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

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

LookupError sounds good.  About the latest patch: I wonder if using !a instead of !r in the format strings for exceptions would be more helpful (maybe you’ve seen a recent python-dev subthread about that).  I don’t like seeing escapes for perfectly common characters like ß or é, but OTOH escapes help disambiguating different characters that look the same.  Apart from these two points, this is good to go.

A doc addition for LookupError would be an independent changeset; it has nothing to do with adding shutil.chown.

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