Class BadMapping

Lib/test/test_str.py:1456–1458

        self.assertRaises(ValueError, '{a} {}'.format_map, {"a" : 2, "b" : 1})

        class BadMapping:
            def __getitem__(self, key):
                return 1/0
        self.assertRaises(KeyError, '{a}'.format_map, {})
        self.assertRaises(TypeError, '{a}'.format_map, [])
        self.assertRaises(ZeroDivisionError, '{a}'.format_map, BadMapping())