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bpo-38531: document extend action's added version (GH-16865)

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Batuhan Taşkaya 2019-10-20 23:13:54 +03:00 • committed by Raymond Hettinger
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Doc/library/argparse.rst
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@ -838,6 +838,8 @@ how the command-line arguments should be handled. The supplied actions are:
>>> parser.parse_args(["--foo", "f1", "--foo", "f2", "f3", "f4"])
Namespace(foo=['f1', 'f2', 'f3', 'f4'])
.. versionadded:: 3.8
You may also specify an arbitrary action by passing an Action subclass or
other object that implements the same interface. The ``BooleanOptionalAction``
is available in ``argparse`` and adds support for boolean actions such as