import os
import threading
import subprocess

class subprocess_thread(threading.Thread):

    def __init__(self, filename):
        threading.Thread.__init__(self)
        self.filename = filename

    def run(self):
        FNULL = open(os.devnull, 'w')
        cmd = subprocess.Popen(['python {0} &'.format(self.filename)], shell=True)
        cmd.communicate()
        try:
            cmd.kill()
        except OSError:
            pass


script_thread = subprocess_thread(os.path.join(os.path.dirname(os.path.abspath(__file__)), "test.py"))
script_thread.start()