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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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Lib/argparse.py
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@ -1424,7 +1424,8 @@ class _ActionsContainer(object):
chars = self.prefix_chars
if not args or len(args) == 1 and args[0][0] not in chars:
if args and 'dest' in kwargs:
raise ValueError('dest supplied twice for positional argument')
raise ValueError('dest supplied twice for positional argument,'
' did you mean metavar?')
kwargs = self._get_positional_kwargs(*args, **kwargs)
# otherwise, we're adding an optional argument