import digitalio
import board
import time
ledA3 = digitalio.DigitalInOut(board.A3)
ledA2 = digitalio.DigitalInOut(board.A2)
ledA3.direction = digitalio.Direction.OUTPUT
ledA2.direction = digitalio.Direction.OUTPUT
while True:
    ledA2.value = True
    ledA3.value = False
    time.sleep(0.5)
    ledA2.value = False
    ledA3.value = True
    time.sleep(0.5)