Rendering fails in multiple ways on Pong-v4

[ikamensh]

1. Missing dependency pygame?

   pip install gym[atari]
   python -c "import gym; env=gym.make('Pong-v4'); env.render()"

   -> fails to import pygame

---

2. no rendering in gym.envs.classic_control

   pip install gym[atari]
   pip install pygame
   python -c "import gym; env=gym.make('Pong-v4'); env.render()"

   ->

   File "/Users/kai7rng/opt/anaconda3/envs/matari/lib/python3.8/site-packages/gym/envs/atari/environment.py", line 264, in render
   from gym.envs.classic_control import rendering
   ImportError: cannot import name 'rendering' from 'gym.envs.classic_control' (/Users/kai7rng/opt/anaconda3/envs/matari/lib/python3.8/site-packages/gym/envs/classic_control/__init__.py)

Environment: MacOs with Python 3.8.5, gym dependencies:

ale-py==0.7.4
AutoROM==0.4.2
AutoROM.accept-rom-license==0.4.2
gym==0.23.1
gym-notices==0.0.6

[pseudo-rnd-thoughts]

Im able to replicate your issue with pip install gym[atari] but pip install pygame seems to fix it for me

[JesseFarebro]

Yes, env.render() is broken in the current release of Gym. I'll be releasing another update to fix this on our side.

It's worth noting that we do not recommend you use env.render(). Please supply the render_mode kwarg to the constructor, e.g.,

env = gym.make('ALE/Breakout-v5', render_mode='human')

[JesseFarebro]

With ale-py==0.7.5 we removed .render(mode="human"). This will now display a warning and instruct users to use the render_mode keyword argument when constructing the environment.