许多软件包没有为 Python 3.9 预先构建***，因为它是新的.

Many packages do not have pre-built wheels for Python 3.9 as it is new.

还有 pygame-1.9.6-cp27-cp27m-win_amd64.whl 适用于 Python 2.7

Also pygame-1.9.6-cp27-cp27m-win_amd64.whl is for Python 2.7

***的办法是恢复到 Python 3.8.6 以使用 pip 安装预构建的***

Your best bet is to revert to Python 3.8.6 to install pre-built wheel with pip