Antoine Pitrou <pit...@free.fr> added the comment:

Looking at the patch again, I think this isn't enough.
setdefault() will still call the lookup routine twice which, in the general 
case (i.e. lookdict() not lookdict_unicode()), can call arbitrary Python code 
through e.g. __eq__ methods.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13521>
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