[issue13475] Add '--mainpath'/'--nomainpath' command line options to override sys.path[0] initialisation

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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pull_requests: +29665
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/31542

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue13475>
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