How to terminate a python subprocess launched with shell=True

Answer

import os
import signal
import subprocess

# The os.setsid() is passed in the argument preexec_fn so
# it's run after the fork() and before  exec() to run the shell.
pro = subprocess.Popen(cmd, stdout=subprocess.PIPE,
                       shell=True, preexec_fn=os.setsid)

os.killpg(pro.pid, signal.SIGTERM)  # Send the signal to all the process groups