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

[Rafik Draoui]

Rafik Draoui added the comment:

Here is a patch with an implementation of os.path.commonpath, along with tests and documentation. At the moment, this is only implemented for POSIX, as I don't feel like I know enough about Windows to tackle drive letters and UNC in paths without spending some more time on it.

This probably needs more tests for corner cases.

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nosy: +rafik
Added file: http://bugs.python.org/file27883/patch10395

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