代码如下:

class Bird:  
    def __init__(self):  
        self.hungry = True  
    def eat(self):  
        if self.hungry:  
            print "Ahaha..."  
            self.hungry = False  
        else:  
            print "No, Thanks!"  
  
class SingBird(Bird):  
    def __init__(self):  
        super(SingBird,self).__init__()  
        self.sound = 'squawk'  
    def sing(self):  
        print self.sound  
>>> sb = SingBird()  
Traceback (most recent call last):  
  File "<pyshell#5>", line 1, in <module>  
    sb = SingBird()  
  File "D:\Learn\Python\Person.py", line 51, in __init__  
    super(SingBird,self).__init__()  
TypeError: must be type, not classobj  

【错误分析】在模块首行里面加上__metaclass__=type，具体还没搞清楚为什么要加

代码如下:

__metaclass__=type  
class Bird:  
    def __init__(self):  
        self.hungry = True  
    def eat(self):  
        if self.hungry:  
            print "Ahaha..."  
            self.hungry = False  
        else:  
            print "No, Thanks!"  
  
class SingBird(Bird):  
    def __init__(self):  
        super(SingBird,self).__init__()  
        self.sound = 'squawk'  
    def sing(self):  
        print self.sound  
>>> S = SingBird()  
>>> S.  
SyntaxError: invalid syntax  
>>> S.  
SyntaxError: invalid syntax  
>>> S.eat()  
Ahaha...