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gh-109475: argument get the value is -- #110959

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gh-109475: argument get the value is -- #110959

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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 @@ -2536,6 +2536,9 @@ def _get_values(self, action, arg_strings):
elif action.nargs == SUPPRESS:
value = SUPPRESS

elif len(arg_strings) == 0:
value = '--'

# all other types of nargs produce a list
else:
value = [self._get_value(action, v) for v in arg_strings]
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6 changes: 6 additions & 0 deletions Lib/test/test_argparse.py
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Expand Up @@ -5405,6 +5405,12 @@ def test_zero_or_more_optional(self):
args = parser.parse_args([])
self.assertEqual(NS(x=[]), args)

def test_double_dash(self):
parser = argparse.ArgumentParser()
parser.add_argument('--foo')
args = parser.parse_args(['--foo=--'])
self.assertEqual(NS(foo='--'), args)


# ===========================
# parse_intermixed_args tests
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