#!/usr/bin/env python

import sys,socket

def chat_server(port):
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.bind(('',port))
        s.listen()
        conn,addr = s.accept()
        print(addr)
        while 1:
            data = conn.recv(1024)
            print(data.decode())
            reponse = input()
            conn.sendall(reponse.encode())
    except KeyboardInterrupt:
        s.close()
    finally:
        print("bye")

if __name__ == "__main__":
    try:
        chat_server(int(sys.argv[1]))
    except IndexError:
        print(f"{sys.argv[0]} demande un port en  agument")