from machine import Pin
from utime import sleep

led1 = Pin(0, Pin.OUT)
led2 = Pin(1, Pin.OUT)
led3 = Pin(14, Pin.OUT)
led4 = Pin(15, Pin.OUT)

arr = [led1, led2, led4, led3]

while True:
  for el in arr:
    el.value(1)
    sleep(1)
    el.value(0)
    sleep(1)