D-Bus_Pidgin_Alerter.py

#!/usr/bin/env python

import dbus, gobject
import pynotify
from lxml import etree
from dbus.mainloop.glib import DBusGMainLoop

def my_func(account, sender, message, conversation, flags):
    xml_data = message
    root = etree.fromstring(xml_data)
    pynotify.init( "Pidgin Alert" )
    n = pynotify.Notification(sender, root[0][0].text, "dialog-info")
    # number of secs to display message
    n.set_timeout(10000)
    n.show()

dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
bus = dbus.SessionBus()

bus.add_signal_receiver(my_func,
                        dbus_interface="im.pidgin.purple.PurpleInterface",
                        signal_name="ReceivedImMsg")

loop = gobject.MainLoop()
loop.run()