EffectServer example in English. The actual server with a mockup option can be forked at https://github.com/epeli/effectserver/. I did not test this myself, but the same code (originally in Finnish) has been used at a LAN party for a few years now

gistfile1.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

import socket
import time

class LightServer(object):
    """
    Sends light commands to DMX light server. Can be used to envelope
    multiple commands to a single packet.
    """

    def __init__(self, nick, ip, port):
        self.ip = ip
        self.port = port
        self.nick = nick

        self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        self.reset()

    def reset(self):
        """Resets UDP packet"""
        self.packet = [ 1 ] # Spec version, always 1

        self.packet.append(0) # Begin tag part
        for char in self.nick:
            # Convert nick to ASCII codes
            self.packet.append(ord(char))
        self.packet.append(0) # End tag part

    def set(self, i, r, g, b):
        """Sets light i to an RGB value"""
        self.packet += [
            1, # Effect type 1 (light)
            i, # Light index
            0, # Extension byte. Always 0
            r, # Red
            g, # Green
            b, # Blue
        ]

    def send(self):
        """Sends set bytes and resets effect list"""
        bytes = bytearray(self.packet)
        self.socket.sendto(bytes, (self.ip, self.port))
        self.reset()

lights = LightServer("myLights", "example.com", 9909)

# Set all lights blue
for i in range(0, 5):
    lights.set(i, 0, 0, 255)
# Send all "set light to blue" commands at once
lights.send()

# Looping green colour
i = 0

while True:
    lights.set(i, 0, 255, 0)
    lights.send()

    time.sleep(0.3)

    lights.set(i, 0, 0, 255)
    lights.send()

    i += 1
    i = i % 36

    print i