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

[Brian Curtin]

Brian Curtin <brian at python.org> added the comment:

Here's a patch that also works on linux. A pathext specific test is now skipped since that only matters on Windows, and I forgot a chmod that was making two tests fail on linux.

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Added file: http://bugs.python.org/file26078/issue444582_v3.diff

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