from machine import Pin
import time
led1=Pin(0,Pin.OUT)
led2=Pin(1,Pin.OUT)
led3=Pin(2,Pin.OUT)
led4=Pin(3,Pin.OUT)
def singleled():
    led1.value(1)
    time.sleep(0.5)
    led1.value(0)
    led2.value(1)
    time.sleep(0.5)
    led2.value(0)
    led3.value(1)
    time.sleep(0.5)
    led3.value(0)
    led4.value(1)
    time.sleep(0.5)
    led4.value(0)
def reverse_singleled():
    led4.value(1)
    time.sleep(0.5)
    led4.value(0)
    led3.value(1)
    time.sleep(0.5)
    led3.value(0)
    led2.value(1)
    time.sleep(0.5)
    led2.value(0)
    led1.value(1)
    time.sleep(0.5)
    led1.value(0)

def doubleled():
    led1.value(1)
    led2.value(1)
    time.sleep(0.5)
    led1.value(0)
    led2.value(0)
    led3.value(1)
    led4.value(1)
    time.sleep(0.5)
    led3.value(0)
    led4.value(0)
def reverse_doubleled():
    led3.value(1)
    led4.value(1)
    time.sleep(0.5)
    led3.value(0)
    led4.value(0)
    led1.value(1)
    led2.value(1)
    time.sleep(0.5)
    led1.value(0)
    led2.value(0)

while True:
    singleled()
    time.sleep(0.5)
    reverse_singleled()
    time.sleep(0.5)
    doubleled()
    time.sleep(0.5)
    reverse_doubleled()
    time.sleep(0.5)