[Python-ideas] Argparse subparsers add required keyword

[George Leslie-Waksman]

With the stdlib argparse, subparsers can be defined and they can be marked
as required (though this is not documented) but they do not support a
"required" keyword. I think it would make everything more consistent if the
keyword existed.

This won't require any functional changes under the hood.

Right now, this works (and behaves as expected):

parser = argparse.ArgumentParser(...)
subparsers = parser.add_subparsers(...)
subparsers.required = True

but this does not:

parser = argparse.ArgumentParser(...)
subparsers = parser.add_subparsers(..., required=True)

--George
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