[issue12191] Add shutil.chown to allow to use user and group name (and not only uid/gid)

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

I wonder if we should raise LookupError for unknown uids/gids. Do we have other APIs with similar semantics?

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nosy: +pitrou

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<http://bugs.python.org/issue12191>
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