如何让一个函数创建同一个类的多个不同类型

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

class Dog(Animal):
    def sound(self):
        return "Woof!"
    
class Cat(Animal):
    def sound(self):
        return "Meow!"

def create_animal(animal_type, name):
    if animal_type == "dog":
        return Dog(name)
    elif animal_type == "cat":
        return Cat(name)
    else:
        return None

# 创建一个狗对象
dog = create_animal("dog", "Buddy")
print(dog.sound())  # 输出: Woof!

# 创建一个猫对象
cat = create_animal("cat", "Kitty")
print(cat.sound())  # 输出: Meow!