Python Network programming

Tag: Return using ROM Code connect GPO ODI end--

Introduction: Network programming is mainly divided into UDP and TCP two, UDP does not need to create a connection, so the transfer speed, but not robust, TCP needs to create a connection, so the transmission speed is slow, but robust, now, most applications use TCP to communicate.

A, UDP

1.send Terminal

1) Guide Package from socket import *

2) Create Udpsocket object, Udpsocket = socket (af_inet,sock_dgream)

3) Call the object to send the message, Udpsocket.sendto ("hello,udp, I Came". Encode ("Utf-8"), ("The IP address of the machine you want to send", the port)

4) Close Udpsocket object, Udpsocket.close ()

2.recive Terminal

1) Guide Package from socket import *

2) Create Udpsocket object, Udpsocket = socket (af_inet,sock_dgream)

3) Bind IP and port, Udpsocket.bind (("IP address of the machine you want to receive", port)

4) Receive data, Udpsocket.recvfrom (1024)

5) Close Udpsocket object, Udpsocket.close ()

　　

1  fromSocket Import *2 3Udpsocket =socket (Af_inet,sock_dgram)4 #使用udp发送的数据, each time the need to write on the receiver's IP and port, you can tell the receiver in what way to encode5Udpsocket.sendto ("haha\n". Encode ("gb2312"),("172.25.6.222",8080))6 7Udpsocket.sendto ("Oh, hello.". Encode ("Utf-8"),("202.193.52.52",1880))

Send End 　　

1 # coding = Utf-8 2 3  from Import *4 udpsocket = socket (af_inet,sock_dgram)56 udpsocket.bind (( ", 8080))7 recvdata = Udpsocket.recvfrom (1024x768)8Print (Recvdata[0].decode ("utf-8"))

recive End

Second, TCP

1.server Terminal

1) Guide Package from socket import *

2) Create Tcpsocket object, Tcpsocket = socket (af_inet,sock_stream)

3) Bind IP and port, tcpsocket.bind ("Server-side IP", port)

4) Monitoring, Tcpsocket.listen (5)

5) Receive client side, Clientsocket,clientinfo = Tcpsocket.accept ()

6) Print client-side request information, RecvData = CLIENTSOCKET.RECV (1024x768), print (RecvData)

2.client Terminal

1) Guide Package from socket import *

2) Create Tcpsocket object, Tcpsocket = socket (af_inet,sock_stream)

3) Connect server side, Tcpsocket.connect ("Server IP Address", port)

4) Send data to server side, Clientsocket.send ("hello,tcp, here I Come". Encode ("Utf-8"))

5) Print the information returned from server side, RecvData = Clientsocket.recv (1024x768), print (RecvData)

6) Close the client, Clientsocket.close ()

　　

1  fromSocketImport*2 3ServerSocket =socket (af_inet, sock_stream)4 5Serversocket.bind (("", 8899))6 7Serversocket.listen (5)8 9 Print("-----1-----")TenClientsocket,clientinfo =serversocket.accept () One  A Print("-----2-----") - #Clientsocket indicates that the new client - #The clientinfo represents the IP of this new client and the port the  -RecvData = CLIENTSOCKET.RECV (1024) -  - Print("-----3-----") + Print("%s:%s"%(str (clientinfo), recvdata)) -  + clientsocket.close () AServersocket.close ()

Server Side 　　

1  fromSocketImport*2 3Clientsocket =socket (af_inet, sock_stream)4Clientsocket.connect (("192.168.119.153", 8989))5 6 #Note:7 #1. The TCP client has already linked the server, so in the future data send, do not need to fill in the other iph and port-----> Phone8 #2. UDP When sending data, because there is no previous link, according to the need to fill in each send the receiver's IP and port-----> letter9Clientsocket.send ("haha". Encode ("gb2312"))Ten  OneRecvData = CLIENTSOCKET.RECV (1024) A  - Print("recvdata:%s"%recvdata) -  theClientsocket.close ()

Client Side

Python Network programming