[issue17012] Differences between /usr/bin/which and shutil.which()

[Barry A. Warsaw]

Barry A. Warsaw added the comment:

>From a documentation standpoint, path='' is not the same as "When no path is specified", so indeed it should return None when path=''.  Serhiy's patch looks good to me.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17012>
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