gym package not identifying ten-armed-bandits-v0 env - reinforcement-learning

Question

Environment:
Python: 3.9
OS: Windows 10
When I try to create the ten armed bandits environment using the following code the error is thrown not sure of the reason.
import gym
import gym_armed_bandits
env = gym.make('ten-armed-bandits-v0')
The error:
---------------------------------------------------------------------------
KeyError Traceback (most recent call last)
File D:\00_PythonEnvironments\01_RL\lib\site-packages\gym\envs\registration.py:158, in EnvRegistry.spec(self, path)
157 try:
--> 158 return self.env_specs[id]
159 except KeyError:
160 # Parse the env name and check to see if it matches the non-version
161 # part of a valid env (could also check the exact number here)
KeyError: 'ten-armed-bandits-v0'
During handling of the above exception, another exception occurred:
UnregisteredEnv Traceback (most recent call last)
Input In [6], in <module>
----> 1 env = gym.make('ten-armed-bandits-v0')
File D:\00_PythonEnvironments\01_RL\lib\site-packages\gym\envs\registration.py:235, in make(id, **kwargs)
234 def make(id, **kwargs):
--> 235 return registry.make(id, **kwargs)
File D:\00_PythonEnvironments\01_RL\lib\site-packages\gym\envs\registration.py:128, in EnvRegistry.make(self, path, **kwargs)
126 else:
127 logger.info("Making new env: %s", path)
--> 128 spec = self.spec(path)
129 env = spec.make(**kwargs)
130 return env
File D:\00_PythonEnvironments\01_RL\lib\site-packages\gym\envs\registration.py:203, in EnvRegistry.spec(self, path)
197 raise error.UnregisteredEnv(
198 "Toytext environment {} has been moved out of Gym. Install it via `pip install gym-legacy-toytext` and add `import gym_toytext` before using it.".format(
199 id
200 )
201 )
202 else:
--> 203 raise error.UnregisteredEnv("No registered env with id: {}".format(id))
UnregisteredEnv: No registered env with id: ten-armed-bandits-v0
When I check the environments available, I am able to see it there.
from gym import envs
print(envs.registry.all())
dict_values([EnvSpec(CartPole-v0), EnvSpec(CartPole-v1), EnvSpec(MountainCar-v0), EnvSpec(MountainCarContinuous-v0), EnvSpec(Pendulum-v1), EnvSpec(Acrobot-v1), EnvSpec(LunarLander-v2), EnvSpec(LunarLanderContinuous-v2), EnvSpec(BipedalWalker-v3), EnvSpec(BipedalWalkerHardcore-v3), EnvSpec(CarRacing-v0), EnvSpec(Blackjack-v1), EnvSpec(FrozenLake-v1), EnvSpec(FrozenLake8x8-v1), EnvSpec(CliffWalking-v0), EnvSpec(Taxi-v3), EnvSpec(Reacher-v2), EnvSpec(Pusher-v2), EnvSpec(Thrower-v2), EnvSpec(Striker-v2), EnvSpec(InvertedPendulum-v2), EnvSpec(InvertedDoublePendulum-v2), EnvSpec(HalfCheetah-v2), EnvSpec(HalfCheetah-v3), EnvSpec(Hopper-v2), EnvSpec(Hopper-v3), EnvSpec(Swimmer-v2), EnvSpec(Swimmer-v3), EnvSpec(Walker2d-v2), EnvSpec(Walker2d-v3), EnvSpec(Ant-v2), EnvSpec(Ant-v3), EnvSpec(Humanoid-v2), EnvSpec(Humanoid-v3), EnvSpec(HumanoidStandup-v2), EnvSpec(FetchSlide-v1), EnvSpec(FetchPickAndPlace-v1), EnvSpec(FetchReach-v1), EnvSpec(FetchPush-v1), EnvSpec(HandReach-v0), EnvSpec(HandManipulateBlockRotateZ-v0), EnvSpec(HandManipulateBlockRotateZTouchSensors-v0), EnvSpec(HandManipulateBlockRotateZTouchSensors-v1), EnvSpec(HandManipulateBlockRotateParallel-v0), EnvSpec(HandManipulateBlockRotateParallelTouchSensors-v0), EnvSpec(HandManipulateBlockRotateParallelTouchSensors-v1), EnvSpec(HandManipulateBlockRotateXYZ-v0), EnvSpec(HandManipulateBlockRotateXYZTouchSensors-v0), EnvSpec(HandManipulateBlockRotateXYZTouchSensors-v1), EnvSpec(HandManipulateBlockFull-v0), EnvSpec(HandManipulateBlock-v0), EnvSpec(HandManipulateBlockTouchSensors-v0), EnvSpec(HandManipulateBlockTouchSensors-v1), EnvSpec(HandManipulateEggRotate-v0), EnvSpec(HandManipulateEggRotateTouchSensors-v0), EnvSpec(HandManipulateEggRotateTouchSensors-v1), EnvSpec(HandManipulateEggFull-v0), EnvSpec(HandManipulateEgg-v0), EnvSpec(HandManipulateEggTouchSensors-v0), EnvSpec(HandManipulateEggTouchSensors-v1), EnvSpec(HandManipulatePenRotate-v0), EnvSpec(HandManipulatePenRotateTouchSensors-v0), EnvSpec(HandManipulatePenRotateTouchSensors-v1), EnvSpec(HandManipulatePenFull-v0), EnvSpec(HandManipulatePen-v0), EnvSpec(HandManipulatePenTouchSensors-v0), EnvSpec(HandManipulatePenTouchSensors-v1), EnvSpec(FetchSlideDense-v1), EnvSpec(FetchPickAndPlaceDense-v1), EnvSpec(FetchReachDense-v1), EnvSpec(FetchPushDense-v1), EnvSpec(HandReachDense-v0), EnvSpec(HandManipulateBlockRotateZDense-v0), EnvSpec(HandManipulateBlockRotateZTouchSensorsDense-v0), EnvSpec(HandManipulateBlockRotateZTouchSensorsDense-v1), EnvSpec(HandManipulateBlockRotateParallelDense-v0), EnvSpec(HandManipulateBlockRotateParallelTouchSensorsDense-v0), EnvSpec(HandManipulateBlockRotateParallelTouchSensorsDense-v1), EnvSpec(HandManipulateBlockRotateXYZDense-v0), EnvSpec(HandManipulateBlockRotateXYZTouchSensorsDense-v0), EnvSpec(HandManipulateBlockRotateXYZTouchSensorsDense-v1), EnvSpec(HandManipulateBlockFullDense-v0), EnvSpec(HandManipulateBlockDense-v0), EnvSpec(HandManipulateBlockTouchSensorsDense-v0), EnvSpec(HandManipulateBlockTouchSensorsDense-v1), EnvSpec(HandManipulateEggRotateDense-v0), EnvSpec(HandManipulateEggRotateTouchSensorsDense-v0), EnvSpec(HandManipulateEggRotateTouchSensorsDense-v1), EnvSpec(HandManipulateEggFullDense-v0), EnvSpec(HandManipulateEggDense-v0), EnvSpec(HandManipulateEggTouchSensorsDense-v0), EnvSpec(HandManipulateEggTouchSensorsDense-v1), EnvSpec(HandManipulatePenRotateDense-v0), EnvSpec(HandManipulatePenRotateTouchSensorsDense-v0), EnvSpec(HandManipulatePenRotateTouchSensorsDense-v1), EnvSpec(HandManipulatePenFullDense-v0), EnvSpec(HandManipulatePenDense-v0), EnvSpec(HandManipulatePenTouchSensorsDense-v0), EnvSpec(HandManipulatePenTouchSensorsDense-v1), EnvSpec(CubeCrash-v0), EnvSpec(CubeCrashSparse-v0), EnvSpec(CubeCrashScreenBecomesBlack-v0), EnvSpec(MemorizeDigits-v0), EnvSpec(three-armed-bandits-v0), EnvSpec(five-armed-bandits-v0), EnvSpec(ten-armed-bandits-v0), EnvSpec(MultiarmedBandits-v0)])

Answer 1

It could be a problem with your Python version: k-armed-bandits library was made 4 years ago, when Python 3.9 didn't exist. Besides this, the configuration files in the repo indicates that the Python version is 2.7 (not 3.9).
If you create an environment with Python 2.7 and follow the setup instructions it works correctly on Windows:
git clone gym_armed_bandits
cd gym_armed_bandits
pip install -e .