import socket

BUF_SIZE = 1024
server_addr = ('127.0.0.1',8888)
server = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
server.bind(server_addr)
while True:
     print "waiting for data"
     data,client_addr = server.recvfrom(BUF_SIZE)
     print 'Connected by ',client_addr,' Receive data : ',data
     server.sendto(data,client_addr)
server.close()

import socket
import struct

BUF_SIZE = 1024
server_addr = ('127.0.0.1',8888)
client = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)

while True:
     data = raw_input("Please input some string > ")
     client.sendto(data,server_addr)
     data,addr = client.recvfrom(BUF_SIZE)
     print "Data : ",data
client.close()