How do you list all child processes in python?

问题:

I'm using a third party library that starts various sub processes. When there's an exception I'd like to kill all the child processes. How can I get a list of child pids?

回答1:

You can't always log all the sub-processes as they are created, since they can in turn create new processes that you are not aware of. However, it's pretty simple to use psutil to find them:

import psutil

current_process = psutil.Process()
children = current_process.children(recursive=True)
for child in children:
    print('Child pid is {}'.format(child.pid))

回答2:

It's usually safer to log the pids of all your child processes when you create them. There isn't a posix compliant way to list child PIDs. I know this can be done with the PS tool.

回答3:

Using psutil you can get all children process (even recursive process) look at https://psutil.readthedocs.io/en/latest/#psutil.Process.children