Python kill all processes owned by user

I need to make a function that can kill all processes owned by user and later to start few.

My main problem is that I cannot figure how to check if all processes were killed, and if开发者_Python百科 there are still running processes, to retry for 1-2 times to kill them, and then return error. I want to use only python code.

Here is my code:

import os
import pwd


def pkill(user):
    pids = []
    user_pids = []
    uid = pwd.getpwnam(user).pw_uid
# get all PID 
    for i in os.listdir('/proc'):
        if i.isdigit():
            pids.append(i)
# test if PID is owned by user
    for i in pids:
        puid = os.stat(os.path.join('/proc', i)).st_uid
        if puid == uid:
            user_pids.append(i)
# print len(user_pids)
# check of PID still exist and kill it
    for i in user_pids:
        if os.path.exists(os.path.join('/proc',i)):
            try:
                os.kill(int(i), 15)
            except OSError: 

Thank you

The default way to check if a process is running, in Linux (it's POSIX compatible also), is to use kill -0 PID, so here you can simply do an os.kill but with 0 as a signal, if the process is dead it should throw an exception, if it's alive it should not.

can't you do the same thing you did to find the processes? that function should return 0..