code: def kill(self):
      # Kill all the new threads.
      for thread_id in list(threading._active):  # pylint: disable=W0212
          if thread_id in self._old_threads:
              continue
  
          res = ctypes.pythonapi.PyThreadState_SetAsyncExc(
              ctypes.c_long(thread_id), ctypes.py_object(SystemExit)
          )
          if res == 0:
              raise ValueError(f"Invalid thread id: {thread_id}")
          if res > 1:
              ctypes.pythonapi.PyThreadState_SetAsyncExc(
                  ctypes.c_long(thread_id), None
              )
              raise SystemExit("Stopping thread failure")
  
imports: import sys
  import os
  import time
  import uuid
  import shlex
  import threading
  import shutil
  import subprocess
  import logging
  import inspect
  import ctypes
  import runpy
  import requests
  import psutil
  import multiprocess
  from dash.testing.errors import NoAppFoundError, TestingTimeoutError, ServerCloseError, DashAppLoadingError
  from dash.testing import wait
label_desc: Use image node_id 2 for calling the KillerThread obj's underlying member method code with example usage: obj.kill() without return types