from machine import Pin
import time

led_list = [2]

led_pin_list = []

for led in led_list:
    led_pin_list.append(Pin(led, Pin.OUT))



while True:
    for p in led_pin_list:
        p.value(not p.value())
        time.sleep(0.3)
    led_pin_list.reverse()

led.on()