example

client.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import socket
import time
HOST = 'localhost'
PORT = 1680
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((HOST, PORT))
s.setsockopt(socket.SOL_TCP, socket.TCP_QUICKACK, 1)

s.send('hello')
s.recv(1024)
s.close()
time.sleep(1)

server.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import socket

HOST = 'localhost'
PORT = 1680

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((HOST, PORT))
s.listen(5)

while True:
    conn, addr = s.accept()
    while True:
        data = conn.recv(1024)
        conn.setsockopt(socket.SOL_TCP, socket.TCP_QUICKACK, 1)
        conn.send(data)
        print data
        if not data:
            break
    conn.close()