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

[Sandro Tosi]

Sandro Tosi <sandro.tosi at gmail.com> added the comment:

grepping over the stdlib, LookupError is only used in codecs exception; also the documentation of LE is "The base class for the exceptions that are raised when a key or index used on a mapping or sequence is invalid: IndexError, KeyError. This can be raised directly by codecs.lookup()." so I guess it's not the right exception of this case.

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