def __init__(self):

        self.flying = True

​

    def birdsong(self):

        print("새소리")

​

​

class Sparrow(Bird):

    def birdsong(self):

        print("짹짹")

​

​

class Chicken(Bird):

    def __init__(self):

        self.flying = False

​

​

my_sparrow = Sparrow()

my_chicken = Chicken()

​

my_sparrow.birdsong()

my_chicken.birdsong()

​