Jan Killian <jan.kill...@gmail.com> added the comment:

Adapted Brian Curtin's http://bugs.python.org/file15381/
shutil_which.patch and made another reference implementation as a standalone 
module including the following fixes:

* uses ``PATHEXT`` on Windows
* searches current directory before ``PATH`` on Windows, but not before an 
explicitly passed path
* accepts both string or iterable for an explicitly passed path, or pathext
* accepts an explicitly passed empty path, or pathext (either '' or [])
* does not search ``PATH`` for files that have a path specified in their name 
already

Use any of these changes in the final shutil patch if you like to. The shutil 
module has availability 'Unix, Windows' after all.

----------
nosy: +iki
Added file: http://bugs.python.org/file16441/which.py

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