[issue444582] Finding programs in PATH, adding shutil.which

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

I'm fine with this version going in, but I don't understand what you are saying about PATHEXT.  You are getting it from the environment, but you say the shell always looks at the extension.  So if someone has changed PATHEXT in their environment, Windows ignores it and does the associations it knows about anyway?  That is, PATHEXT is purely informational and changing it has no effect (other than to confuse things)?

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<http://bugs.python.org/issue444582>
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