python2安装Python包，报错 Microsoft Visual C++ 9.0 is required. Get it from http://aka.ms/vcpython27

python2安装Python包，报错 Microsoft Visual C++ 9.0 is required. Get it from http://aka.ms/vcpython27

下载这个msi文件，然后安装：
https://web.archive.org/web/20210106040224/https://download.microsoft.com/download/7/9/6/796EF2E4-801B-4FC4-AB28-B59FBF6D907B/VCForPython27.msi
然后再继续pip安装想要安装的包即可。