docstr: Support squared bracket syntax, e.g. buffer[:5].
docstr_tok: ["Support","squared","bracket","syntax",",","e.g",".","buffer","[",":5","]","."]
code: def __getitem__(self, item):
      """Support squared bracket syntax, e.g. buffer[:5]."""
      return self.get(item)
  
imports: import logging
  from typing import List, Optional, Type, Union
  import gymnasium
  import numpy
  import tree
  from ray.rllib.env.env_context import EnvContext
  from ray.rllib.env.multi_agent_env import MultiAgentEnv
  from ray.rllib.env.wrappers.multi_agent_env_compatibility import MultiAgentEnvCompatibility
  from ray.rllib.utils.error import ERR_MSG_INVALID_ENV_DESCRIPTOR, ERR_MSG_OLD_GYM_API, EnvError
  from ray.rllib.utils.gym import check_old_gym_env
  from ray.rllib.utils.numpy import one_hot, one_hot_multidiscrete
  from ray.rllib.utils.spaces.space_utils import batch, get_dummy_batch_for_space, get_base_struct_from_space
  from ray.util import log_once
  from ray.util.annotations import PublicAPI
label_desc: Use image node_id 8 for calling the BufferWithInfiniteLookback obj's underlying member method code with example usage: obj.__getitem__(item) and returns: self