Socket programming In Python

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In bidirectional communications channel, sockets are two end points. Sockets can communicate between process on the same machine or on different continents.

Sockets are implemented by the different types of channel-TCP, UDP.

For creating Socket, we need socket module and socket.socket () function.

Syntax

my_socket = socket.socket (socket_family, socket_type, protocol=0)

Different methods in Server Socket

my_socket.bind()

This method is used for binding address (hostname, port number pair) to socket.

my_socket.listen()

This method is used for set up and start TCP listener.

my_socket.accept()

This method is used for accepting TCP client connection, waiting until connection arrives (blocking).

Different methods in Client Socket

my_socket.connect()

This method actively initiates TCP server connection.

General Socket Methods

my_socket.recv()

This method receives TCP message

my_socket.send()

This method transmits TCP message

my_socket.recvfrom()

This method receives UDP message

my_socket.sendto()

This method transmits UDP message

my_socket.close()

This method closes socket

my_socket.gethostname()

This method returns the hostname.

Server socket

Example

import socket
my_socket = socket.socket()      # Create a socket object
my_host = socket.gethostname()
my_port = 00000# Store a port for your service.
my_socket.bind((my_host, my_port))
my_socket.listen(5)      # Now wait for client connection.
while True:
   cl, myaddr = my_socket.accept()     # Establish connection with client.
   print ('Got connection from', myaddr)
   cl.send('Thank you for connecting')
   cl.close()     # Close the connection

Client socket

Example

import socket      # Import socket module
my_socket = socket.socket()      # Create a socket object
my_host = socket.gethostname()     # Get local machine name
my_port = 00000# Store a port for your service.
my_socket.connect((my_host, my_port))
print (my_socket.recv(1024))
my_socket.close

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