如何在 Python 中启动后台进程? [英] How to start a background process in Python?

问题描述

我正在尝试将 shell 脚本移植到更具可读性的 Python 版本.原始 shell 脚本在后台使用&"启动多个进程(实用程序、监视器等).我怎样才能在python中达到同样的效果?当 python 脚本完成时，我希望这些进程不会死.我确信它以某种方式与守护进程的概念有关，但我找不到如何轻松做到这一点.

I'm trying to port a shell script to the much more readable python version. The original shell script starts several processes (utilities, monitors, etc.) in the background with "&". How can I achieve the same effect in python? I'd like these processes not to die when the python scripts complete. I am sure it's related to the concept of a daemon somehow, but I couldn't find how to do this easily.

推荐答案

注意:与 2009 年发布时相比，此答案的更新程度较低.使用 subprocess 模块现在推荐在其他答案中显示在文档中

Note: This answer is less current than it was when posted in 2009. Using the subprocess module shown in other answers is now recommended in the docs

(请注意，subprocess 模块为生成新进程和检索其结果提供了更强大的工具；使用该模块比使用这些函数更可取.)

(Note that the subprocess module provides more powerful facilities for spawning new processes and retrieving their results; using that module is preferable to using these functions.)

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如果您希望您的进程在后台启动，您可以使用 system() 并以与您的 shell 脚本相同的方式调用它，或者您可以 spawn它:

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If you want your process to start in the background you can either use system() and call it in the same way your shell script did, or you can spawn it:

import os
os.spawnl(os.P_DETACH, 'some_long_running_command')

(或者，您可以尝试使用不太便携的 os.P_NOWAIT 标志).

(or, alternatively, you may try the less portable os.P_NOWAIT flag).

请参阅此处的文档.

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