https://blog.csdn.net/u013498583/article/details/74231058
https://www.cnblogs.com/youxin/p/4073703.html
https://blog.csdn.net/swfa1/article/details/52573645
https://blog.csdn.net/qq_28256625/article/details/78893707
whereis protoc:查看所有的protocol安装路径 protoc --version: 查看当前的protocol版本 (系统下是2.6.1, anaconda中是3.5.1)