[issue7944] Use the 'with' statement in conjunction with 'open' throughout test modules

[Giampaolo Rodola']

Giampaolo Rodola' <g.rodola at gmail.com> added the comment:

Here is a patch for test_os.py.

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nosy: +giampaolo.rodola
Added file: http://bugs.python.org/file19218/test_os.patch

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