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Tips for executing code before a program exits

Using the built-in module atexit, you can easily register the exit function.

No matter where you cause the program to crash, the functions you have registered will be executed.

Examples are as follows

If the clean () function has arguments, you can call atexit.register (clean_1, argument 1, argument 2, argument 3, arguments xxxx') without a decorator.

You may have other ways to deal with this requirement, but it is certainly more elegant and convenient than not using atexit, and it is easy to extend.

But there are still some limitations to using atexit, such as:

If the program is killed by a system signal that you have not processed, the registered function will not execute properly.

If a serious Python internal error occurs, the function you registered will not execute properly.

If you call os._exit () manually, the function you registered will not execute properly.

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