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我在Python中找到了这个抽象工厂模式的例子。我试图理解为什么需要有一个DogFactory,它不会是较小的代码只是调用Dog类,有人可以解释这种模式将如何在现实世界的应用程序中有用试图使Python中的抽象工厂模式有意义
class Dog:
def speak(self):
return "Woof!"
def __str__(self):
return "Dog"
class DogFactory:
def get_pet(self):
return Dog()
def get_food(self):
return "Dog Food!"
class PetStore:
def __init__(self, pet_factory=None):
self._pet_factory = pet_factory
def show_pet(self):
pet = self._pet_factory.get_pet()
pet_food = self._pet_factory.get_food()
print("Our pet is '{}'!".format(pet))
print("Our pet says hello by '{}'".format(pet.speak()))
print("Its food is '{}'!".format(pet_food))
factory = DogFactory()
shop = PetStore(factory)
shop.show_pet()