解决方案：
安装visual studio 2017，选择支持Python，
安装完成后配置路径：
Add this to your PATH environment variables:
C:\Program Files (x86)\Windows Kits\8.0\bin\x86
Copy these files:
rc.exe rcdll.dll
From
C:\Program Files (x86)\Windows Kits\10\bin\10.0.16299.0\x64
To
C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\bin
再进行pip install POT即可
python 安装最优传输模块POT出现问题：Microsoft Visual C++ 14.0 is required (Unable to find vcvarsall.bat)
原文：https://www.cnblogs.com/XiangGu/p/8973484.html