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用工厂模式实现一个玩具工厂，该工厂只生产猫和狗两种玩具
参考代码:
class Toy:
def talk(self):
raise NotImplementedError("This method should have implemented")
class Dog(Toy):
def talk(self):
print("Wow")
class Cat(Toy):
def talk(self):
print("Meow")
class ToyFactory:
def getToy(self, type):
if type == "Dog":
return Dog()
elif type == "Cat":
return Cat()
return None