Nick Coghlan <ncogh...@gmail.com> added the comment:

A new function sounds like a good solution to me. How about just calling
it "os.path.commonpath" though?

I agree having a path component based prefix function in os.path is
highly desirable, particularly since the addition of relpath in 2.6:

base_dir = os.path.commonpath(paths)
rel_paths = [os.path.relpath(p, base_dir) for p in paths]

----------
nosy: +ncoghlan

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<http://bugs.python.org/issue4755>
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