--- Lib/contextlib.py.orig	2010-10-08 12:50:17.246258779 +0200
+++ Lib/contextlib.py	2010-10-08 13:13:17.756555409 +0200
@@ -152,3 +152,16 @@
         return self.thing
     def __exit__(self, *exc_info):
         self.thing.close()
+
+class Null(object):
+    """Helper for null context manager."""
+    def __enter__(self):
+        return None
+    def __exit__(*ignored):
+        return False
+
+_null = Null()
+
+def null():
+    """No-op context manager, executes block without doing anything else."""
+    return _null