docstr: Adds another buffer or list to the end of this one.
  
  Args:
      other: Either `BufferWithInfiniteLookback` or `list`.
          If a `BufferWithInfiniteLookback` the data gets
          concatenated. If a `list` the list is concatenated to the
          `self.data`.
  
  Returns:
      A new `BufferWithInfiniteLookback` instance `self.data` cotnaining
      concatenated data from `self.` and `other`.
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code: def __add__(self, other):
      """Adds another buffer or list to the end of this one.
  
      Args:
          other: Either `BufferWithInfiniteLookback` or `list`.
              If a `BufferWithInfiniteLookback` the data gets
              concatenated. If a `list` the list is concatenated to the
              `self.data`.
  
      Returns:
          A new `BufferWithInfiniteLookback` instance `self.data` cotnaining
          concatenated data from `self.` and `other`.
      """
  
      if self.finalized:
          raise RuntimeError(
              f"Cannot `add` to a finalized {type(self).__name__}."
          )
      else:
          if isinstance(other, BufferWithInfiniteLookback):
              data = self.data + other.data
          else:
              data = self.data + other
          return BufferWithInfiniteLookback(
              data=data,
              lookback=self.lookback,
              space=self.space,
          )
  
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 7 for calling the BufferWithInfiniteLookback obj's underlying member method code with example usage: obj.__add__(other) and returns: BufferWithInfiniteLookback