[issue30362] Launcher add list and list with paths options

[Eryk Sun]

Eryk Sun added the comment:

I'm -0 on the "-0" option, but I think printing the list of registered Python installations would be useful in the --help text and when the launcher fails to find a requested version.

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nosy: +eryksun

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30362>
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