I am calling a command using

subprocess.call(cmd, shell=True)

The command won't terminate automatically. How to kill it?

Since subprocess.call waits for the command to complete, you can't kill it programmatically. Your only recourse is to kill it manually via an OS specific command like kill.

If you want to kill a process programmatically, you'll need to start the process with subprocess.Popen and then terminate it. An example of this is below:

import time, subprocesst1 = time.time()p = subprocess.Popen('sleep 1', shell=True)
p.terminate()
p.wait()
t2 = time.time()print(t2 - t1)

This script takes about .002s to execute (rather than ~1s if the sleep command wasn't terminated).