from machine import Pin
from time import sleep
led1 = Pin(26,Pin.OUT)
led2 = Pin(25,Pin.OUT)
led3 = Pin(27,Pin.OUT)
while True:
    led2.value(1)
    sleep(3)
    led2.value(0)
    led3.value(1)
    sleep(1)
    led1.value(1)
    led3.value(0)
    sleep(3)
    led1.value(0)