select_stdin.py

import termios, fcntl, sys, os, select, socket, threading, time

fd = sys.stdin.fileno()

oldterm = termios.tcgetattr(fd)
newattr = oldterm[:]
newattr[3] = newattr[3] & ~termios.ICANON & ~termios.ECHO
termios.tcsetattr(fd, termios.TCSANOW, newattr)

oldflags = fcntl.fcntl(fd, fcntl.F_GETFL)
fcntl.fcntl(fd, fcntl.F_SETFL, oldflags | os.O_NONBLOCK)

try:
    server = socket.socket()
    server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    server.bind(('', 2000))
    server.listen(5)
    time.sleep(.5)
    client = socket.socket()
    client.connect(('', 2000))
    t = threading.Thread(target=lambda: [time.sleep(1), [(time.sleep(1), client.send('hey there!')) for _ in xrange(1000)]])
    t.daemon = True
    t.start()
    s, (ip, port) = server.accept()
    print 'connection from %r:%r' % (ip, port)

    while 1:
        rs, ws, es = select.select([fd, s], [], [])
        for r in rs:
            if r == sys.stdin.fileno():
                c = os.read(r, 1024)
                print "Got characters", repr(c)
                if c == "q":
                    break # quit
            if r is s:
                print "Got msg on socket", repr(s.recv(1024))
finally:
    termios.tcsetattr(fd, termios.TCSAFLUSH, oldterm)
    fcntl.fcntl(fd, fcntl.F_SETFL, oldflags)

based on http://effbot.org/pyfaq/how-do-i-get-a-single-keypress-at-a-time.htm