运行openai的gym代码报错提示import pyglet，安装后依然报错：ImportError: sys.meta_path is None, Python is likely shutting down

运行代码：

import gym

def cartpole():
    environment = gym.make('CartPole-v1')
    environment.reset()
    for _ in range(1000):
        environment.render()
        action = environment.action_space.sample()
        observation, reward, done, info = environment.step(action)
        print("Step {}:".format(_))
        print("action: {}".format(action))
        print("observation: {}".format(observation))
        print("reward: {}".format(reward))
        print("done: {}".format(done))
        print("info: {}".format(info))

if __name__ == '__main__':

    cartpole()

报错，提示需要安装pyglet:

安装pyglet：

pip install pyglet

再次运行依然报错：

最后发现其原因在pyglet的版本问题：

卸载pyglet并重新安装即可解决：

pip uninstall pyglet

pip install pyglet==1.2.4

成功解决错误。