[issue7117] Backport py3k float repr to trunk

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

Adding tim_one as nosy. He'll no doubt have an opinion on rounding. And
hopefully he'll share it!

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nosy: +tim_one

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7117>
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