server_tornado_iostream.py

#!/usr/bin/env python
from tornado import ioloop, iostream
from tornado.netutil import TCPServer

def echo(sock):
    stream = iostream.IOStream(sock)
    stream.read_until_close(lambda _: stream.close(),
                            stream.write)

def serve(addr):
    server = TCPServer()
    server.listen(addr[1], addr[0])
    ioloop.IOLoop.instance().start()

if __name__ == '__main__':
    serve(('', 5000))