gh-77956: Add the words 'default' and 'version' help text localizable by eamanu · Pull Request #12711 · python/cpython (original) (raw)

This needs tests and I am not sure how to test this since argparse lacks localization tests. As noted by paul.j3 I am not sure how worthy enough it is to make this change that doesn't have tests and something the user can override by having a custom help formatter.

Sample program where I directly patch gettext so that translation just gives uppercase of the word :

python3 ../backups/bpo33775.py --help
USAGE: bpo33775.py [-h] [-a A]

OPTIONAL ARGUMENTS:
  -h, --help  SHOW THIS HELP MESSAGE AND EXIT
  -a A        Test help (default: 1)

./python.exe ../backups/bpo33775.py --help
Traceback (most recent call last):
  File "../backups/bpo33775.py", line 12, in <module>
    args = parser.parse_args()
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/argparse.py", line 1746, in parse_args
    args, argv = self.parse_known_args(args, namespace)
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/argparse.py", line 1778, in parse_known_args
    namespace, args = self._parse_known_args(args, namespace)
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/argparse.py", line 1984, in _parse_known_args
    start_index = consume_optional(start_index)
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/argparse.py", line 1924, in consume_optional
    take_action(action, args, option_string)
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/argparse.py", line 1852, in take_action
    action(self, namespace, argument_values, option_string)
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/argparse.py", line 1034, in __call__
    parser.print_help()
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/argparse.py", line 2471, in print_help
    self._print_message(self.format_help(), file)
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/argparse.py", line 2455, in format_help
    return formatter.format_help()
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/argparse.py", line 281, in format_help
    help = self._root_section.format_help()
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/argparse.py", line 212, in format_help
    item_help = join([func(*args) for func, args in self.items])
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/argparse.py", line 212, in <listcomp>
    item_help = join([func(*args) for func, args in self.items])
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/argparse.py", line 212, in format_help
    item_help = join([func(*args) for func, args in self.items])
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/argparse.py", line 212, in <listcomp>
    item_help = join([func(*args) for func, args in self.items])
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/argparse.py", line 522, in _format_action
    help_text = self._expand_help(action)
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/argparse.py", line 611, in _expand_help
    return self._get_help_string(action) % params
KeyError: 'DEFAULT'