python - 无法在python中按名称获取进程的PID

Question

我有一段非常简单的代码

import subprocess
print(subprocess.check_output(["pidof","ffmpeg"]))

应该打印名为 ffmpeg 的进程的 PID(参见 here)。但是，我总是收到以下错误:

subprocess.CalledProcessError: Command '['pidof', 'ffmpeg']' returned non-zero exit status 1

对于 python2 和 python3。我做错了什么？

Answer 1

来自 man pidof:

EXIT STATUS
       0      At least one program was found with the requested name.

       1      No program was found with the requested name.

您只是没有任何名为 ffmpeg 的进程。