Example of a synergistic program (multitask)

#!/usr/bin/python
#coding: Utf-8

From __future__ import with_statement
From Contextlib import closing
Import socket
Import multitask

def client_handler (sock):
With closing (sock):
While True:
Data= (Yield multitask.recv (sock,1024))
If not data:
Break
Yield Multitask.send (sock,data)

def echo_server (Hostname,port):
Addrinfo=socket.getaddrinfo (Hostname,port,socket.af_unspec,socket. SOCK_STREAM)
(FAMILY,SOCKTYPE,PROTO,CANONNAME,SOCKADDR) =addrinfo[0]
With closing (Socket.socket (Family,socktype,proto)) as sock:
Sock.setsockopt (socket. Sol_socket,socket. so_reuseaddr,1)
Sock.bind (SOCKADDR)
Sock.listen (5)
While True:
Multitask.add (Client_handler (yield multitask.accept (sock)) [0])

If __name__== ' __main__ ':
Import Sys
Hostname=none
port=1111
If Len (SYS.ARGV) >1:
HOSTNAME=SYS.ARGV[1]
If Len (SYS.ARGV) >2:
Port=int (Sys.argv[2])
Multitask.add (Echo_server (Hostname,port))
Try
Multitask.run ()
Except Keyboardinterrupt:
Pass

Copy of the book, after the code again to explain, at present still do not understand

Example of a synergistic program (multitask)