在程序退出前做某事 [英] Doing something before program exit

问题描述

你怎么能有一个函数或一些东西在你的程序退出之前会被执行?我有一个脚本将在后台不断运行，我需要它在退出之前将一些数据保存到文件中.有没有标准的方法来做到这一点?

How can you have a function or something that will be executed before your program quits? I have a script that will be constantly running in the background, and I need it to save some data to a file before it exits. Is there a standard way of doing this?

推荐答案

查看 atexit 模块:

http://docs.python.org/library/atexit.html

例如，如果我想在我的应用程序终止时打印一条消息:

For example, if I wanted to print a message when my application was terminating:

import atexit

def exit_handler():
    print 'My application is ending!'

atexit.register(exit_handler)

请注意，这对于脚本的正常终止非常有用，但不会在所有情况下都被调用(例如致命的内部错误).

Just be aware that this works great for normal termination of the script, but it won't get called in all cases (e.g. fatal internal errors).

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