Python之创建一个session，发送message并且关闭连接

目标
程序按以下顺序接收命令行参数：

IP address
port
message for sending

实现的功能：

Create a new socket.
Connect to a host and a port using the socket.
Send a message from the third command line argument to the host using the socket.
Receive the server’s response.
Print the server’s response.
Close the socket.

原文：https://www.cnblogs.com/yatya/p/15225611.html