[issue9351] argparse set_defaults on subcommands should override top level set_defaults

[paul j3]

paul j3 added the comment:

In http://bugs.python.org/issue27859 I've demonstrated how a subclass of _SubParsersAction can be used to revert the behavior to pre 2.7.9, passing the main namespace to the subparser.

The only other change is to the parser registry:

    parser.register('action', 'parsers', MyParserAction)

So there's no need to change the argparse.py file itself.

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<http://bugs.python.org/issue9351>
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