docs: def shutdown(self, wait=True):
      """
      Shut down the ThreadPool.
  
      # Arguments
      wait (bool): If #True, wait until all worker threads end. Note that pending
        jobs are still executed. If you want to cancel any pending jobs, use the
        #clear() or #cancel_all() methods.
      """
  
      if self.__running:
        # Add a Non-entry for every worker thread we have.
        for thread in self.__threads:
          assert thread.isAlive()
          self.__queue.append(None)
        self.__running = False
  
      if wait:
        self.__queue.wait()
        for thread in self.__threads:
          thread.join()