继承与构造方法～继续话痨～～

__metaclass__=type
class Bird:
    def __init__(self):
        self.hungry = True
    def eat(self):
        if self.hungry:
            print 'Aaaah...'
            self.hungry = False
        else:
            print "No,thanks!"

class SongBird(Bird):
    def __init__(self):
        #Bird.__init__(self)
        super(SongBird, self).__init__()
        self.sound = 'Squawk'
    def sing(self):
        print self.sound

songbird = SongBird()
songbird.sing()
songbird.eat()
songbird.eat()
print "**********Done!Tada!!**********"

上面这段代码核心是：如何继承super类～重点是：

__metaclass__=type

<pre name="code" class="python">super(SongBird, self).__init__()