Kill process with python on linux

import os
import signal

def kill_process(processname):
    for line in os.popen("ps xa"):
        fields = line.split()
        pid = fields[0]
        process = fields[4]
        print process
        if process == processname:
            os.kill(int(pid), signal.SIGKILL)
            break
        else:
            pass

look here for a windows solution or google it