[Bug Report] Add return type to `close` in the class `Env`

[LinHungShi]

Describe the bug

The return type of close is not annotated, which causes

Call to untyped function "close" in typed context  [no-untyped-call]

if the caller function is typed.

Code example

Edit the file test.py and add the following code:


import gymnasium as gym

def func() -> None:
        env = gym.make('CartPole-v1')
        env.close()


After that, execute the command:


mypy test.py

System info

gym version: 1.1.0
OS: MacOS

Additional context

No response

Checklist

• I have checked that there is no similar issue in the repo

[pseudo-rnd-thoughts]

Thanks for the issue, we can certainly add that. @LinHungShi Would you be able to make a PR for this?

However, generally type safe of the project is not great and if you know where else we can improve, please share

[LinHungShi]

Hi thanks for the reply. I never create a PR for the public repo. What's the standard process to create a PR ?

[pseudo-rnd-thoughts]

See https://github.com/Farama-Foundation/Gymnasium/blob/main/CONTRIBUTING.md