Python：找到从这个继承的所有类？ [英] Python: find all classes which inherit from this one?

问题描述

在python中是否有任何方法可以查询从特定类继承的类的命名空间？给定一个类小部件我希望能够调用类似的继承者（小部件）来获取一个列表所有我不同类型的小部件。

Is there any way in python to query a namespace for classes which inherit from a particular class? Given a class widget I'd like to be able to call something like inheritors(widget) to get a list of all my different kinds of widget.

推荐答案

你想使用小部件.__子类__（）获取所有子类的列表。它只查找直接子类，但如果你想要所有这些，你将不得不做更多的工作：

You want to use Widget.__subclasses__() to get a list of all the subclasses. It only looks for direct subclasses though so if you want all of them you'll have to do a bit more work:

def inheritors(klass):
    subclasses = set()
    work = [klass]
    while work:
        parent = work.pop()
        for child in parent.__subclasses__():
            if child not in subclasses:
                subclasses.add(child)
                work.append(child)
    return subclasses

NB如果您使用的是Python 2.x，则仅适用于新式类。

N.B. If you are using Python 2.x this only works for new-style classes.

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