Code cleanup some small changes in the formatting.

src/maistar_ranking/models.py

@@ -4,7 +4,9 @@ import logging
 
 from django.core.urlresolvers import reverse
 from django.db import models
+from django.db.models.signals import post_delete, post_save
 from django.utils.translation import ugettext as _
+from django.dispatch import receiver
 
 from events.models import Event
 from . import settings, managers
@@ -197,9 +199,14 @@ class Ranking(models.Model):
         self.save()
 
 
-def update_maistar_ranking(sender, instance, **kwargs):
-    """A Django signal hook to trigger a recalculation of the rankings as soon
-    as a Mai-Star game has been added, deleted, or modified."""
+@receiver([post_delete, post_save], sender=Game)
+def update_maistar_ranking(sender, **kwargs):
+    """
+    A Django signal hook to trigger a recalculation of the rankings as soon
+    as a Mai-Star game has been added, deleted, or modified.
+    :param sender: The callback function which will be connected to this signal. See Receiver functions for more information.
+    :param kwargs: """
+    instance = kwargs['instance']
     for player in instance.player_list:
         ranking, created = Ranking.objects.get_or_create(
             user=player['user'],
@@ -213,7 +220,3 @@ def update_maistar_ranking(sender, instance, **kwargs):
                           player['user'].username, instance.season)
         ranking.recalculate()
     Ranking.objects.calculate_rankings(instance.season)
-
-
-models.signals.post_delete.connect(update_maistar_ranking, sender=Game)
-models.signals.post_save.connect(update_maistar_ranking, sender=Game)