Basic select loop

s.py

#!/usr/bin/env python3

import queue
import select
import socket
import threading
import time


Q = queue.Queue()


def loop(s):
    while True:
        rlist, wlist, elist = select.select([s], [s], [s])

        # Read from sockets that are readable.
        for rsock in rlist:
            data = rsock.recv(1024).strip()
            if data:
                print(data)

        # Write to sockets that are writeable.
        for wsock in wlist:
            try:
                msg = Q.get_nowait()
            except queue.Empty:
                pass
            else:
                wsock.sendall(msg.encode())

        # Close sockets in error.
        for esock in elist:
            esock.close()

        time.sleep(0.01)


s = socket.create_connection(('www.google.com', 80))
s.setblocking(0)


t = threading.Thread(target=loop, args=(s,))
t.setDaemon(True)
t.start()


Q.join()


while True:
    try:
        msg = input('')
    except KeyboardInterrupt:
        break
    Q.put(msg + '\r\n')