Abstract factory pattern

animals.py

class Dog(object):
    def speak(self):
        return "woof"


class Cat(object):
    def speak(self):
        return "meow"

change.py

class Komasan(object):

    def speak(self):
        return "mongeee"

class DogFactory(Factory):

    def get_pet(self):
        return Komasan()

no_pattern.py

def make_them_speak_no_pattern():
    d, c = Dog(), Cat()
    print d.speak()
    print c.speak()

with_pattern.py

class Factory(object):
    __metaclass__ = abc.ABCMeta

    @abstractmethod
    def get_pet(self):
        """"""


class DogFactory(Factory):

    def get_pet(self):
        return Dog()

class CatFactory(Factory):

    def get_pet(self):
        return Cat()


def make_them_speak():
    d, c = DogFactory().get_pet(), CatFactory().get_pet()
    print d.speak()
    print c.speak()