diff options
Diffstat (limited to 'Lib/argparse.py')
| -rw-r--r-- | Lib/argparse.py | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Lib/argparse.py b/Lib/argparse.py index 072cd5e7dc0..5ecfdca1717 100644 --- a/Lib/argparse.py +++ b/Lib/argparse.py @@ -863,6 +863,9 @@ class BooleanOptionalAction(Action): _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) |