[issue10395] new os.path function to extract common prefix based on path components

[Raymond Hettinger]

Raymond Hettinger added the comment:

This patch looks reasonable except for the doc change to os.path.commonprefix().   Remember, that function IS working as documented and that our policy is to document in an affirmative manner (here is what the function does and how to use it versus being preachy about "broken-by-design" etc.)

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nosy: +rhettinger

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10395>
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