old_contents: import threading
  
  def thread_job():
      print('This is an added Thread, number is %s' % threading.current_thread())
  
  def main():
      added_thread = threading.Thread(target=thread_job)
      added_thread.start()
  
  if __name__ == '__main__':
      main()
new_contents: import threading
  
  #def main():
  #    print(threading.active_count())
  #    print(threading.enumerate()) # see the thread list
  #    print(threading.current_thread())
  
  def thread_job():
      print('This is a thread of %s' % threading.current_thread())
  
  def main():
      thread = threading.Thread(target=thread_job,)
      thread.start()
  if __name__ == '__main__':
      main()
  
subject: create thread2