问题描述
在python中，每当我们编写用户定义的异常时，我们必须从类 Exception 中扩展它。
我的问题是为什么我们不能从 BaseException 中扩展它，这是异常层次结构的超类，异常也是 BaseException 的子类。
In python, whenever we are writing User-defined exception, we have to extend it from class Exception.my question is why can't we extend it from BaseException which is super-class of exception hierarchy and Exception is also subclass of BaseException.
推荐答案
BaseException 包括使用异常机制的 KeyboardInterrupt 和 SystemExit 大多数人不应该抓住。如果你熟悉的话，它类似于Java中的 Throwable 。直接从 BaseException 派生的东西通常旨在关闭系统，同时执行 finally 块和上下文管理器 __ exit __ 释放资源的方法。
BaseException includes things like KeyboardInterrupt and SystemExit, which use the exception mechanism, but which most people shouldn't be catching. It's analogous to Throwable in Java, if you're familiar with that. Things that derive directly from BaseException are generally intended to shut down the system while executing finally blocks and context manager __exit__ methods to release resources.
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