When I call localtunnel in the main thread (blocking), it returns the desired output: In : popen = subprocess.Popen() The code above works properly with output similar to this: Main thread. Popen = subprocess.Popen(args, shell=False, stdout=subprocess.PIPE) A 'sanity check': import subprocess, threading, time Maybe I am doing something wrong…įirst of all. Unfortunately, both answers do not work for me. I know I do not need root privileges to execute this.ĮDIT after answers from jadkik94 and fest I've read a lot the documentation of subprocess module, in particular, subprocess.Popen.īeing pratical: why this code does not work with argument? It outputs nothing… Still, I cannot figure out how to accomplish this. But it is essential that it unlocks after that line so I can perform other tasks completely unrelated with the background program. There is no problem if this program blocks my code until reach this line. The info from the background program that I need is located, precisely, in the second line of its output. But the background program must keep executing. I need to execute some program in background, wait for output and manipulate it.

I already know there is several questions targeting this theme, but none of them solved my specific problem.

Python subprocess run in the background