[issue18943] argparse: default args in mutually exclusive groups

[paul j3]

paul j3 added the comment:

I need to tweak the last patch so 'using_default' is also set when an "nargs='*'" positional is set to the '[]' default.

             if action.default is not None:
                 value = action.default
    +            using_default = True
             else:
                 value = arg_strings
    +            using_default = True  # tweak

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18943>
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