Change seeding error message to report seed type

[theo-brown]

Description

Changed error message produced when seed argument of env.reset(seed=seed) is the incorrect type to include the type of the incorrect seed rather than the value. This is in line with most other Python error messages.

Fixes #3127

Type of change

Bug fix (non-breaking change which fixes an issue)

Example

import numpy as np
import gym

rng = np.random.default_rng()
seed = rng.integers(2**32)

env = gym.make("MountainCarContinuous-v0")
env.reset(seed=seed)

Before	After
gym.error.Error: Seed must be a non-negative integer or omitted, not 1407292551	gym.error.Error: Seed must be a non-negative integer or omitted, not <class 'numpy.int64'>

Checklist:

• I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

I have not followed the above checklist because I changed so little. Any problems with this PR exist externally in the openai/gym repo.

[balisujohn]

Thanks for your contribution! One small nitpick: I think it would be good to print both the type and the value. For reference, right now if I'm reading it right if I gave the reset function seed = int(-1), I'd get the message

gym.error.Error: Seed must be a non-negative integer or omitted, not <class 'int'>

So maybe something like:

gym.error.Error: Seed must be a non-negative integer or omitted: current type: <class 'int'>, current value: -1

It seems like we already have adequate testing coverage for this function in https://github.com/openai/gy/blob/master/tests/utils/test_seeding.py , so I don't think there is a super strong need to add a test.

[theo-brown]

I was following the example TypeError from the Python docs, which doesn't print the value:

>>> '2' + 2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: can only concatenate str (not "int") to str

[balisujohn]

LGTM :^)

[pseudo-rnd-thoughts]

Hey, we just launched gymnasium, a fork of Gym by the maintainers of Gym for the past 18 months where all maintenance and improvements will happen moving forward. Could you please move this over to the new repo?

If you'd like to read more about the story behind the backstory behind this and our plans going forward, click here.