new_contents: 
  from concurrent.futures import ThreadPoolExecutor
  executor = ThreadPoolExecutor(max_workers=2)
  
  
  def sleep_fun():
      import time
      print 'sleep start'
      time.sleep(5)
      print 'sleep end'
  
  def no_sleep():
      print 'no sleep'
  
  
  if __name__ == '__main__':
      executor.submit(sleep_fun)
      no_sleep()
  
subject: fix tornado lab