重磅推荐【Pettingzoo】类似gym的多Agent强化学习的环境（61类环境），史上最全！

# Using environments in PettingZoo is very similar to Gym, i.e. you initialize an environment via:

from pettingzoo.butterfly import pistonball_v4
env = pistonball_v4.env()
# Environments can be interacted with in a manner very similar to Gym:

env.reset()
for agent in env.agent_iter():
    observation, reward, done, info = env.last()
    action = policy(observation)
    env.step(action)