from machine import Pin
from time import sleep

leds = [
    Pin(23,Pin.OUT),
    Pin(22,Pin.OUT),
    Pin(21,Pin.OUT),
    Pin(19,Pin.OUT),
    Pin(18,Pin.OUT),
    Pin(5,Pin.OUT),
    Pin(17,Pin.OUT),
    Pin(16,Pin.OUT),
]

def light_on():
    for led in leds:
        led.on()  
        sleep(0.5)  

def light_off():
    for led in reversed(leds):
        led.off()  
        sleep(0.5)  


def light_on_off():
    for i in range(4):
        for j in range(8):
            if (i + j) % 2 == 0:
                leds[j].on()
            else:
                leds[j].off()
        sleep(0.5)  


light_on()  
sleep(1)  
light_off() 
sleep(1) 
light_on_off()