Raymond Hettinger added the comment:

I agree with Antoine that, "As the name suggests, __getstate__ should probably 
not mutate anything."

Unless a problematic non-mutating example can be found, I suggest this be 
closed.  For the most part, our rule has been that pure python code doesn't 
have to (and possibly cannot) defend itself against mid-stream mutation, while 
C code only has to defend itself to the point of avoiding a segfault.  

IMO, "RuntimeError: dictionary changed size during iteration" is an informative 
error message in this case.

----------
nosy: +rhettinger
status: pending -> open

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10701>
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