[issue14126] Speed up list comprehensions by preallocating the list where possible

[Philip Jenvey]

Philip Jenvey <pjenvey at underboss.org> added the comment:

iter(range(10000)) should also see a speedup because range's iter supports __length_hint__

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nosy: +pjenvey

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14126>
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