A simple server-client application in Python

simple_client.py

#!/usr/bin/python           # This is client.py file

import socket               # Import socket module

s = socket.socket()         # Create a socket object
host = socket.gethostname() # Get local machine name
port = 12345                # Reserve a port for your service.

s.connect((host, port))
print s.recv(1024)
s.close()                   # Close the socket when done

simple_server.py

#!/usr/bin/python           # This is server.py file

import socket               # Import socket module

server = socket.socket()    # Create a socket object
host = socket.gethostname() # Get local machine name
port = 12345                # Reserve a port for your service.
server.bind((host, port))   # Bind to the port

server.listen(5)            # Now wait for client connection.
while True:
   client, addr = server.accept()     # Establish connection with client.
   print 'Got connection from', addr
   client.send('Connection closed')
   client.close()                # Close the connection