class Bird(object):
def __init__(self):
self.hungry = 1
def eat(self):
if self.hungry == 1:
print 'hungry...'
self.hungry = 0
else:
print 'No, thanks!'
class SongBird(Bird):
def __init__(self):
super(SongBird, self).__init__()
self.sound = 'Squawk!'
def sing(self):
print self.sound
sb = SongBird()
sb.sing()
sb.eat()
sb.eat()