R. David Murray <rdmur...@bitdance.com> added the comment:

In the case of 'lists' an object is being allocated each time through the inner 
loop.  In the case of simple_lists, no such allocation is being done.  Your 
timing issues are probably related to the memory allocation behavior of your 
system.

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nosy: +r.david.murray

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13351>
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