python - subprocess.Popen().pid 返回父脚本的pid
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python - subprocess.Popen().pid return the pid of the parent script
提问by farhawa
I am trying to run a Python script from another Python script, and getting its pidso I can kill it later.
我正在尝试从另一个 Python 脚本运行一个 Python 脚本，并获取它pid以便我以后可以杀死它。
I tried subprocess.Popen()with argument shell=True', but thepidattribute returns thepid` of the parent script, so when I try to kill the subprocess, it kills the parent.
我尝试subprocess.Popen()使用父脚本的参数shell=True', but thepid attribute returns thepid`，因此当我尝试终止子进程时，它会终止父进程。
Here is my code:
这是我的代码：
proc = subprocess.Popen(" python ./script.py", shell=True)
pid_ = proc.pid
.
.
.
# later in my code
os.system('kill -9 %s'%pid_)
#IT KILLS THE PARENT :(
回答by icktoofay
So run it directly without a shell:
所以不用shell直接运行：
proc = subprocess.Popen(['python', './script.py'])
By the way, you may want to consider changing the hardcoded 'python'to sys.executable. Also, you can use proc.kill()to kill the process rather than extracting the PID and using that; furthermore, even if you did need to kill by PID, you could use os.killto kill the process rather than spawning another command.
顺便说一句，您可能需要考虑将硬编码更改'python'为sys.executable. 此外，您可以使用proc.kill()来终止进程，而不是提取 PID 并使用它；此外，即使您确实需要通过 PID 终止，您也可以使用os.kill终止进程而不是生成另一个命令。
回答by jfs
shell=Truestarts a new shell process. proc.pidis the pid of that shell process. kill -9kills the shell process making the grandchild python process into an orphan.
shell=True启动一个新的 shell 进程。proc.pid是那个shell进程的pid。kill -9杀死 shell 进程，使孙子 python 进程成为孤儿。
If the grandchild python script can spawn its own child processes and you want to kill the whole process tree then see How to terminate a python subprocess launched with shell=True:
如果孙子 python 脚本可以产生自己的子进程，并且您想终止整个进程树，那么请参阅如何终止使用 shell=True 启动的 python 子进程：
#!/usr/bin/env python
import os
import signal
import subprocess
proc = subprocess.Popen("python script.py", shell=True, preexec_fn=os.setsid)
# ...
os.killpg(proc.pid, signal.SIGTERM)
If script.pydoes not spawn any processes then use @icktoofay suggestion: drop shell=True, use a list argument, and call proc.terminate()or proc.kill()-- the latter always works eventually:
如果script.py没有产生任何进程，则使用@icktoofay 建议： drop shell=True，使用列表参数，然后调用proc.terminate()or proc.kill()-- 后者最终总是有效：
#!/usr/bin/env python
import subprocess
proc = subprocess.Popen(["python", "script.py"])
# ...
proc.terminate()
If you want to run your parent script from a different directory; you might need get_script_dir()function.
如果你想从不同的目录运行你的父脚本；你可能需要get_script_dir()function。
Consider importing the python module and running its functions, using its object (perhaps via multiprocessing) instead of running it as a script. Here's code example that demonstrates get_script_dir()and multiprocessingusage.
考虑导入 python 模块并运行其函数，使用其对象（可能通过multiprocessing）而不是将其作为脚本运行。这是演示get_script_dir()和multiprocessing用法的代码示例。
