import time
from machine import Pin

pin_index_list = [15,2,0,4,16,17,5,18,19,21]

led_pin_list = []

for i in pin_index_list:
    led_pin_list.append(Pin(i, Pin.OUT))

num = len(led_pin_list)

for led_pin in led_pin_list:
    led_pin.value(0)

while True:

    for i in range(num):
        led_pin_list[i].value(1)
        if i == 0:
            led_pin_list[num - 1].value(0)
        else:
            led_pin_list[i - 1].value(0)

        time.sleep(0.1)