Microsoft Visual C++ 14.0 is required
Solution:
Method 1:
Install the third-party library corresponding to your own windows version and python version.
Go to this website http://www.lfd.uci.edu/~gohlke/pythonlibs to find the package you need to install the library corresponding to the system. After downloading, use pip to install it.
Method 2:
Install Microsoft's Microsoft Visual C++ Build Tools ,
Many articles mention this address of Microsoft,
http://landinghub.visualstudio.com/visual-cpp-build-tools
But here I can't find a place to download, I found
a download link on other websites, install Later you can use
http://www.xdowns.com/soft/38/138/2017/Soft_226169.html