Linting and removing some non used imports

apps/rp/models.py

 from django.db import models
 from django.utils.translation import ugettext_lazy as _
 from django.core import files
-from django.core.files.base import ContentFile
 
 from taggit.managers import TaggableManager
 from newspaper import Article as ArticleParser
@@ -10,9 +9,7 @@ from django_fsm import FSMField, transition, RETURN_VALUE
 
 from io import BytesIO
 from datetime import datetime
-from tempfile import NamedTemporaryFile
 
-from project.settings import env
 from rp.utils import cleanup_url
 
 
@@ -158,14 +155,15 @@ class Article(VoteMixin):
         else:
             return self.status
 
-    @transition(field=status, source='NEW', target='NEW', permission="rp.can_vote")
+    @transition(field=status, source='NEW', target='NEW',
+                permission="rp.can_vote")
     @transition(field=status, source='DRAFT', target='DRAFT',
                 permission="rp.can_vote")
     def downvote(self, by=None):
         """
-        Downvote the article score for the given user and remove previous votes.
-        Draft articles can be downvoted but will not be moved back in the
-        _NEW_ queue.
+        Downvote the article score for the given user and remove previous
+        votes. Draft articles can be downvoted but will not be moved back in
+        the _NEW_ queue.
         """
         super(Article, self).downvote(by)