Method __getattr__

Lib/unittest/mock.py:330–334

(self, name)

        self._sentinels = {}

    def __getattr__(self, name):
        if name == '__bases__':
            # Without this help(unittest.mock) raises an exception
            raise AttributeError
        return self._sentinels.setdefault(name, _SentinelObject(name))

    def __reduce__(self):
        return 'sentinel'