from machine import Pin
from utime import sleep

led1 = Pin (5,Pin.OUT) 
led2 = Pin (7,Pin.OUT) 
led3 = Pin (13,Pin.OUT)

while True:
    led1.on()
    sleep(0.15)
    led1.off()

    led2.on()
    sleep(0.15)
    led2.off()

    led3.on()
    sleep(0.15)
    led3.off()