如何扩展Python类init [英] How to extend Python class init

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本文介绍了如何扩展Python类init的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我已经创建了一个基类:

  class Thing():
def __init __(self,name) :
self.name = name



我想扩展类并添加到 init 方法,所以 SubThing name time 属性。

  class SubThing(Thing):
#这里为了扩展init并添加一个time属性

def __repr __(self):
return'<%s%s>'%(self.name,self.time)
解决方案

p>你可以在子类中定义 __ init __ 并调用 super 来调用父类的 __init __ 方法:

  class SubThing(Thing):
def __init __ * args,** kwargs):
super(SubThing,self).__ init __(* args,** kwargs)
self.time = datetime.now()

请确保你的基类从 object c> super 不能使用旧式类:

  class Thing 
...


I have created a base class:

class Thing():
    def __init__(self, name):
        self.name = name

I want to extend the class and add to the init method so the that SubThing has both a name and a time property. How do I do it?

class SubThing(Thing):
    # something here to extend the init and add a "time" property

    def __repr__(self):
        return '<%s %s>' % (self.name, self.time)

Any help would be awesome.

解决方案

You can just define __init__ in the subclass and call super to call the parents' __init__ methods appropriately:

class SubThing(Thing):
    def __init__(self, *args, **kwargs):
        super(SubThing, self).__init__(*args, **kwargs)
        self.time = datetime.now()

Make sure to have your base class subclass from object though, as super won't work with old-style classes:

class Thing(object):
    ...

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