[issue7333] Add initgroups to the posix/os modules

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

You can use the new test-skipping feature:
http://docs.python.org/dev/library/unittest.html#skipping-tests-and-expected-failures

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nosy: +pitrou

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<http://bugs.python.org/issue7333>
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