1、pip install pycrypto报错如下 error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\BIN\\x86_amd64\\cl.exe' failed with exit code 2

2、搞了半天，又是下载安装 Microsoft Visual Studio 14.0 又是安装 Visual C++ Build Tools 。还是没搞定

3、谷歌一圈，百度一圈最后找到个可以解决的

 set CL=/FI"C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\include\\stdint.h"

pip install pycrypto

参考：https://blog.csdn.net/lm_is_dc/article/details/109359600