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bpo-42501: Revise the usage note for Enums with the choices (GH-23563)

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Raymond Hettinger 2020-11-30 09:55:13 -08:00 committed by GitHub
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Doc/library/argparse.rst
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@ -1133,20 +1133,9 @@ container should match the type_ specified::
Any container can be passed as the *choices* value, so :class:`list` objects, Any container can be passed as the *choices* value, so :class:`list` objects,
:class:`set` objects, and custom containers are all supported. :class:`set` objects, and custom containers are all supported.
This includes :class:`enum.Enum`, which could be used to restrain
argument's choices; if we reuse previous rock/paper/scissors game example,
this could be as follows::
>>> from enum import Enum Use of :class:`enum.Enum` is not recommended because it is difficult to
>>> class GameMove(Enum): control its appearance in usage, help, and error messages.
... ROCK = 'rock'
... PAPER = 'paper'
... SCISSORS = 'scissors'
...
>>> parser = argparse.ArgumentParser(prog='game.py')
>>> parser.add_argument('move', type=GameMove, choices=GameMove)
>>> parser.parse_args(['rock'])
Namespace(move=<GameMove.ROCK: 'rock'>)
required required