Where are you & im here

imhere.py

"i'm here"
import socket
import getpass
from time import sleep
Port = 8789
User = getpass.getuser()
Delta = 3.0

dest = ('<broadcast>' , Port)
s = socket.socket(socket.AF_INET , socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET , socket.SO_BROADCAST, 1)

while 1:
    s.sendto("%s is here" % User, dest)
    sleep(Delta)

whru.py

"where are you?"
import socket, sys
import re
Port = 8789
found = []
s = socket.socket(socket.AF_INET , socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET , socket.SO_BROADCAST , 1)
s.setsockopt(socket.SOL_SOCKET , socket.SO_REUSEADDR , 1)
s.bind(('', Port))

patt = re.compile(r'(.+) is here')

while True:
    mess, addr = s.recvfrom(1024)
    try:
        user = patt.match(mess).groups()[0]
        if (user, addr) not in found:
            print 'found %s at %s' % (user, addr)
            found.append((user, addr))
    except AttributeError:
        print >> sys.stderr, 'message [%s] not recognized' % mess