[issue21301] pathlib missing Path.expandvars(env=os.environ)

[Berker Peksag]

Berker Peksag added the comment:

Here's a patch to implement expandvars() for PurePath (with tests and documentation update).

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keywords: +patch
nosy: +berker.peksag
stage:  -> patch review
Added file: http://bugs.python.org/file35252/issue21301.diff

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