UDP Echo Client ver 20150816

My latest UDP Echo Client is written in this article. This client has informations about destination UDP Server, but it is more better to pass the destination informations as command line arguments. Today's client is upgraded based on this perspective.

#!/usr/bin/env python
import argparse
import socket
import time
from contextlib import closing

parser = argparse.ArgumentParser(description = 'Command Line Argument Parser')
parser.add_argument('-host', dest = 'host', required = True)
parser.add_argument('-dport', dest = 'dport', required = True)
parser.add_argument('-sport', dest = 'sport')
argument = vars(parser.parse_args())

host = argument['host']
dport = argument['dport']
sport = argument['sport']
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
if sport != None:
    sock.bind(('', int(sport)))
with closing(sock):
    message = 'Hello!!!'
    sock.sendto(message, (host, int(dport)))
    data, server = sock.recvfrom(8192)
    print '%s returns %s' % server, data