编写一个动物类 Animal ，具有属性：名称和重量；具有功能：吃、睡。子类 Bird 和 Dog 继承了父类 Animal ，具有自己的属性，如翅膀和四肢等，同时改写父类的方法。使用 main 方法去测试所编写的类。

好的，我可以回答这个问题。以下是 Animal 类的代码：

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

    def eat(self):
        print(f"{self.name} is eating.")

    def sleep(self):
        print(f"{self.name} is sleeping.")

以下是 Bird 类的代码：

class Bird(Animal):
    def __init__(self, name, weight, wings):
        super().__init__(name, weight)
        self.wings = wings

    def fly(self):
        print(f"{self.name} is flying with {self.wings} wings.")

    def sleep(self):
        print(f"{self.name} is sleeping on a tree.")

以下是 Dog 类的代码：

class Dog(Animal):
    def __init__(self, name, weight, legs):
        super().__init__(name, weight)
        self.legs = legs

    def bark(self):
        print(f"{self.name} is barking.")

    def sleep(self):
        print(f"{self.name} is sleeping in a dog house.")

以下是 main 方法的代码：

def main():
    bird = Bird("Eagle", 5, 2)
    bird.eat()
    bird.fly()
    bird.sleep()

    dog = Dog("Buddy", 10, 4)
    dog.eat()
    dog.bark()
    dog.sleep()

if __name__ == "__main__":
    main()

输出结果如下：

Eagle is eating.
Eagle is flying with 2 wings.
Eagle is sleeping on a tree.
Buddy is eating.
Buddy is barking.
Buddy is sleeping in a dog house.

希望这个回答能够帮助到你。