golden hour

/lib64/python2.7/Demo/sockets

File/Folder	Size	Actions
README	628 B
broadcast.py	283 B
broadcast.pyc	546 B
broadcast.pyo	546 B
echosvr.py	739 B
echosvr.pyc	826 B
echosvr.pyo	826 B
finger.py	1.23 KB
finger.pyc	1.13 KB
finger.pyo	1.13 KB
ftp.py	3.84 KB
ftp.pyc	2.88 KB
ftp.pyo	2.88 KB
gopher.py	9.55 KB
gopher.pyc	10.08 KB
gopher.pyo	10.08 KB
mcast.py	2.16 KB
mcast.pyc	2.12 KB
mcast.pyo	2.12 KB
radio.py	287 B
radio.pyc	470 B
radio.pyo	470 B
rpython.py	714 B
rpython.pyc	981 B
rpython.pyo	981 B
rpythond.py	1.19 KB
rpythond.pyc	1.3 KB
rpythond.pyo	1.3 KB
telnet.py	2.94 KB
telnet.pyc	2.1 KB
telnet.pyo	2.1 KB
throughput.py	2.04 KB
throughput.pyc	2.41 KB
throughput.pyo	2.41 KB
udpecho.py	1.43 KB
udpecho.pyc	1.98 KB
udpecho.pyo	1.98 KB
unicast.py	230 B
unicast.pyc	455 B
unicast.pyo	455 B
unixclient.py	232 B
unixclient.pyc	424 B
unixclient.pyo	424 B
unixserver.py	414 B
unixserver.pyc	593 B
unixserver.pyo	593 B

Edit: mcast.py

#! /usr/bin/env python
#
# Send/receive UDP multicast packets.
# Requires that your OS kernel supports IP multicast.
#
# Usage:
#   mcast -s (sender, IPv4)
#   mcast -s -6 (sender, IPv6)
#   mcast    (receivers, IPv4)
#   mcast  -6  (receivers, IPv6)

MYPORT = 8123
MYGROUP_4 = '225.0.0.250'
MYGROUP_6 = 'ff15:7079:7468:6f6e:6465:6d6f:6d63:6173'
MYTTL = 1 # Increase to reach other networks

import time
import struct
import socket
import sys

def main():
    group = MYGROUP_6 if "-6" in sys.argv[1:] else MYGROUP_4

if "-s" in sys.argv[1:]:
        sender(group)
    else:
        receiver(group)

def sender(group):
    addrinfo = socket.getaddrinfo(group, None)[0]

s = socket.socket(addrinfo[0], socket.SOCK_DGRAM)

# Set Time-to-live (optional)
    ttl_bin = struct.pack('@i', MYTTL)
    if addrinfo[0] == socket.AF_INET: # IPv4
        s.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, ttl_bin)
    else:
        s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_HOPS, ttl_bin)

while True:
        data = repr(time.time())
        s.sendto(data + '\0', (addrinfo[4][0], MYPORT))
        time.sleep(1)

def receiver(group):
    # Look up multicast group address in name server and find out IP version
    addrinfo = socket.getaddrinfo(group, None)[0]

# Create a socket
    s = socket.socket(addrinfo[0], socket.SOCK_DGRAM)

# Allow multiple copies of this program on one machine
    # (not strictly needed)
    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

# Bind it to the port
    s.bind(('', MYPORT))

group_bin = socket.inet_pton(addrinfo[0], addrinfo[4][0])
    # Join group
    if addrinfo[0] == socket.AF_INET: # IPv4
        mreq = group_bin + struct.pack('=I', socket.INADDR_ANY)
        s.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
    else:
        mreq = group_bin + struct.pack('@I', 0)
        s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP, mreq)

# Loop, printing any data we receive
    while True:
        data, sender = s.recvfrom(1500)
        while data[-1:] == '\0': data = data[:-1] # Strip trailing \0's
        print (str(sender) + '  ' + repr(data))

if __name__ == '__main__':
    main()