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Commita27c540

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[3.11]gh-96310: Fix a traceback in argparse when all options in a mutually exclusive group are suppressed (GH-96311) (GH-115768)
Reproducer depends on terminal size - the traceback occurs when there'san option long enough so the usage line doesn't fit the terminal width.Option order is also important for reproducibility.Excluding empty groups (with all options suppressed) from insertsfixes the problem.(cherry picked from commit5f7df88)Co-authored-by: Daniel Mach <daniel.mach@suse.com>
1 parent35e5bbc commita27c540

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‎Lib/argparse.py

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@@ -414,6 +414,8 @@ def _format_actions_usage(self, actions, groups):
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suppressed_actions_count+=1
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exposed_actions_count=group_action_count-suppressed_actions_count
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ifnotexposed_actions_count:
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continue
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ifnotgroup.required:
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ifstartininserts:

‎Lib/test/test_argparse.py

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@@ -2743,6 +2743,27 @@ def test_help(self):
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'''
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self.assertEqual(parser.format_help(),textwrap.dedent(expected))
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deftest_help_subparser_all_mutually_exclusive_group_members_suppressed(self):
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self.maxDiff=None
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parser=ErrorRaisingArgumentParser(prog='PROG')
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commands=parser.add_subparsers(title="commands",dest="command")
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cmd_foo=commands.add_parser("foo")
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group=cmd_foo.add_mutually_exclusive_group()
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group.add_argument('--verbose',action='store_true',help=argparse.SUPPRESS)
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group.add_argument('--quiet',action='store_true',help=argparse.SUPPRESS)
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longopt='--'+'long'*32
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longmeta='LONG'*32
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cmd_foo.add_argument(longopt)
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expected=f'''\
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usage: PROG foo [-h]
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[{longopt}{longmeta}]
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options:
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-h, --help show this help message and exit
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{longopt}{longmeta}
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'''
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self.assertEqual(cmd_foo.format_help(),textwrap.dedent(expected))
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deftest_empty_group(self):
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# See issue 26952
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parser=argparse.ArgumentParser()
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@@ -0,0 +1,2 @@
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Fix a traceback in:mod:`argparse` when all options in a mutually exclusive
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group are suppressed.

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