[issue13475] Add '-p'/'--path0' command line option to override sys.path[0] initialisation

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

FWIW, I now think this should *only* be a long option. Short options are precious, and this is an unusual enough use case that I'm not yet sure it deserves one.

In particular, we may decide to use "-p" later for adding directories to sys.path, rather than specifically overriding sys.path[0]

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