Python---TCP/IP network programming

Key Summary:

Server: Running (while true), listening for a port on a running machine (IP), multi-threaded or multi-process receive client socket request

Client: Unsolicited request, need to know the IP and port of the server

Service side:

#-*-Coding:utf-8-*-
Import time
Import socket
Import threading
def tcplink (sock, addr):
    Print' Accept new connection from%s:%s ... '% addr
Sock.send (' welcome! ')
 WhileTrue:
data = SOCK.RECV (1024)
Time.sleep (1)
 if data = =' Exit 'Or not data:
 Break
Sock.send (' Hello,%s! '% data)
Sock.close ()
 Print' Connection from%s:%s closed. '% addr


s = socket.socket (socket.af_inet, socket. SOCK_STREAM)
S.bind ((' 127.0.0.1 ',9999))
S.listen (5)
Print' Waiting for connection ... '
While True:
# Accept a new connection:
Time.sleep (5)
print ' SDASDASD '
Sock, addr = S.accept ()
Print Sock
Print Addr
# Create a new thread to handle the TCP connection:
t = Threading. Thread (target=tcplink, args= (sock, addr))
T.start ()

Client:

#-*-Coding:utf-8-*-
Import time
Import socket
s = socket.socket (socket.af_inet, socket. SOCK_STREAM)
# to establish a connection:
S.connect ((9999)) 
 # receive Welcome message: 
 1024) 
 for Data in [ Michael ',  Tracy ',  Sarah": 
 # send data: 
  S.send (data) 
 print s.recv (1024) 
 S.send ( ' exit ') 
 S.close ()           

Python---TCP/IP network programming