import time
from machine import Pin

def blink(led, delay_time):
  led.value(not led.value())
  time.sleep(delay_time)

led1_pin = Pin(18, Pin.OUT)
led2_pin = Pin(19, Pin.OUT)

while True:
  blink(led1_pin, 0.5)
  blink(led2_pin, 0.7)