Ezio Melotti <ezio.melo...@gmail.com> added the comment:

My comment was referring to double try/except suggested by Eric.  Indeed the 
if/else might lead to a race condition, and that's a good reason to avoid LBYL 
-- even if on average calling hash() twice might be faster.
I'm happy with the fix you committed, thanks!

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<http://bugs.python.org/issue13177>
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