code: def spawnSignallingThread(self):
      thread.start_new_thread(send_signals, ())
  
imports: import unittest
  import signal
  import os
  import sys
  from test.support import threading_helper
  import _thread
  import time
label_desc: Use image node_id 2 for calling the ThreadSignals obj's underlying member method code with example usage: obj.spawnSignallingThread() without return types