强化学习问题（六）--- 无法安装gym 0.21.0

 1.问题

       新版gym0.26.2，无法执行以下代码

from gym.envs.toy_text import discrete

   故将gym0.26.2改成gym0.21.0，但遇到以下错误

Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error
 
  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [1 lines of output]
      error in gym setup command: 'extras_require' must be a dictionary whose values are strings or lists of strings containing valid project/version requirement specifiers.
      [end of output]
 
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed
 
× Encountered error while generating package metadata.
╰─> See above for output.
 
note: This is an issue with the package mentioned above, not pip.
hint: See above for details.

2.解决

    分别改变setuptools和 wheel版本即可。

pip install setuptools==65.5.0
 
pip install --user wheel==0.38.0

参考文献

1.如何正确安装gym==0.21.0_YC_lemon的博客-CSDN博客