Stream socket:client program python

import socket
import sys

# Create a UDP socket
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

server_address = ('localhost', 10000)
message = 'message sent from client.'

try:

    # Send data
    print >>sys.stderr, 'sending "%s"' % message
    sent = sock.sendto(message, server_address)

    # Receive response
    print >>sys.stderr, 'waiting to receive'
    data, server = sock.recvfrom(4096) #this is buffer size
    print >>sys.stderr, 'received "%s"' % data

finally:
    print >>sys.stderr, 'closing socket'
    sock.close()

Stream Socket:server program python

import socket
import sys

# Create a TCP/IP socket
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

# Bind the socket to the port
server_address = ('localhost', 10000)

print >>sys.stderr, 'starting up on %s port %s' % server_address

sock.bind(server_address)

data_from_server = 'this is message from server.'

while True:
    print >>sys.stderr, '\nwaiting to receive message'
    data, address = sock.recvfrom(4096) #this is buffer size

    print >>sys.stderr, 'received %s bytes from %s' % (len(data), address)
    print >>sys.stderr, data

    if data:
        sent = sock.sendto(data_from_server, address)
        print >>sys.stderr, 'sent %s bytes back to %s' % (sent, address)