how to create and destroy non blocking sub process that are OS independent in python?

Question

In a python script i want to spawn a process that runs a file in the same directory
I dont want the python script to be blocked by the new process
Then want to be able to close the spawned process from the script.
Ontop of it all i need it to be OS independant.

What is the best of doing this?

ive had a bit of a play round, maybe not enough. always seem to run into the issue of the process being blocking or not correctly getting the pid — Calum
– Calum, Commented Jan 19, 2013 at 2:43
i cant recall all of what i tried off hand, as i was at another machine while trying it. mostly was playing round with the call and Popen methods — Calum
– Calum, Commented Jan 19, 2013 at 3:08

Generic Ratzlaugh · Accepted Answer · 2017-10-30 17:21:27Z

As @Keith suggested use subprocess module, but more specifically use Popen. For example, on Windows, this opens myfile.txt with notepad and then terminates it after a 20 seconds:

import subprocess import time command = "notepad myfile.txt" pipe = subprocess.Popen(command, shell=False) time.sleep(5) pipe.poll() print("%s" % pipe.returncode) #"None" when working fine time.sleep(5) pipe.terminate() pipe.wait() print("%s" % pipe.returncode) # 1 after termination

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