def __missing__(self, key):
        if self.default_factory is None:
            raise KeyError(key)
        else:
            ret = self[key] = self.default_factory(name=key)
            return ret
def test_boolean_with_python_bool(self):
        """Input that is already a native python `bool` should be passed through
        without extra processing."""
        assert_equal(inputs.boolean(True), True)
        assert_equal(inputs.boolean(False), False)