[issue13402] Document absoluteness of sys.executable

[Philip Jenvey]

Philip Jenvey <pjenvey at underboss.org> added the comment:

sys.executable can be None on Jython (and I believe IronPython) when ran in an 'embedded' mode

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nosy: +dino.viehland, pjenvey

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<http://bugs.python.org/issue13402>
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