import board
import digitalio
import time

led1 = digitalio.DigitalInOut(board.GP0) 
led1.direction = digitalio.Direction.OUTPUT


led2 = digitalio.DigitalInOut(board.GP1)
led2.direction = digitalio.Direction.OUTPUT


led3 = digitalio.DigitalInOut(board.GP2)
led3.direction = digitalio.Direction.OUTPUT

taster = digitalio.DigitalInOut(board.GP28)
taster.direction = digitalio.Direction.INPUT
taster.pull = digitalio.Pull.DOWN

while True:
     led3.value = not taster.value
     if taster.value: 
         led3.value= False
         led2.value = True
         time.sleep(1)
         led2.value = False
         led1.value = True
         time.sleep(4)
         led1.value = False
         led2.value= True
         time.sleep(1)
         led2.value = False