Code cleanups

PEP8 cleanups. Add keyword arguments.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/document_comments/migrations/0001_initial.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
 from django.db import models, migrations

mayan/apps/document_comments/migrations/0002_auto_20150729_2144.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
 from django.db import models, migrations

mayan/apps/document_comments/migrations/0003_auto_20150729_2144.py

@@ -1,11 +1,10 @@
-# -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
 from django.db import migrations
 from django.conf import settings
 
 
-def migrate_old_comments(apps, schema_editor):
+def operation_migrate_old_comments(apps, schema_editor):
     # https://code.djangoproject.com/ticket/24282
     # If someone has a better solution until Django 1.8, would appreciate
     # a pull-request :)
@@ -17,13 +16,19 @@ def migrate_old_comments(apps, schema_editor):
         pass
     else:
 
-        Comment = apps.get_model('document_comments', 'Comment')
-        Document = apps.get_model('documents', 'Document')
+        Comment = apps.get_model(
+            app_label='document_comments', model_name='Comment'
+        )
+        Document = apps.get_model(
+            app_label='documents', model_name='Document'
+        )
         User = apps.get_model(*settings.AUTH_USER_MODEL.split('.'))
 
         for old_comment in OldComment.objects.using(schema_editor.connection.alias).all():
             comment = Comment(
-                document=Document.objects.using(schema_editor.connection.alias).get(pk=old_comment.object_pk),
+                document=Document.objects.using(
+                    schema_editor.connection.alias
+                ).get(pk=old_comment.object_pk),
                 user=User(old_comment.user.pk),
                 comment=old_comment.comment,
                 submit_date=old_comment.submit_date,
@@ -42,5 +47,5 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
-        migrations.RunPython(migrate_old_comments),
+        migrations.RunPython(code=operation_migrate_old_comments),
     ]

mayan/apps/document_comments/migrations/0004_auto_20150920_0202.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
 from django.db import models, migrations