ABC documentation needs more details on usage

I am trying to use Abstract Base Classes. But I find the documentation lacking on several points that makes the matter too 'abstract'.

For example. There is no explanation on making abstract objects mandatory by using exceptions

Or how to implement Iterable abstract bsse class that can be inherited from and still be usable.

Can someone shed more light onto this so that the documentation is more accessible?

首先定位 Abstract Base Classes 文档，并检查其目前对抽象对象、异常和 Iterable 继承的覆盖情况。完成的标准是文档清楚地解释所请求的使用模式，并使示例对读者更易理解；issue 中没有指定具体的文件或测试。