Python_15

1.

__metaclass__=type#使用新类，否则super方法会出错class bird:    def __init__(self):        self.hungry=True    def eat(self):        if self.hungry:            print 'Aaaah...'        else:            print 'No, thanks!'class songBird(bird):    def __init__(self):        super(songBird,self).__init__()        self.sound='Squark!'    def sing(self):        print self.sound

构造方法init。

>>> sb=songBird()>>> sb.eat()Aaaah...>>> sb.sing()Squark!