"""抽象工厂模式的实现"""
import random
class PetShop:
"""宠物商店"""
def __init__(self, animal_factory=None):
"""宠物工厂是我们的抽象工厂。我们可以随意设置。"""
self.pet_factory = animal_factory
def show_pet(self):
"""使用抽象工厂创建并显示一个宠物"""
pet = self.pet_factory.get_pet()
print("我们有一个可爱的 {}".format(pet))
print("它说 {}".format(pet.speak()))
print("我们还有 {}".format(self.pet_factory.get_food()))
# 工厂生产的事物
class Dog:
def speak(self):
return "汪"
def __str__(self):
return "Dog"
class Cat:
def speak(self):
return "喵"
def __str__(self):
return "Cat"
# Factory classes
class DogFactory:
def get_pet(self):
return Dog()
def get_food(self):
return "狗食"
class CatFactory:
def get_pet(self):
return Cat()
def get_food(self):
return "猫粮"
# 随机创建合适的工厂
def get_factory():
"""让我们动起来！"""
return random.choice([DogFactory, CatFactory])()
# 多个工厂显示宠物
if __name__ == "__main__":
for i in range(4):
shop = PetShop(get_factory())
shop.show_pet()
print("=" * 20)结果如图: