import _thread
from machine import Pin
import time

cero = Pin(15, Pin.OUT) 
uno = Pin(2, Pin.OUT)
dos = Pin(0, Pin.OUT)
tres = Pin(4, Pin.OUT) 
cuatro = Pin(16, Pin.OUT)
cinco = Pin(17, Pin.OUT)
seis = Pin(5, Pin.OUT)
siete = Pin(18, Pin.OUT)

leds = [cero, uno, dos, tres, cuatro, cinco, seis, siete]

def derecha():
    while True:
        for elemento in leds [7:3:-1]:
            elemento.value(1)
            time.sleep(1)
            elemento.value(0)
            time.sleep(1)

_thread.start_new_thread(derecha,())

def izquierda():
    for elemento in leds[0:4:1]:
            elemento.value(1)
            time.sleep(1)
            elemento.value(0)
            time.sleep(1)

while True:
    izquierda()
    time.sleep(1)

if __name__==("__main__"):
    main()