from machine import Pin
from time import sleep
led_pins= [2,4,5,13,14,27,19,18]
leds = [Pin(Pin, pin.OUT) for Pin in
    led_pins]

 
 button1= Pin(12,Pin.IN, Pin.Pull_UP)
 button2 = Pin(14,Pin.IN, Pin.Pull_UP)

 count = 0
     
     while True
     if button1.value() ==0 :
      if count < len(leds):
        count += 1
        sleep(0.3)
    
    if button2.value() == 0 :
       if count > 0:
        count -= 1
        sleep(0.3)
for i in range(len(leds)):
            leds[i].value(1 if i < count else 0)