code: def register_actor(name, actor_handle):
      
      if not isinstance(name, str):
          raise TypeError("The name argument must be a string.")
      if not isinstance(actor_handle, ray.actor.ActorHandle):
          raise TypeError("The actor_handle argument must be an ActorHandle "
                          "object.")
      actor_name = _calculate_key(name)
      pickled_state = pickle.dumps(actor_handle)
  
      # Add the actor to Redis if it does not already exist.
      already_exists = _internal_kv_put(actor_name, pickled_state)
      if already_exists:
          # If the registration fails, then erase the new actor handle that
          # was added when pickling the actor handle.
          actor_handle._ray_new_actor_handles.pop()
          raise ValueError(
              "Error: the actor with name={} already exists".format(name))
docs: Register a named actor under a string key.
  
     Args:
         name: The name of the named actor.
         actor_handle: The actor object to be associated with this name