python 面向对象__call__

[oracle@node01 0914]$ cat a1.py 
class Person(object):
    def __init__(self, name, gender):
        self.name = name
        self.gender = gender
    def query(self,friend):
        print self.name
        print self.gender
        self.friend=friend
        print self.friend
 
h=Person('aa','bb')
h.query('cc')


[oracle@node01 0914]$ python a1.py 
aa
bb
cc
[oracle@node01 0914]$ 



[oracle@node01 0914]$ cat a2.py 
class Person(object):
    def __init__(self, name, gender):
        self.name = name
        self.gender = gender
    def __call__(self,friend):
        print self.name
        print self.gender
        self.friend=friend
        print self.friend
p=Person('Bob', 'male')
p('Tim')
[oracle@node01 0914]$ python a2.py 
Bob
male
Tim

一个类实例也可以变成一个可调用对象，只需要实现一个特殊方法__call__()。