python类的继承

class Bird:
    def __init__(self):
        self.eaten = False
    def eat(self):
        if(self.eaten == False):
            self.eaten = True
            print("Eating now")
        else:
            print("no,thinks")
    @staticmethod
    def fly():
        print('''I believe I can fly,
              I believe i can hold the sky''')
class SingBird(Bird):
    def __init__(self):
        super(SingBird,self).__init__() #必须加上__init__，否则解释器会提示Singbird没有eat的属性。
        self.sound = "zzz,zzz"
    def sing(self):
        print(self.sound)
singBird = SingBird()
singBird.sing()
singBird.eat()
singBird.eat()
singBird.fly()

运行的结果：

　　

zzz,zzz
Eating now
no,thinks
I believe I can fly,
I believe i can hold the sky