Python Learning 5 Network programming-TCP/UDP

Excerpt from: Liaoche's official website: http://www.liaoxuefeng.com/

TCP client and server-side code:

#Coding=utf-8#client program TCP connectionImportSockets=Socket.socket (Socket.af_inet,socket. Sock_stream) S.connect (('127.0.0.1', 9999))Print(S.RECV (1024)) forDatainch['Michael','Tracy','Sarah']: S.send (Data.encode ())Print(S.RECV (1024)) S.send (b'Exit')

#Coding=utf-8#TCP server-side programsImportSocketImport TimeImportThreadingdefTcplink (sock,addr):Print("Accept new connection from%s:%s ..."%addr) Sock.send ("welcom!". Encode ()) whileTrue:data=SOCK.RECV (1024) Time.sleep (1)        ifdata=='Exit' or  notData: BreakSock.send ("Hello:". Encode () +data) Sock.close ()Print("Connection from%s:%s closed."%addr) S=socket.socket (Socket.af_inet,socket. SOCK_STREAM)#create a socket based on the IPv4 TCP protocolS.bind (('127.0.0.1', 9999))#Listening PortS.listen (5)Print("waiting for connection ...") whiletrue:sock,addr=s.accept () T=threading. Thread (target=tcplink,args=(sock, addr)) T.start ()

Operation Result:

for from 127.0.0.1:60218 from 127.0.0.1:60218 closed. 

b'welcom! ' b ' Hello:michael ' b ' hello:tracy ' b ' Hello:sarah '

UDP client and server-side code:

#Coding=utf-8#UDP Client CodeImportSockets=Socket.socket (Socket.af_inet,socket. SOCK_DGRAM) forDatainch["Chenshan","Yuanhui","Chendianqiang"]: S.sendto (Data.encode (), ('127.0.0.1', 9999))    Print(S.RECV (1024) ) S.close ()

#Coding=utf-8#UDP Protocol Server CodeImportSockets=Socket.socket (Socket.af_inet,socket. SOCK_DGRAM) S.bind (('127.0.0.1', 9999))Print("Bind UDP on prot:9999") whiletrue:data,addr=s.recvfrom (1024)    Print("Receive from%s:%s"%addr) s.sendto ("Hello". Encode () +data,addr)

Operation Result:

Bind UDP on prot:9999

b'hello chenshan'b'hello yuanhui'b ' Hello Chendianqiang '

Python Learning 5 Network programming-TCP/UDP