Method __call__

Lib/test/test_argparse.py:2284–2305

(self, parser, namespace, value, option_string=None)

    class PositionalAction(argparse.Action):

        def __call__(self, parser, namespace, value, option_string=None):
            try:
                assert option_string is None, ('option_string: %s' %
                                               option_string)
                # check destination
                assert self.dest == 'badger', 'dest: %s' % self.dest
                # when argument is before option, spam=0.25, and when
                # option is after argument, spam=<whatever was set>
                expected_ns = NS(badger=2)
                if value in [42, 84]:
                    expected_ns.spam = 0.25
                elif value in [1]:
                    expected_ns.spam = 0.625
                elif value in [2]:
                    expected_ns.spam = 0.125
                else:
                    raise AssertionError('value: %s' % value)
                assert expected_ns == namespace, ('expected %s, got %s' %
                                                  (expected_ns, namespace))
            except AssertionError as e:
                raise ArgumentParserError('arg_action failed: %s' % e)
            setattr(namespace, 'badger', value)

    argument_signatures = [
        Sig('-s', dest='spam', action=OptionalAction,