export XAUTHORITY=/var/run/gdm3/auth-for-user-ECfX3p/database
export DISPLAY=:0

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

import gtk.gdk
import pynotify
import random

m=[]
m.append("t1")
m.append("t2")
m.append("t3")

n = pynotify.Notification(random.choice(m))
n.set_hint('x', gtk.gdk.screen_width()/2.)
n.set_hint('y', gtk.gdk.screen_height()/2.)
n.show()