python socket:
参考：https://blog.csdn.net/liu915013849/article/details/78869771
参考：https://blog.csdn.net/wunghao8/article/details/40984151
IDE pycharm:
https://www.cnblogs.com/iamjqy/p/7000874.html
Git:
pull\push\commit:https://segmentfault.com/q/1010000009549291
learning note:
