这里需要注意的是，`nohup`只是在主进程正常退出情况下禁止`SIGHUP`信号，如果信号是`SIGINT`或`SIGTERM ...

I want to use nohup to run a Python file in the background, such as nohup python test.py >nohup.out 2>&1 &, but the program does not end and has been waiting, code like this: ssh_client= await ...