from gpiozero import LEDBoard
from time import sleep

leds = LEDBoard(2, 3, 4, 5, 6, 7, 8, 9)

leds[0].on()  # first led on
sleep(1)
leds[7].on()  # last led on
sleep(1)
leds[-1].off()  # last led off
sleep(1)