[docs] [issue13402] Document absoluteness of sys.executable

[Petri Lehtinen]

Petri Lehtinen <petri at digip.org> added the comment:

Attaching an updated patch. The documentation now says that sys.executable may be an empty string. The patch also adds a test to make sure that sys.executable is absolute.

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Added file: http://bugs.python.org/file23958/issue13402_v2.patch

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