project to json'
@@ -34,10 +34,10 @@ class Command(BaseCommand):
     renderer = ExportRenderer()
     option_list = BaseCommand.option_list + (
         make_option('--overwrite',
-            action='store_true',
-            dest='overwrite',
-            default=False,
-            help='Delete project if exists'),
+                    action='store_true',
+                    dest='overwrite',
+                    default=False,
+                    help='Delete project if exists'),
         )
 
     def handle(self, *args, **options):
diff --git a/taiga/export_import/renderers.py b/taiga/export_import/renderers.py
index 3d906f7a..8f540d07 100644
--- a/taiga/export_import/renderers.py
+++ b/taiga/export_import/renderers.py
@@ -16,5 +16,6 @@
 
 from rest_framework.renderers import UnicodeJSONRenderer
 
+
 class ExportRenderer(UnicodeJSONRenderer):
     pass
diff --git a/taiga/export_import/tasks.py b/taiga/export_import/tasks.py
index 3158f7ba..635eb63e 100644
--- a/taiga/export_import/tasks.py
+++ b/taiga/export_import/tasks.py
@@ -53,7 +53,6 @@ def dump_project(self, user, project):
         email.send()
         return
 
-
     deletion_date = timezone.now() + datetime.timedelta(seconds=settings.EXPORTS_TTL)
     ctx = {
         "url": url,
diff --git a/taiga/export_import/throttling.py b/taiga/export_import/throttling.py
index 77b1bb34..a59d7e33 100644
--- a/taiga/export_import/throttling.py
+++ b/taiga/export_import/throttling.py
@@ -20,5 +20,6 @@ from taiga.base import throttling
 class ImportModeRateThrottle(throttling.UserRateThrottle):
     scope = "import-mode"
 
+
 class ImportDumpModeRateThrottle(throttling.UserRateThrottle):
     scope = "import-dump-mode"
diff --git a/taiga/hooks/bitbucket/api.py b/taiga/hooks/bitbucket/api.py
index a73e9958..562b5763 100644
--- a/taiga/hooks/bitbucket/api.py
+++ b/taiga/hooks/bitbucket/api.py
@@ -61,7 +61,7 @@ class BitBucketViewSet(BaseWebhookApiViewSet):
         valid_origin_ips = bitbucket_config.get("valid_origin_ips",
                                                 settings.BITBUCKET_VALID_ORIGIN_IPS)
         origin_ip = get_real_ip(request)
-        if valid_origin_ips and (not origin_ip or not origin_ip in valid_origin_ips):
+        if valid_origin_ips and (not origin_ip or origin_ip not in valid_origin_ips):
             return False
 
         return project_secret == secret_key
diff --git a/taiga/hooks/bitbucket/event_hooks.py b/taiga/hooks/bitbucket/event_hooks.py
index a149923d..d82d3d4e 100644
--- a/taiga/hooks/bitbucket/event_hooks.py
+++ b/taiga/hooks/bitbucket/event_hooks.py
@@ -15,12 +15,11 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import re
-import os
 
 from django.utils.translation import ugettext_lazy as _
 
 from taiga.base import exceptions as exc
-from taiga.projects.models import Project, IssueStatus, TaskStatus, UserStoryStatus
+from taiga.projects.models import IssueStatus, TaskStatus, UserStoryStatus
 from taiga.projects.issues.models import Issue
 from taiga.projects.tasks.models import Task
 from taiga.projects.userstories.models import UserStory
@@ -33,6 +32,7 @@ from .services import get_bitbucket_user
 
 import json
 
+
 class PushEventHook(BaseEventHook):
     def process_event(self):
         if self.payload is None:
diff --git a/taiga/hooks/bitbucket/migrations/0001_initial.py b/taiga/hooks/bitbucket/migrations/0001_initial.py
index 372d93bb..9836b8d5 100644
--- a/taiga/hooks/bitbucket/migrations/0001_initial.py
+++ b/taiga/hooks/bitbucket/migrations/0001_initial.py
@@ -1,11 +1,12 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import models, migrations
+from django.db import migrations
 from django.core.files import File
 
 import uuid
 
+
 def create_github_system_user(apps, schema_editor):
     # We get the model from the versioned app registry;
     # if we directly import it, it'll be the wrong version
diff --git a/taiga/hooks/bitbucket/services.py b/taiga/hooks/bitbucket/services.py
index bcb74f56..625c91a8 100644
--- a/taiga/hooks/bitbucket/services.py
+++ b/taiga/hooks/bitbucket/services.py
@@ -35,7 +35,7 @@ def get_or_generate_config(project):
 
     url = reverse("bitbucket-hook-list")
     url = get_absolute_url(url)
-    url = "%s?project=%s&key=%s"%(url, project.id, g_config["secret"])
+    url = "%s?project=%s&key=%s" % (url, project.id, g_config["secret"])
     g_config["webhooks_url"] = url
     return g_config
 
diff --git a/taiga/hooks/github/api.py b/taiga/hooks/github/api.py
index 767aefd4..8251858f 100644
--- a/taiga/hooks/github/api.py
+++ b/taiga/hooks/github/api.py
@@ -46,7 +46,7 @@ class GitHubViewSet(BaseWebhookApiViewSet):
 
         secret = project.modules_config.config.get("github", {}).get("secret", "")
         secret = bytes(secret.encode("utf-8"))
-        mac = hmac.new(secret, msg=request.body,digestmod=hashlib.sha1)
+        mac = hmac.new(secret, msg=request.body, digestmod=hashlib.sha1)
         return hmac.compare_digest(mac.hexdigest(), signature)
 
     def _get_event_name(self, request):
diff --git a/taiga/hooks/github/event_hooks.py b/taiga/hooks/github/event_hooks.py
index d7231d72..8123bf00 100644
--- a/taiga/hooks/github/event_hooks.py
+++ b/taiga/hooks/github/event_hooks.py
@@ -16,7 +16,7 @@
 
 from django.utils.translation import ugettext_lazy as _
 
-from taiga.projects.models import Project, IssueStatus, TaskStatus, UserStoryStatus
+from taiga.projects.models import IssueStatus, TaskStatus, UserStoryStatus
 
 from taiga.projects.issues.models import Issue
 from taiga.projects.tasks.models import Task
diff --git a/taiga/hooks/github/migrations/0001_initial.py b/taiga/hooks/github/migrations/0001_initial.py
index 75e43abf..ba41a989 100644
--- a/taiga/hooks/github/migrations/0001_initial.py
+++ b/taiga/hooks/github/migrations/0001_initial.py
@@ -1,11 +1,12 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import models, migrations
+from django.db import migrations
 from django.core.files import File
 
 import uuid
 
+
 def create_github_system_user(apps, schema_editor):
     # We get the model from the versioned app registry;
     # if we directly import it, it'll be the wrong version
diff --git a/taiga/hooks/github/services.py b/taiga/hooks/github/services.py
index a02482af..e7924734 100644
--- a/taiga/hooks/github/services.py
+++ b/taiga/hooks/github/services.py
@@ -27,11 +27,11 @@ def get_or_generate_config(project):
     if config and "github" in config:
         g_config = project.modules_config.config["github"]
     else:
-        g_config = {"secret": uuid.uuid4().hex }
+        g_config = {"secret": uuid.uuid4().hex}
 
     url = reverse("github-hook-list")
     url = get_absolute_url(url)
-    url = "%s?project=%s"%(url, project.id)
+    url = "%s?project=%s" % (url, project.id)
     g_config["webhooks_url"] = url
     return g_config
 
diff --git a/taiga/hooks/gitlab/api.py b/taiga/hooks/gitlab/api.py
index 1f776b8e..01e455c5 100644
--- a/taiga/hooks/gitlab/api.py
+++ b/taiga/hooks/gitlab/api.py
@@ -14,7 +14,6 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from django.utils.translation import ugettext_lazy as _
 from django.conf import settings
 
 from ipware.ip import get_real_ip
diff --git a/taiga/hooks/gitlab/event_hooks.py b/taiga/hooks/gitlab/event_hooks.py
index 3a84a20d..426ab259 100644
--- a/taiga/hooks/gitlab/event_hooks.py
+++ b/taiga/hooks/gitlab/event_hooks.py
@@ -19,7 +19,7 @@ import os
 
 from django.utils.translation import ugettext_lazy as _
 
-from taiga.projects.models import Project, IssueStatus, TaskStatus, UserStoryStatus
+from taiga.projects.models import IssueStatus, TaskStatus, UserStoryStatus
 
 from taiga.projects.issues.models import Issue
 from taiga.projects.tasks.models import Task
diff --git a/taiga/hooks/gitlab/migrations/0001_initial.py b/taiga/hooks/gitlab/migrations/0001_initial.py
index 683d3956..8002d965 100644
--- a/taiga/hooks/gitlab/migrations/0001_initial.py
+++ b/taiga/hooks/gitlab/migrations/0001_initial.py
@@ -1,11 +1,12 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import models, migrations
+from django.db import migrations
 from django.core.files import File
 
 import uuid
 
+
 def create_github_system_user(apps, schema_editor):
     # We get the model from the versioned app registry;
     # if we directly import it, it'll be the wrong version
diff --git a/taiga/mdrender/extensions/wikilinks.py b/taiga/mdrender/extensions/wikilinks.py
index b2f58df2..1c16ae54 100644
--- a/taiga/mdrender/extensions/wikilinks.py
+++ b/taiga/mdrender/extensions/wikilinks.py
@@ -26,6 +26,7 @@ from taiga.base.utils.slug import slugify
 
 import re
 
+
 class WikiLinkExtension(Extension):
     def __init__(self, project, *args, **kwargs):
         self.project = project
@@ -66,6 +67,7 @@ class WikiLinksPattern(Pattern):
 
 SLUG_RE = re.compile(r"^[-a-zA-Z0-9_]+$")
 
+
 class RelativeLinksTreeprocessor(Treeprocessor):
     def __init__(self, md, project):
         self.project = project
diff --git a/taiga/mdrender/service.py b/taiga/mdrender/service.py
index 19715404..f4c12108 100644
--- a/taiga/mdrender/service.py
+++ b/taiga/mdrender/service.py
@@ -22,6 +22,7 @@ import bleach
 import html5lib
 from html5lib.serializer.htmlserializer import HTMLSerializer
 
+
 def _serialize(domtree):
     walker = html5lib.treewalkers.getTreeWalker('etree')
     stream = walker(domtree)
@@ -32,7 +33,7 @@ def _serialize(domtree):
     return serializer.render(stream)
 
 bleach._serialize = _serialize
-### END PATCH
+# END PATCH
 
 from django.core.cache import cache
 from django.utils.encoding import force_bytes
diff --git a/taiga/timeline/api.py b/taiga/timeline/api.py
index 4d907a69..4845b82a 100644
--- a/taiga/timeline/api.py
+++ b/taiga/timeline/api.py
@@ -23,7 +23,6 @@ from taiga.base.api import GenericViewSet
 from . import serializers
 from . import service
 from . import permissions
-from . import models
 
 
 class TimelineViewSet(GenericViewSet):
diff --git a/taiga/timeline/apps.py b/taiga/timeline/apps.py
index 3b0d7d90..c5d8e4a2 100644
--- a/taiga/timeline/apps.py
+++ b/taiga/timeline/apps.py
@@ -36,5 +36,3 @@ class TimelineAppConfig(AppConfig):
                                  sender=apps.get_model("projects", "Membership"))
         signals.post_delete.connect(handlers.delete_membership_push_to_timeline,
                                     sender=apps.get_model("projects", "Membership"))
-
-
diff --git a/taiga/timeline/permissions.py b/taiga/timeline/permissions.py
index 95110a61..f07ee929 100644
--- a/taiga/timeline/permissions.py
+++ b/taiga/timeline/permissions.py
@@ -15,7 +15,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from taiga.base.api.permissions import (TaigaResourcePermission, HasProjectPerm,
-                                        IsProjectOwner, AllowAny)
+                                        AllowAny)
 
 
 class UserTimelinePermission(TaigaResourcePermission):
diff --git a/taiga/userstorage/api.py b/taiga/userstorage/api.py
index 1ed184a9..31324c17 100644
--- a/taiga/userstorage/api.py
+++ b/taiga/userstorage/api.py
@@ -17,8 +17,6 @@
 from django.utils.translation import ugettext_lazy as _
 from django.db import IntegrityError
 
-from rest_framework.permissions import IsAuthenticated
-
 from taiga.base.api import ModelCrudViewSet
 from taiga.base import exceptions as exc
 
diff --git a/taiga/userstorage/filters.py b/taiga/userstorage/filters.py
index 265d7fb3..a46b1e61 100644
--- a/taiga/userstorage/filters.py
+++ b/taiga/userstorage/filters.py
@@ -16,6 +16,7 @@
 
 from taiga.base import filters
 
+
 class StorageEntriesFilterBackend(filters.FilterBackend):
     def filter_queryset(self, request, queryset, view):
         queryset = super().filter_queryset(request, queryset, view)
diff --git a/taiga/userstorage/models.py b/taiga/userstorage/models.py
index 15da5992..70dfb9ab 100644
--- a/taiga/userstorage/models.py
+++ b/taiga/userstorage/models.py
@@ -22,7 +22,7 @@ from django_pgjson.fields import JsonField
 
 class StorageEntry(models.Model):
     owner = models.ForeignKey(settings.AUTH_USER_MODEL, blank=False, null=False,
-                             related_name="storage_entries", verbose_name=_("owner"))
+                              related_name="storage_entries", verbose_name=_("owner"))
     created_date = models.DateTimeField(auto_now_add=True, null=False, blank=False,
                                         verbose_name=_("created date"))
     modified_date = models.DateTimeField(auto_now=True, null=False, blank=False,
diff --git a/taiga/webhooks/api.py b/taiga/webhooks/api.py
index 55f3fca4..cda88dd7 100644
--- a/taiga/webhooks/api.py
+++ b/taiga/webhooks/api.py
@@ -14,14 +14,11 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-import json
-
 from taiga.base import filters
 from taiga.base import response
 from taiga.base.api import ModelCrudViewSet
 from taiga.base.api import ModelListViewSet
 
-from taiga.base.api.utils import get_object_or_404
 from taiga.base.decorators import detail_route
 
 from . import models
diff --git a/taiga/webhooks/migrations/0004_auto_20150202_0834.py b/taiga/webhooks/migrations/0004_auto_20150202_0834.py
index 0517c952..434eefce 100644
--- a/taiga/webhooks/migrations/0004_auto_20150202_0834.py
+++ b/taiga/webhooks/migrations/0004_auto_20150202_0834.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/taiga/webhooks/models.py b/taiga/webhooks/models.py
index 6154b523..41f6fc84 100644
--- a/taiga/webhooks/models.py
+++ b/taiga/webhooks/models.py
@@ -24,7 +24,7 @@ class Webhook(models.Model):
     project = models.ForeignKey("projects.Project", null=False, blank=False,
                                 related_name="webhooks")
     name = models.CharField(max_length=250, null=False, blank=False,
-                        verbose_name=_("name"))
+                            verbose_name=_("name"))
     url = models.URLField(null=False, blank=False, verbose_name=_("URL"))
     key = models.TextField(null=False, blank=False, verbose_name=_("secret key"))
 
diff --git a/taiga/webhooks/serializers.py b/taiga/webhooks/serializers.py
index ec087484..613e832a 100644
--- a/taiga/webhooks/serializers.py
+++ b/taiga/webhooks/serializers.py
@@ -35,6 +35,7 @@ class HistoryDiffField(serializers.Field):
 
 class WebhookSerializer(serializers.ModelSerializer):
     logs_counter = serializers.SerializerMethodField("get_logs_counter")
+
     class Meta:
         model = Webhook
 
@@ -61,6 +62,7 @@ class UserSerializer(serializers.Serializer):
     def get_name(self, obj):
         return obj.full_name
 
+
 class PointSerializer(serializers.Serializer):
     id = serializers.SerializerMethodField("get_pk")
     name = serializers.SerializerMethodField("get_name")
diff --git a/taiga/webhooks/tasks.py b/taiga/webhooks/tasks.py
index 7a0f6dcd..2692d15c 100644
--- a/taiga/webhooks/tasks.py
+++ b/taiga/webhooks/tasks.py
@@ -86,7 +86,7 @@ def _send_request(webhook_id, url, key, data):
                                                 duration=0)
     session.close()
 
-    ids = [webhook_log.id for webhook_log in WebhookLog.objects.filter(webhook_id=webhook_id).order_by("-id")[10:]]
+    ids = [log.id for log in WebhookLog.objects.filter(webhook_id=webhook_id).order_by("-id")[10:]]
     WebhookLog.objects.filter(id__in=ids).delete()
     return webhook_log
 
@@ -135,4 +135,3 @@ def test_webhook(webhook_id, url, key):
     data['type'] = "test"
 
     return _send_request(webhook_id, url, key, data)
-