我突然很难在 Google Colab 中安装gym。
错误看起来像这样：
Looking in indexes: https://pypi.org/simple, https://us-python.pkg.dev/colab-wheels/public/simple/
Collecting gym[accept-rom-license,atari]==0.21.0
Using cached gym-0.21.0.tar.gz (1.5 MB)
error: subprocess-exited-with-error
× python setup.py egg_info did not run successfully.
│ exit code: 1
╰─> See above for output.
note: This error originates from a subprocess, and is likely not a problem with pip.
Preparing metadata (setup.py) ... error
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.
我已经升级了 pip 和 setuptools，并安装了 ez_setup，但没有任何效果。
TL;DR降级您的setuptools==65.5.0 and wheel<0.40.0
!pip install setuptools==65.5.0 "wheel<0.40.0"
Details:
这里的问题似乎与wheel(0.40.0+) 和setuptools(66.0.0+) 现在报告版本字符串gym==0.21.0的安装文件不再有效。以下回溯来自 Gym 的构建轮，如报告中所述Github #3202 健身房 https://github.com/openai/gym/issues/3202
...
wheel.vendored.packaging.requirements.InvalidRequirement: Expected end or semicolon (after version specifier)
opencv-python>=3.
这是指opencv-python>=3.中的字符串setup.py https://github.com/openai/gym/blob/v0.21.0/setup.py#L20。看来较新版本的wheel在这里引发错误。
您可以在其中找到一种解决方法Github 问题 #3211 https://github.com/openai/gym/issues/3211就是降级setuptools和wheel的版本，如下：
!pip install setuptools==65.5.0 "wheel<0.40.0"
重新启动内核后，您应该能够运行：
!pip install gym==0.21.0
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