Alexander Belopolsky added the comment:

Let's get back on-topic.

I assume you are recommending to close this issue by rejecting the 
patch.  I disagree.  The patch can be fixed to properly override all 
methods and a unit test can be added to guarantee that all dict methods 
are overridden.

The patch has two distinct benefits: (1) UserDict is not loaded on 
startup; and (2) os.environ is faster.  IMHO, these two reasons make the 
patch worth pursuing.

BTW, one of the objections based on exec .. in os.environ behavior (see 
http://bugs.python.org/msg49131) has become invalid since then.

Specific issues should of course be addressed.

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<http://bugs.python.org/issue2144>
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