code: def _pull(self, arm_ids):
      return random.choice(arm_ids)
  
file_path: river/river/bandit/test_policies.py
imports: from __future__ import annotations
  import copy
  import importlib
  import inspect
  import random
  import gym
  import pytest
  from river import bandit, metrics
  from .test_envs import _iter_envs
label_desc: Use image node_id 1 for calling the RandomPolicy obj's underlying member method code with example usage: obj._pull(arm_ids) and returns: random