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

[STINNER Victor]

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

> You could also add a test to test_sys ensuring that sys.executable
> is always executable.

And that sys.executable is absolute?

sys.executable is an empty string if sys.argv[0] has been changed and Python is unable to retrieve the real path to the Python executable. See the issue #7774. The fact that sys.executable can be empty should be documented.

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