from abc import ABCMeta, abstractmethod


class Animal(metaclass=ABCMeta):
    @abstractmethod
    def dizer_algo(self):
        return 'Eu sou um animal'


class Cachorro(Animal):
    def dizer_algo(self):
        s = super(Cachorro, self).dizer_algo()
        return '%s - %s' % (s, 'AU AU')


obj = Cachorro()
print(obj.dizer_algo())
