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I think this is the ROS way to do it:

import roslaunch
uuid = roslaunch.rlutil.get_or_generate_uuid(options_runid=None, options_wait_for_master=False)
roslaunch.configure_logging(uuid)
launch = roslaunch.parent.ROSLaunchParent(uuid, roslaunch_files=[], is_core=True)
launch.start()
#  --- your code ---
launch.shutdown()

You can specify your launch files as a list of string in the ROSLaunchParent constructor. Check the doc if needed.