Jakub Wilk <jw...@jwilk.net> added the comment:

When PATH is empty string:
* zsh and FreeBSD which look for binaries in cwd.
* debianutils and GNU which always fail.

I suspect that the former is implementation accident. I can't imagine why would 
anyone want this behavior.

NB, POSIX says that when PATH is unset or empty, the path search is 
implementation-defined.

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<https://bugs.python.org/issue35755>
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