玩具工厂

题目描述：工厂模式是一种常见的设计模式。请实现一个玩具工厂 ToyFactory 用来产生不同的玩具类。可以假设只有猫和狗两种玩具。

样例：

做法跟上一道题“形状工厂”（详见：点击打开链接）是一致的，甚至还要更简单一些，基本的做法我在“形状工厂”中已经讲解过，此处省略，直接给出代码：

"""Your object will be instantiated and called as such:ty = ToyFactory()toy = ty.getToy(type)toy.talk()"""class Toy:    def talk(self):        raise NotImplementedError('This method should have implemented.')class Dog(Toy):    def talk(self):        print("Wow")    # Write your code hereclass Cat(Toy):    def talk(self):        print("Meow")    # Write your code hereclass ToyFactory:    # @param {string} shapeType a string    # @return {Toy} Get object of the type    def getToy(self, type):        if type == "Dog":            return Dog()        elif type == "Cat":            return Cat(Toy)        # Write your code here