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Python Program that Sends And Receives Message from Client
  • Difficulty Level : Hard
  • Last Updated : 17 Jun, 2021

Socket programming is a way of connecting two nodes on a network to communicate with each other. One socket(node) listens on a particular port at an IP, while the other socket reaches out to the other to form a connection. The server forms the listener socket while the client reaches out to the server.
Socket programming is started by importing the socket library and making a simple socket. 
 

import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

Here we made a socket instance and passed it two parameters. The first parameter is AF_INET and the second one is SOCK_STREAM. AF_INET refers to the address family ipv4. The SOCK_STREAM means connection-oriented TCP protocol.
Note: For more information, refer to Socket Programming in Python
Now we can connect to a server using Server:
A Server is a program that provides service to other computers on the network or Internet. Similarly, a client is a program that receives services from the server. When a server wants to communicate with a client, there is a need for a socket. A socket is a point of connection between the server and the client.
TCP/IP server program that sends message to the client. 
 

Python3




import socket
  
# take the server name and port name
host = 'local host'
port = 5000
  
# create a socket at server side
# using TCP / IP protocol
s = socket.socket(socket.AF_INET,
                  socket.SOCK_STREAM)
  
# bind the socket with server
# and port number
s.bind(('', port))
  
# allow maximum 1 connection to
# the socket
s.listen(1)
  
# wait till a client accept
# connection
c, addr = s.accept()
  
# display client address
print("CONNECTION FROM:", str(addr))
  
# send message to the client after
# encoding into binary string
c.send(b"HELLO, How are you ? \
       Welcome to Akash hacking World")
 
msg = "Bye.............."
c.send(msg.encode())
  
# disconnect the server
c.close()

TCP/IP server program that receive message from server. 
 

Python3






import socket
  
# take the server name and port name
  
host = 'local host'
port = 5000
  
# create a socket at client side
# using TCP / IP protocol
s = socket.socket(socket.AF_INET,
                  socket.SOCK_STREAM)
  
# connect it to server and port
# number on local computer.
s.connect(('127.0.0.1', port))
  
# receive message string from
# server, at a time 1024 B
msg = s.recv(1024)
  
# repeat as long as message
# string are not empty
while msg:
    print('Received:' + msg.decode())
    msg = s.recv(1024)
 
# disconnect the client
s.close()

Note: Open In Two Separate DOS Windows And First Execute server, then Execute client.
Output of Server:
 

Output of Client: 
 

 

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