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gh-59330: Improve error message for dest= for positionals (GH-125215)

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Also improve the documentation. Specify how dest and metavar are derived
from add_argument() positional arguments.

Co-authored-by: Simon Law <sfllaw@sfllaw.ca>
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Serhiy Storchaka 2024-10-12 14:46:28 +03:00 • committed by GitHub
parent eb2d268ac7
commit a6c0c64de0
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3 changed files with 23 additions and 2 deletions
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3
Lib/test/test_argparse.py
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@ -5411,7 +5411,8 @@ class TestInvalidArgumentConstructors(TestCase):
parser.add_argument(dest='foo')
with self.assertRaises(ValueError) as cm:
parser.add_argument('bar', dest='baz')
self.assertIn('dest supplied twice for positional argument',
self.assertIn('dest supplied twice for positional argument,'
' did you mean metavar?',
str(cm.exception))
def test_no_argument_actions(self):