[issue18346] Backporting of atomic file rename to Python 2.7

[Alexandr Zarubkin]

Changes by Alexandr Zarubkin <me21 at yandex.ru>:


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title: Backporting of issue 8828 to Python 2.7 -> Backporting of atomic file rename to Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18346>
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