R. David Murray added the comment:

Based on reading the patch.dict doct, I'm guessing that that dict call is 
making a copy in order to do a restore later.  Perhaps replacing the dict call 
with a copy call would be sufficient? (I haven't looked at the dict.patch code).

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nosy: +r.david.murray, rbcollins

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<http://bugs.python.org/issue24928>
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