Python Meta Foo

class UniqueMeta(type):

    def __new__(cls, *foo, **kw):
        tmp = type.__new__(cls, *foo, **kw)
        tmp._COUNTER = 0
        return tmp


class UniquePizza(metaclass=UniqueMeta):

    def __init__(self):
        self.id = self._get_next_id()

    @classmethod
    def _get_next_id(cls):
        cls._COUNTER += 1
        print(repr(cls))
        return cls._COUNTER


class UniquePeperoniPizza(UniquePizza):

    pass

if __name__ == "__main__":

    a = UniquePizza()
    b = UniquePizza()
    p = UniquePeperoniPizza()

    print("a {}, b {}, p {}".format(a.id, b.id, p.id))