diff -r 672e3c4bbd0c -r 9864fe2067cd src/notes/api/views/core.py
--- a/src/notes/api/views/core.py	Mon Jul 17 14:13:32 2017 +0200
+++ b/src/notes/api/views/core.py	Tue Jul 18 17:08:27 2017 +0200
@@ -1,11 +1,15 @@
+"""
+Core viewsets
+"""
 import logging
 
 from notes.models import Note, Session
-from rest_framework import viewsets, serializers
+from rest_framework import viewsets
 
 from ..permissions import NotePermission, SessionPermission
-from ..serializers.core import (DetailNoteSerializer, UpdateNoteSerializer, DetailSessionSerializer, CreateNoteSerializer,
-                                ListNoteSerializer, ListSessionSerializer, CreateSessionSerializer)
+from ..serializers.core import (DetailNoteSerializer, UpdateNoteSerializer, DetailSessionSerializer,
+                                CreateNoteSerializer, ListNoteSerializer, ListSessionSerializer,
+                                CreateSessionSerializer)
 
 logger = logging.getLogger(__name__)