Class BadHash

Lib/test/mapping_tests.py:559–565

        self.assertRaises(KeyError, d.__getitem__, 23)

        class BadHash(object):
            fail = False
            def __hash__(self):
                if self.fail:
                    raise Exc()
                else:
                    return 42

        d = self._empty_mapping()
        x = BadHash()