import threading
import subprocess
import os
import sys

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', self.filename, '&'], stdout=FNULL, stderr=FNULL, shell=True)
        cmd.communicate()
        cmd.kill()



script_thread = subprocess_thread('test.py')
script_thread.start()