from machine import Pin
from time import sleep
led1 = Pin(2, Pin.OUT)
led2 = Pin(3, Pin.OUT)
led3 = Pin(4, Pin.OUT)
led4 = Pin(6, Pin.OUT)
led5 = Pin(7, Pin.OUT)
led6 = Pin(8, Pin.OUT)
while True:
    led1.value(1)
    sleep(1)
    led1.value(0)
    led2.value(1)
    sleep(1)
    led2.value(0)
    led3.value(1)
    sleep(1)
    led3.value(0)
    led4.value(1)
    sleep(1)
    led4.value(0)
    led5.value(1)
    sleep(1)
    led5.value(0)
    led6.value(1)
    sleep(1)
    led6.value(0)