from machine import Pin
from time import sleep
led1 =Pin(4,Pin.OUT)
led2=Pin(2,Pin.OUT)
led3=Pin(5,Pin.OUT)
while True:
  led1.on()
  sleep(2)
  led1.off()
  sleep(0)
  led2.on()
  sleep(1)
  led2.off()
  sleep(0)
  led3.on()
  sleep(3)
  led3.off()
  sleep(0)