From 79ff1aedd57a154a7563fb1b71c3e7997c513408 Mon Sep 17 00:00:00 2001
From: Aymeric Augustin <aymeric.augustin@m4x.org>
Date: Sun, 9 Jun 2013 14:31:04 +0200
Subject: [PATCH] Replaced a dict emulating a set with a set.

---
 django/db/models/loading.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/django/db/models/loading.py b/django/db/models/loading.py
index 4372873e50..5ad2f12ba0 100644
--- a/django/db/models/loading.py
+++ b/django/db/models/loading.py
@@ -39,7 +39,7 @@ class AppCache(object):
 
         # -- Everything below here is only used when populating the cache --
         loaded=False,
-        handled={},
+        handled=set(),
         postponed=[],
         nesting_level=0,
         _get_models_cache={},
@@ -89,7 +89,7 @@ class AppCache(object):
         Loads the app with the provided fully qualified name, and returns the
         model module.
         """
-        self.handled[app_name] = None
+        self.handled.add(app_name)
         self.nesting_level += 1
         app_module = import_module(app_name)
         try: