在Python中将对象转换为子类？

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

    def speak(self):
        return "I am an animal"

class Dog(Animal):
    def speak(self):
        return "Woof, woof!"

class Cat(Animal):
    def speak(self):
        return "Meow, meow!"

def convert_to_subclass(obj, subclass):
    obj.__class__ = subclass
    return obj

# 创建一个Animal对象
animal = Animal("Animal")
print(animal.speak())  # 输出 "I am an animal"

# 将Animal对象转换为Dog子类
dog = convert_to_subclass(animal, Dog)
print(dog.speak())  # 输出 "Woof, woof!"

# 将Animal对象转换为Cat子类
cat = convert_to_subclass(animal, Cat)
print(cat.speak())  # 输出 "Meow, meow!"