How to execute the rest of the python script while launching and running the launch files in the background?

edit

Hi, I actually tried subprocess too, but it doesn't work. For example, if my code is:

import subprocess
subprocess.Popen(["roslaunch", "pkg", "file.launch",])
print("then this was printed")

Then my terminal will have output from the roslaunch, and program doesn't proceed further to execute the print statement till I terminate the roslaunch command.

What I require is the python code executes the roslaunch command and goes on to execute the print statement, regardless of whether the roslaunch command is still running or terminated.

HI, I think subprocess should work. Here's a piece of code I've used to do exactly that

command = "roslaunch {0} {1}".format(pkg, launchfile)
my_env = os.environ.copy()
p = subprocess.Popen(command, shell=True, env=my_env)

Hope that works for you.