Apple macbook white effect

#!/usr/bin/python3
import os
import time

values = [x / 100.0 for x in range(1, 101)]

def change_brightness(value):
    os.system('brightness {}'.format(value))
    time.sleep(0.006)

def reset_to_max():
    change_brightness(1.0)

def increase():
    for value in values:
        change_brightness(value)

def reduce():
    for value in reversed(values):
        change_brightness(value)


if __name__ == '__main__':
    while 1:
        try:
            reset_to_max()
            reduce()
            increase()
        except KeyboardInterrupt:
            break