code: def test_play_loop_real_env():
      SEED = 42
      ENV = "CartPole-v1"
  
      # If apply_wrapper is true, we provide keys_to_action through the environment. If str_keys is true, the
      # keys_to_action dictionary will have strings as keys
      for apply_wrapper, str_keys in product(
          [False, True], [False, True]
      ):
          # set of key events to inject into the play loop as callback
          callback_events = [
              Event(KEYDOWN, {"key": RELEVANT_KEY_1}),
              Event(KEYUP, {"key": RELEVANT_KEY_1}),
              Event(KEYDOWN, {"key": RELEVANT_KEY_2}),
              Event(KEYUP, {"key": RELEVANT_KEY_2}),
              Event(KEYDOWN, {"key": RELEVANT_KEY_1}),
              Event(KEYUP, {"key": RELEVANT_KEY_1}),
              Event(KEYDOWN, {"key": RELEVANT_KEY_1}),
              Event(KEYUP, {"key": RELEVANT_KEY_1}),
              Event(KEYDOWN, {"key": RELEVANT_KEY_2}),
              Event(KEYUP, {"key": RELEVANT_KEY_2}),
              Event(QUIT),
          ]
          keydown_events = [
              k for k in callback_events if k.type == KEYDOWN
          ]
  
          def callback(
              obs_t, obs_tp1, action, rew, terminated, truncated, info
          ):
              pygame_event = callback_events.pop(0)
              event.post(pygame_event)
  
              # after releasing a key, post new events until
              # we have one keydown
              while pygame_event.type == KEYUP:
                  pygame_event = callback_events.pop(0)
                  event.post(pygame_event)
  
              return (
                  obs_t,
                  obs_tp1,
                  action,
                  rew,
                  terminated,
                  truncated,
                  info,
              )
  
          env = gym.make(
              ENV, render_mode="rgb_array", disable_env_checker=True
          )
          env.reset(seed=SEED)
          keys_to_action = (
              dummy_keys_to_action_str()
              if str_keys
              else dummy_keys_to_action()
          )
  
          # first action is 0 because at the first iteration
          # we can not inject a callback event into play()
          obs, _, _, _, _ = env.step(0)
          for e in keydown_events:
              action = keys_to_action[
                  chr(e.key) if str_keys else (e.key,)
              ]
              obs, _, _, _, _ = env.step(action)
  
          env_play = gym.make(
              ENV, render_mode="rgb_array", disable_env_checker=True
          )
          if apply_wrapper:
              env_play = KeysToActionWrapper(
                  env, keys_to_action=keys_to_action
              )
              assert hasattr(env_play, "get_keys_to_action")
  
          status = PlayStatus(callback)
          play(
              env_play,
              callback=status.callback,
              keys_to_action=None if apply_wrapper else keys_to_action,
              seed=SEED,
          )
  
          assert (status.last_observation == obs).all()
  
imports: from functools import partial
  from itertools import product
  from typing import Callable
  import numpy
  import pygame
  import pytest
  from pygame import KEYDOWN, KEYUP, QUIT, event
  from pygame.event import Event
  import gym
  from gym.utils.play import MissingKeysToAction, PlayableGame, play
  from tests.testing_env import GenericTestEnv
label_desc: Use image node_id 14 for calling a global function with example usage: test_play_loop_real_env() and returns: obs_t,  obs_tp1,  action,  rew,  terminated,  truncated,  info