A certain card game named 7王523
1.downloading the card_env.py file to the classic_control/envs/gym/site_packages/python3.7/lib(under anaconda environment)
2.modify the init.py/classic_control, adding from gym.envs.classic_control.card_env import CardEnv
3.modyfy the init.py/envs, adding
register(
id='CardEnv-v0',
entry_point='gym.envs.classic_control:CardEnv',
)