http://blog.csdn.net/callinglove/article/details/45483097

 

讲了一大堆，

我也是用来理解类继承当中的参数行为的。

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在任何时候继承类和重写方法的，我们应当用到’*args’和’**kwargs’将接收到的位置参数和键值参数给父类方法。

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测试代码

#!/usr/bin/env python# -*- coding: utf-8 -*-class Model(object):    def __init__(self, name):        self.name = name    def save(self, force_update=False, force_insert=False):        if force_update and force_insert:            raise ValueError("Cannot perform both operations")        if force_update:            print "Updated an existing record"        if force_insert:            print "Created a new record"class ChildModel(Model):    def save(self, *args, **kwargs):        if self.name == 'abcd':            super(ChildModel, self).save(*args, **kwargs)        else:            return Nonec = ChildModel('abcd')c.save(force_insert=True)c.save(force_update=True)

 

结果