diff --git a/src/account/views.py b/src/account/views.py
index d3fe6df1d9541417f4596b9bde4ecabd27fe2c12..456f83c27f5d2434794ce769355b3e3e5544b12e 100644
--- a/src/account/views.py
+++ b/src/account/views.py
@@ -5,8 +5,6 @@ from rest_framework.decorators import action
 from common.permissions import IsSafeOrPatch
 from rest_framework_api_key.permissions import HasAPIKey
 
-from django.db.models import Sum
-
 from . import models
 from . import serializers
 
diff --git a/src/document/serializers.py b/src/document/serializers.py
index 15909a4045cfd2274c4dac675e0d0900f81e13f0..616321803f490246ede36bb5a43285d54ecc6577 100644
--- a/src/document/serializers.py
+++ b/src/document/serializers.py
@@ -22,7 +22,7 @@ class DocumentSerializer(serializers.ModelSerializer):
             'uploaded_by_name',
             'solution',
         ]
-        
+
         read_only_fields = [
             'uploaded_by',
             'uploaded_at',
diff --git a/src/homework/views.py b/src/homework/views.py
index 916a3effb3b89d08b03ecb2d9e23df278c9d3c83..554533838cf23f7fedca98b9d6d8490688d9257e 100755
--- a/src/homework/views.py
+++ b/src/homework/views.py
@@ -17,7 +17,7 @@ class TasksViewSet(viewsets.ModelViewSet):
         kwargs = {
             'created_by': self.request.user.profile
         }
- 
+
         serializer.save(**kwargs)
 
 
@@ -40,10 +40,10 @@ class SolutionsViewSet(viewsets.ModelViewSet):
             if profile_id is not None:
                 queryset = queryset.filter(created_by=profile_id)
         return queryset
-    
+
     def perform_create(self, serializer):
         kwargs = {
             'created_by': self.request.user.profile
         }
- 
+
         serializer.save(**kwargs)
diff --git a/src/news/views.py b/src/news/views.py
index 87c9c7187c16c04d024f9fe3b621e033b32ea40a..28e9e71fd1f32a36460f4580ccb672e57b684d43 100644
--- a/src/news/views.py
+++ b/src/news/views.py
@@ -14,5 +14,5 @@ class NewsViewSet(viewsets.ModelViewSet):
             'author': self.request.user.profile,
             'updated_by': self.request.user.profile,
         }
- 
-        serializer.save(**kwargs)
\ No newline at end of file
+
+        serializer.save(**kwargs)
diff --git a/src/stats/views.py b/src/stats/views.py
index 6b022f2d23df404a1e81112006118023c26795f8..f1e5c802775b4728575577f9311e1e533a29488d 100644
--- a/src/stats/views.py
+++ b/src/stats/views.py
@@ -13,7 +13,7 @@ class StaffEventViewSet(viewsets.ModelViewSet):
         kwargs = {
             'created_by': self.request.user.profile
         }
- 
+
         serializer.save(**kwargs)
 
 
@@ -26,7 +26,7 @@ class StudentEventViewSet(viewsets.ModelViewSet):
         kwargs = {
             'created_by': self.request.user.profile
         }
- 
+
         serializer.save(**kwargs)
 
 
@@ -45,10 +45,10 @@ class NoteViewSet(viewsets.ModelViewSet):
         if event_id is not None:
             return queryset.filter(event=event_id)
         return queryset
-    
+
     def perform_create(self, serializer):
         kwargs = {
             'created_by': self.request.user.profile
         }
- 
+
         serializer.save(**kwargs)