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simple fix: Update argparse.py #130620

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simple fix: Update argparse.py #130620

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2 changes: 1 addition & 1 deletion Lib/argparse.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1582,7 +1582,7 @@ def _get_optional_kwargs(self, *args, **kwargs):
long_option_strings = []
for option_string in args:
# error on strings that don't start with an appropriate prefix
if not option_string[0] in self.prefix_chars:
if option_string[0] not in self.prefix_chars:
raise ValueError(
f'invalid option string {option_string!r}: '
f'must start with a character {self.prefix_chars!r}')
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