在Python中使用基类构造函数作为工厂？

class Animal:
    def __init__(self, name):
        self.name = name

    def speak(self):
        pass

class Dog(Animal):
    def speak(self):
        return f"{self.name} says Woof!"

class Cat(Animal):
    def speak(self):
        return f"{self.name} says Meow!"

def animal_factory(animal_type, name):
    if animal_type.lower() == "dog":
        return Dog(name)
    elif animal_type.lower() == "cat":
        return Cat(name)
    else:
        raise ValueError("Invalid animal type")

# 使用工厂创建Dog和Cat实例
dog = animal_factory("dog", "Rex")
cat = animal_factory("cat", "Luna")

print(dog.speak())  # 输出 "Rex says Woof!"
print(cat.speak())  # 输出 "Luna says Meow!"