gym_super_mario_bros (7.3.0) - ValueError: not enough values to unpack (expected 5, got 4)

Question

I'm running Python3 (3.8.10) and am attempting a tutorial with the gym_super_mario_bros (7.3.0) and nes_py libraries. I followed various tutorials code and tried on multiple computers but get an error. I have tried to adjust some of the parameters like adding a 'truncated' variable to the list of values to return. As this is a tutorial level example I'm curious what is wrong. It looks like something with env.step(). Below is the code:

from nes_py.wrappers import JoypadSpace
from gym_super_mario_bros.actions import SIMPLE_MOVEMENT

env = gym_super_mario_bros.make('SuperMarioBros-v0')
env = JoypadSpace(env, SIMPLE_MOVEMENT)

done = True
for step in range(1000):
        if done:
                env.reset()
        state, reward, done, info = env.step(env.action_space.sample())
        env.render()
env.close()

The error I get is below:

/home/d/.local/lib/python3.8/site-packages/gym/envs/registration.py:555: UserWarning: WARN: The environment SuperMarioBros-v0 is out of date. You should consider upgrading to version `v3`.
  logger.warn(
/home/d/.local/lib/python3.8/site-packages/gym/utils/passive_env_checker.py:195: UserWarning: WARN: The result returned by `env.reset()` was not a tuple of the form `(obs, info)`, where `obs` is a observation and `info` is a dictionary containing additional information. Actual type: `<class 'numpy.ndarray'>`
  logger.warn(
/home/d/.local/lib/python3.8/site-packages/gym/utils/passive_env_checker.py:219: DeprecationWarning: WARN: Core environment is written in old step API which returns one bool instead of two. It is recommended to rewrite the environment with new step API.
  logger.deprecation(
Traceback (most recent call last):
  File "mario.py", line 12, in <module>
    state, reward, done, info = env.step(env.action_space.sample())
  File "/home/d/.local/lib/python3.8/site-packages/nes_py/wrappers/joypad_space.py", line 74, in step
    return self.env.step(self._action_map[action])
  File "/home/d/.local/lib/python3.8/site-packages/gym/wrappers/time_limit.py", line 50, in step
    observation, reward, terminated, truncated, info = self.env.step(action)
ValueError: not enough values to unpack (expected 5, got 4)

Any guidance is appreciated, thank you!

Answer 1

Move to "...../python3.8/site-packages/gym/wrappers/time_limit.py".And delete all "truncated"