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Commitad5e852

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bpo-39716: Raise on conflicting subparser names. (GH-18605)
Raise an ArgumentError when the same subparser name is added twice to anArgumentParser. This is consistent with the (default) behavior when thesame option string is added twice to an ArgumentParser.(Support for `conflict_handler="resolve"` could be considered as afollowup feature, although real use cases seem even rarer than"resolve"ing option-strings.)Automerge-Triggered-By: GH:rhettinger
1 parent9588f88 commitad5e852

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‎Lib/argparse.py

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@@ -1171,6 +1171,13 @@ def add_parser(self, name, **kwargs):
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aliases=kwargs.pop('aliases', ())
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ifnameinself._name_parser_map:
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raiseArgumentError(self,_('conflicting subparser: %s')%name)
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foraliasinaliases:
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ifaliasinself._name_parser_map:
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raiseArgumentError(
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self,_('conflicting subparser alias: %s')%alias)
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# create a pseudo-action to hold the choice help
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if'help'inkwargs:
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help=kwargs.pop('help')

‎Lib/test/test_argparse.py

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@@ -4804,6 +4804,19 @@ def test_resolve_error(self):
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--spam NEW_SPAM
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'''))
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deftest_subparser_conflict(self):
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parser=argparse.ArgumentParser()
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sp=parser.add_subparsers()
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sp.add_parser('fullname',aliases=['alias'])
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self.assertRaises(argparse.ArgumentError,
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sp.add_parser,'fullname')
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self.assertRaises(argparse.ArgumentError,
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sp.add_parser,'alias')
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self.assertRaises(argparse.ArgumentError,
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sp.add_parser,'other',aliases=['fullname'])
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self.assertRaises(argparse.ArgumentError,
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sp.add_parser,'other',aliases=['alias'])
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# =============================
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# Help and Version option tests
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@@ -0,0 +1,3 @@
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Raise an ArgumentError when the same subparser name is added twice to an
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`argparse.ArgumentParser`. This is consistent with the (default) behavior
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when the same option string is added twice to an ArgumentParser.

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