import random


class PetShop:

  """寵物商店"""

  def __init__(self, animal_factory=None):

    """寵物工廠是我們的抽象工廠。我們可以隨意設(shè)置。""" 
    self.pet_factory = animal_factory

  def show_pet(self):

    """使用抽象工廠創(chuàng)建并顯示一個寵物"""

    pet = self.pet_factory.get_pet()
    print("我們有一個可愛的 {}".format(pet))
    print("它說 {}".format(pet.speak()))
    print("我們還有 {}".format(self.pet_factory.get_food()))


# 工廠生產(chǎn)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 "貓糧"


# 隨機(jī)創(chuàng)建合適的工廠
def get_factory():
  """讓我們動起來！"""
  return random.choice([DogFactory, CatFactory])()


# 多個工廠顯示寵物
if __name__ == "__main__":
  for i in range(4):
    shop = PetShop(get_factory())
    shop.show_pet()
    print("=" * 20)