brightness.py

from Tkinter import *
import os

def set_values(val):
    os.system("echo "+str(val)+" > /sys/class/backlight/acpi_video0/brightness")

def stay_open():
    pass

master = Tk()
master.title("Brightness")

# keep window on top, and try to prevent user closing
master.wm_attributes('-topmost', 1)
master.protocol("WM_DELETE_WINDOW", stay_open)
master.resizable(0,0)

# create the slider
slider = Scale(master, from_=0, to=10, orient=HORIZONTAL, command=set_values, length=300)
slider.set(5)
slider.pack()

mainloop()