出现：Microsoft Visual C++ 14.0 is required 的解决方案

以安装pandas为例：
如：pip install scrapy 时出现：
error: Microsoft Visual C++ 14.0 is required. Get it with “Microsoft Visual C++ Build Tools”: http://landinghub.visualstudio.com/visual-cpp-build-tools

解决办法

1. 安装 Microsoft visual c++ 14.0
   https://964279924.ctfile.com/fs/1445568-239446865
   或
   https://pan.baidu.com/s/1q2Nj41Xk85CHHv7_zOhQIA 密码：qbba