code: def set(self):
      self._cond.acquire()
      try:
          self._flag.acquire(False)
          self._flag.release()
          self._cond.notify_all()
      finally:
          self._cond.release()
  
imports: import threading
  import os
  import sys
  from time import time, sleep
  import _multiprocessing
  from multiprocessing.process import current_process
  from multiprocessing.util import Finalize, register_after_fork, debug
  from multiprocessing.forking import assert_spawning, Popen
label_desc: Use image node_id 3 for calling the Event obj's underlying member method code with example usage: obj.set() without return types