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) ... errorerror: 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==65.5.0pip 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