python=3.8安装gym==0.21报错解决

 wheel.vendored.packaging._tokenizer.ParserSyntaxError: Expected end or semicolon (after version specifier)           opencv-python>=3.

解决方案   测试有效

pip install --upgrade pip wheel==0.38.4

 另外，还有在一种报错，如下

 

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.

解决方法

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

测试有效