[issue16817] test___all__ affects other tests by doing too much importing

[Eli Bendersky]

Changes by Eli Bendersky <eliben at gmail.com>:


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title: test___all__ has to save and restore sys.modules while it does all the importing -> test___all__ affects other tests by doing too much importing

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16817>
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