Gymnasium/tests/wrappers/utils.py

from __future__ import annotations

import gymnasium as gym


def has_wrapper(wrapped_env: gym.Env, wrapper_type: type[gym.Wrapper]) -> bool:
    while isinstance(wrapped_env, gym.Wrapper):
        if isinstance(wrapped_env, wrapper_type):
            return True
        wrapped_env = wrapped_env.env
    return False