如何扩展 Python 类初始化

2022-01-18 00:00:00 python class inheritance initialization

问题描述

我已经创建了一个基类:

I have created a base class:

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

我想扩展类并添加到 init 方法中，以便 SubThing 同时具有 name 和 time 属性.我该怎么做?

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)

任何帮助都会很棒.

解决方案

可以在子类中定义__init__，调用super来调用父类的__init__ 适当的方法:

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()

确保你的基类是 object 的子类，因为 super 不适用于旧式类:

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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