Most simple basic of internet programming based on two different machines sharing the same local net

This blog is just shown for the most simple basic of internet programming based on two different machines sharing the same local net.While the client sends data to server, server just sends back data with timestamps

Server

(1)Parameter configure

import socket
from time import ctime

Host=""   # host name,default to server machine's IP

Port=1300 

addr=(Host,Port) 

Bufsize=1024 # The maximum amount of data to be received at once is specified by bufsize

(2)Create server

Server=socket.socket(socket.AF_INET,socket.SOCK_STREAM)

AF-->address family,such as AF_LOCAL,AF_INET;SOCK_STREAM specifies using TCP,while SOCK_DGRAM specifies UDP.

Server.bind(addr)

Server.listen(5)

while True:
print('...Waiting to be connected...')
client,address=Server.accept() # default to be block mode,that is blocking while waiting. input() also has a flavor of block
while True:
data=client.recv(Bufsize)
if not data:
break
print(data)
client.send(bytes(ctime(),'utf8')+data)
client.close()

Server.close()

** In a summary**, server is just created as a socket object through socket.socket(),and then bind() this socket object with the machine, and then listen(), following that, going into

Client

Parameter config

import socket

Host='192.168.1.7'

Host number can be checked out by this: On the server machine,cmd-->ipconfig/all--->IPv4 address:192.168.1.7

Port=1300 # The same with server's port 

Address=(Host,Port)

BufSize=1024

Create client

Client=socket.socket(socket.AF_INET,socket.SOCK_STREAM)

Client.connect(Address)

While True:
data=input('>>>')
if not data:
break
Client.send(bytes(data,'utf8'))
data=Client.recv(BufSize)
if not data:
break
print(data.decode('utf8'))

Client.close()