[issue3177] Add shutil.open

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> dependencies: + Finding programs in PATH, adding shutil.which

Why did you add this dependency? For example, subprocess is able to locate a program if the program has no full path. We don't need a which function.

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nosy: +haypo

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<http://bugs.python.org/issue3177>
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