[issue33109] argparse: make new 'required' argument to add_subparsers default to False instead of True

[Lucas Cimon]

Lucas Cimon <lucas.cimon at gmail.com> added the comment:

Reporting a duplicate / superseder with the following bug:

parser = argparse.ArgumentParser()
subparsers = parser.add_subparsers(required=True)
subparsers.add_parser('foo')
parser.parse_args()

Raising:

TypeError: sequence item 0: expected str instance, NoneType found

It has already been reported in https://bugs.python.org/issue29298
with an interesting solution by Greg Minshall.

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nosy: +Lucas Cimon

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<https://bugs.python.org/issue33109>
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