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

[Anthony Sottile]

Anthony Sottile <asottile at umich.edu> added the comment:

Considering the huge popularity of these SO questions, I don't think this should be reverted:

- https://stackoverflow.com/questions/23349349/argparse-with-required-subparser
- https://stackoverflow.com/questions/22990977/why-does-this-argparse-code-behave-differently-between-python-2-and-3

See also: the confusion caused by the 3.3 change: https://bugs.python.org/issue9253

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