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bpo-42194: Add "New in version: 3.9" to argparse.BooleanOptionalAction (GH-23026)

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David Sanders 2021-07-13 01:19:54 +10:00 • committed by GitHub
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Doc/library/argparse.rst
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@ -853,6 +853,8 @@ is available in ``argparse`` and adds support for boolean actions such as
>>> parser.parse_args(['--no-foo'])
Namespace(foo=False)
.. versionadded:: 3.9
The recommended way to create a custom action is to extend :class:`Action`,
overriding the ``__call__`` method and optionally the ``__init__`` and
``format_usage`` methods.