Basic GUI for shell commands with Python Tk threading and os

import sys
from Tkinter import *
from os import system as run
from time import sleep
import thread

r = Tk()
r.title('Remote Support')
t = StringVar()
t.set('Completing Remote Support Initalisation         ')
l = Label(r,  textvariable=t).pack()
def quit():
    #do cleanup if any
    r.destroy()
but = Button(r, text='Stop Remote Support', command=quit)
but.pack(side=LEFT)

def d():
    sleep(2)
    t.set('Completing Remote Support Initalisation, downloading, please wait         ')
    run('sleep 5') #test shell command
    t.set('Preparing to run download, please wait         ')
    run('sleep 5')
    t.set("OK thanks! Remote Support will now close         ")
    sleep(2)
    quit()

sleep(2)
thread.start_new_thread(d,())
r.mainloop()