[issue20970] contradictory documentation for prog option of argparse

[paul j3]

paul j3 added the comment:

Yes, the documentation is accurate but a bit vague.  It doesn't say how 'it uses sys.arg[0]'.  The example implies it uses 'basename'. So the question is, whether that implementation detail should be more explicit?

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nosy: +paul.j3

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<http://bugs.python.org/issue20970>
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