python - 守护线程在 Python 3.5.1 中有何用处？

Question

在浏览线程对象的 python 文档时，它有一个关于守护线程的注释，其中写道:

Daemon threads are abruptly stopped at shutdown. Their resources (such as open files, database transactions, etc.) may not be released properly. If you want your threads to stop gracefully, make them non-daemonic and use a suitable signalling mechanism such as an Event.

那么我们为什么要使用它们？

Answer 1

Python 尝试在退出时加入非守护线程。如果你没有实现终止它们的机制，python 将挂起。令人烦恼的是，ctrl-C 通常不起作用，您必须从外部终止该程序。