在程序退出前做些事情 [英] Doing something before program exit

问题描述

你怎么能有一个函数或者什么东西会在程序退出之前执行？我有一个将在后台不断运行的脚本，我需要它在退出之前将一些数据保存到文件中。有没有这样做的标准方法？

> module：

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

例如，如果我想在应用程序终止时打印消息：

  import atexit 
 
 def exit_handler（）：
 print'My application is ending！'
 
 atexit.register（exit_handler）
  

请注意，这对于正常终止该脚本，但它不会在所有情况下被调用（例如致命的内部错误）。

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?

解决方案

Check out the atexit module:

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

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)

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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