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gh-117941: Reject option names starting with "--no-" in argparse.BooleanOptionalAction #125894

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merged 4 commits into from
Nov 11, 2024
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gh-117941: Reject option names starting with "--no-" in argparse.BooleanOptionalAction #125894

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714c456
gh-117941: Reject option names starting with "--no-" in argparse.Bool…
serhiy-storchaka Oct 23, 2024
fd0752e
Update 2024-10-23-20-44-30.gh-issue-117941.Y9jdlW.rst
serhiy-storchaka Oct 23, 2024
53440cc
Merge branch 'main' into argparse-BooleanOptionalAction-no-no
serhiy-storchaka Nov 7, 2024
964cf12
Merge branch 'main' into argparse-BooleanOptionalAction-no-no
serhiy-storchaka Nov 7, 2024
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3 changes: 3 additions & 0 deletions Lib/argparse.py
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Original file line number Diff line number Diff line change
Expand Up @@ -863,6 +863,9 @@ def __init__(self,
_option_strings.append(option_string)

if option_string.startswith('--'):
if option_string.startswith('--no-'):
raise ValueError(f'invalid option name {option_string!r} '
f'for BooleanOptionalAction')
option_string = '--no-' + option_string[2:]
_option_strings.append(option_string)

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7 changes: 7 additions & 0 deletions Lib/test/test_argparse.py
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Expand Up @@ -789,6 +789,13 @@ def test_const(self):

self.assertIn("got an unexpected keyword argument 'const'", str(cm.exception))

def test_invalid_name(self):
parser = argparse.ArgumentParser()
with self.assertRaises(ValueError) as cm:
parser.add_argument('--no-foo', action=argparse.BooleanOptionalAction)
self.assertEqual(str(cm.exception),
"invalid option name '--no-foo' for BooleanOptionalAction")

class TestBooleanOptionalActionRequired(ParserTestCase):
"""Tests BooleanOptionalAction required"""

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2024-10-23-20-44-30.gh-issue-117941.Y9jdlW.rst
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@@ -0,0 +1,2 @@
:class:`!argparse.BooleanOptionalAction` now rejects option names starting
with ``--no-``.
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