paul j3 added the comment:
This patch addresses both issues raised here:
- throw an error when the subparser argument is missing
- allow the subparser argument to be optional
argparse.py:
_SubParsersAction -
add 'required=True' keyword.
name(self) method - creates a name of the form {cmd1,cmd2} for error
messages.
_get_action_name() - try action.name() if it can't get a name from
option_strings, dest or metavar. Still can return None.
2 error cases do a join on a list of action_names. If a name is None, this
will choke. Add a ['%s'%x for x in list] guard.
test_argparse.py:
add cases to the subparser block to test the 'required' keyword, and to test
the error message changes.
argparse.rst:
add a summary of the add_subparsers() arguments.
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Added file: http://bugs.python.org/file29793/required.patch
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<http://bugs.python.org/issue9253>
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