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bpo-46080: fix argparse help generation exception in edge case (GH-30111)

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Fix an uncaught exception during help text generation when
argparse.BooleanOptionalAction is used with default=argparse.SUPPRESS
and help is specified.
(cherry picked from commit 9e87c0e03f)

Co-authored-by: Felix Fontein <felix@fontein.de>
This commit is contained in:
Miss Islington (bot) 2022-01-20 15:13:17 -08:00 • committed by GitHub
parent 876ade1ae3
commit e5edc8d737
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3 changed files with 9 additions and 3 deletions
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7
Lib/test/test_argparse.py
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@ -3597,6 +3597,8 @@ class TestHelpUsage(HelpTestCase):
Sig('--bar', help='Whether to bar', default=True,
action=argparse.BooleanOptionalAction),
Sig('-f', '--foobar', '--barfoo', action=argparse.BooleanOptionalAction),
Sig('--bazz', action=argparse.BooleanOptionalAction,
default=argparse.SUPPRESS, help='Bazz!'),
]
argument_group_signatures = [
(Sig('group'), [
@ -3609,8 +3611,8 @@ class TestHelpUsage(HelpTestCase):
usage = '''\
usage: PROG [-h] [-w W [W ...]] [-x [X ...]] [--foo | --no-foo]
[--bar | --no-bar]
[-f | --foobar | --no-foobar | --barfoo | --no-barfoo] [-y [Y]]
[-z Z Z Z]
[-f | --foobar | --no-foobar | --barfoo | --no-barfoo]
[--bazz | --no-bazz] [-y [Y]] [-z Z Z Z]
a b b [c] [d ...] e [e ...]
'''
help = usage + '''\
@ -3627,6 +3629,7 @@ class TestHelpUsage(HelpTestCase):
--foo, --no-foo Whether to foo
--bar, --no-bar Whether to bar (default: True)
-f, --foobar, --no-foobar, --barfoo, --no-barfoo
--bazz, --no-bazz Bazz!
group:
-y [Y] y