From 7ac9d4020100b99b17eeddf65bafa8e87f9f293a Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Fri, 18 May 2007 00:24:43 +0000
Subject: Protect abs__file__() from changes to sys.modules while it's running.

---
 Lib/site.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Lib/site.py b/Lib/site.py
index ba8603c..47196e4 100644
--- a/Lib/site.py
+++ b/Lib/site.py
@@ -69,7 +69,7 @@ def makepath(*paths):
 
 def abs__file__():
     """Set all module' __file__ attribute to an absolute path"""
-    for m in sys.modules.values():
+    for m in set(sys.modules.values()):
         if hasattr(m, '__loader__'):
             continue   # don't mess with a PEP 302-supplied __file__
         try:
-- 
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