如何扩展Python类init

Question

我创建了一个基类:

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

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

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

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

任何帮助都是极好的.

Answer 1

您可以__init__在子类中定义并调用super以__init__适当地调用父类的方法:

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

确保具有基类子类,object但super不适用于旧式类:

class Thing(object):
    ...