diff --git a/apps/api/activity/views.py b/apps/api/activity/views.py
index af2f0fe1..de6b8979 100644
--- a/apps/api/activity/views.py
+++ b/apps/api/activity/views.py
@@ -2,9 +2,11 @@
 # Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+from rest_framework import viewsets
+
 from activity.models import ActivityType, Activity, Guest
 from .serializers import ActivityTypeSerializer, ActivitySerializer, GuestSerializer
-from rest_framework import viewsets
+
 
 class ActivityTypeViewSet(viewsets.ModelViewSet):
     """
@@ -33,4 +35,4 @@ class GuestViewSet(viewsets.ModelViewSet):
     then render it on /api/activity/guest/
     """
     queryset = Guest.objects.all()
-    serializer_class = GuestSerializer
\ No newline at end of file
+    serializer_class = GuestSerializer
diff --git a/apps/api/members/views.py b/apps/api/members/views.py
index 9755151e..06b95dcc 100644
--- a/apps/api/members/views.py
+++ b/apps/api/members/views.py
@@ -2,9 +2,10 @@
 # Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+from rest_framework import viewsets
+
 from member.models import Profile, Club, Role, Membership
 from .serializers import ProfileSerializer, ClubSerializer, RoleSerializer, MembershipSerializer
-from rest_framework import viewsets
 
 
 class ProfileViewSet(viewsets.ModelViewSet):
diff --git a/apps/api/note/urls.py b/apps/api/note/urls.py
index 0c25785d..4ef14e28 100644
--- a/apps/api/note/urls.py
+++ b/apps/api/note/urls.py
@@ -2,8 +2,8 @@
 # Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-from .views import NoteViewSet, NotePolymorphicViewSet, NoteClubViewSet, NoteUserViewSet, NoteSpecialViewSet, AliasViewSet, \
-                            TransactionViewSet, TransactionTemplateViewSet, MembershipTransactionViewSet
+from .views import NotePolymorphicViewSet, AliasViewSet, \
+    TransactionViewSet, TransactionTemplateViewSet, MembershipTransactionViewSet
 
 
 def register_note_urls(router, path):
diff --git a/apps/api/note/views.py b/apps/api/note/views.py
index 63ab08e5..07bc9fd2 100644
--- a/apps/api/note/views.py
+++ b/apps/api/note/views.py
@@ -3,11 +3,13 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 from django.db.models import Q
+from rest_framework import viewsets
+
 from note.models.notes import Note, NoteClub, NoteSpecial, NoteUser, Alias
 from note.models.transactions import TransactionTemplate, Transaction, MembershipTransaction
-from .serializers import NoteSerializer, NotePolymorphicSerializer, NoteClubSerializer, NoteSpecialSerializer, NoteUserSerializer, AliasSerializer, \
-                        TransactionTemplateSerializer, TransactionSerializer, MembershipTransactionSerializer
-from rest_framework import viewsets
+from .serializers import NoteSerializer, NotePolymorphicSerializer, NoteClubSerializer, NoteSpecialSerializer, \
+    NoteUserSerializer, AliasSerializer, \
+    TransactionTemplateSerializer, TransactionSerializer, MembershipTransactionSerializer
 
 
 class NoteViewSet(viewsets.ModelViewSet):
diff --git a/apps/api/urls.py b/apps/api/urls.py
index 60758050..9c64abed 100644
--- a/apps/api/urls.py
+++ b/apps/api/urls.py
@@ -10,15 +10,18 @@ from .activity.urls import register_activity_urls
 from .members.urls import register_members_urls
 from .note.urls import register_note_urls
 
+
 class UserSerializer(serializers.ModelSerializer):
     """
     REST API Serializer for Users.
     The djangorestframework plugin will analyse the model `User` and parse all fields in the API.
     """
+
     class Meta:
         model = User
         exclude = ('password', 'groups', 'user_permissions',)
 
+
 class UserViewSet(viewsets.ModelViewSet):
     """
     REST API View set.
@@ -28,6 +31,7 @@ class UserViewSet(viewsets.ModelViewSet):
     queryset = User.objects.all()
     serializer_class = UserSerializer
 
+
 # Routers provide an easy way of automatically determining the URL conf.
 router = routers.DefaultRouter()
 router.register('user', UserViewSet)
@@ -46,4 +50,4 @@ register_note_urls(router, 'note')
 urlpatterns = [
     url('^', include(router.urls)),
     url('^api-auth/', include('rest_framework.urls', namespace='rest_framework'))
-]
\ No newline at end of file
+]
diff --git a/requirements.txt b/requirements.txt
index 3be0a4d2..d103764e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,4 +23,4 @@ requests==2.22.0
 requests-oauthlib==1.2.0
 six==1.12.0
 sqlparse==0.3.0
-urllib3==1.25.3
\ No newline at end of file
+urllib3==1.25.3