python-如何获取内部类的列表? [英] python - how to get a list of inner classes?

问题描述

我正在编写一个包含一些嵌套类的小型Python应用程序，如下例所示:

I'm writing a small Python application that contains a few nested classes, like the example below:

class SuperBar(object):
    pass

class Foo(object):
    NAME = 'this is foo'

    class Bar(SuperBar):
        MSG = 'this is how Bar handle stuff'

    class AnotherBar(SuperBar):
        MSG = 'this is how Another Bar handle stuff'

我正在使用嵌套类创建某种层次结构，并提供一种实现解析器功能的干净方法.

I'm using nested classes to create some sort of hierarchy and to provide a clean way to implement features for a parser.

在某个时候，我想创建一个内部类的列表.我想要以下输出:

At some point, I want to create a list of the inner classes. I'd like to have the following output:

[<class '__main__.Bar'>, <class '__main__.AnotherBar'>]

问题是:以pythonic方式获取内部类列表的推荐方法是什么?

推荐答案

我设法通过以下方法获取内部类对象的列表:

I managed to get a list of inner class objects with the method below:

import inspect

def inner_classes_list(cls):
    return [cls_attribute for cls_attribute in cls.__dict__.values()
            if inspect.isclass(cls_attribute)
            and issubclass(cls_attribute, SuperBar)]

它有效，但是我不确定直接使用__dict__是否是一件好事.我之所以使用它，是因为它包含了我需要的实际class实例，并且似乎可以跨Python 2和3移植.

It works, but I'm not sure if using __dict__ directly is a good thing to do. I'm using it because it contains the actual class instances that I need and seems to be portable across Python 2 and 3.

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