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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Here is revised patch. The behavior is changed in correspondence with results of Python-ideas discussion, extended tests, fixed several bugs.

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keywords: +patch
stage: commit review -> patch review
Added file: http://bugs.python.org/file35942/ospath_commonpath.patch

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