Change UserDict to IterableUserDict

diff --git a/Lib/os.py b/Lib/os.py
index a89c471fc60fee30e4fc9000412ad19fa6ac5012..8a46b4145593185b3c30580a0232fa057a1cbad8 100644 (file)
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -395,7 +395,7 @@ else:
                     self[k] = v
 
     else:  # Where Env Var Names Can Be Mixed Case
-        class _Environ(UserDict.UserDict):
+        class _Environ(UserDict.IterableUserDict):
             def __init__(self, environ):
                 UserDict.UserDict.__init__(self)
                 self.data = environ