Use map() in python3 style

boards/models/post.py

@@ -78,8 +78,7 b' class PostManager(models.Manager):'
                                                             post.id))
 
         thread.replies.add(post)
-        for tag in tags:
-            thread.add_tag(tag)
+        list(map(thread.add_tag, tags))
 
         if new_thread:
             Thread.objects.process_oldest_threads()