Python os.system 没有输出

2022-01-18 00:00:00 python subprocess os.system

问题描述

我正在运行这个:

os.system("/etc/init.d/apache2 restart")

它应该重新启动网络服务器，就像我直接从终端运行命令一样，它会输出:

It restarts the webserver, as it should, and like it would if I had run the command directly from the terminal, it outputs this:

* 正在重启 web 服务器 apache2 ...等待[OK]

但是，我不希望它在我的应用程序中实际输出.我怎样才能禁用它?谢谢！

However, I don't want it to actually output it in my app. How can I disable it? Thanks!

解决方案

尽量避免os.system()，改用子进程:

Avoid os.system() by all means, and use subprocess instead:

with open(os.devnull, 'wb') as devnull:
    subprocess.check_call(['/etc/init.d/apache2', 'restart'], stdout=devnull, stderr=subprocess.STDOUT)

这是 /etc/init.d/apache2 restart &> 的 subprocess 等效项./dev/null.

This is the subprocess equivalent of the /etc/init.d/apache2 restart &> /dev/null.

Python 上有 subprocess.DEVNULL3.3+:

There is subprocess.DEVNULL on Python 3.3+:

#!/usr/bin/env python3
from subprocess import DEVNULL, STDOUT, check_call

check_call(['/etc/init.d/apache2', 'restart'], stdout=DEVNULL, stderr=STDOUT)

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