from machine import Pin
from utime import sleep

leds = [
    Pin(23, Pin.OUT), 
    Pin(5, Pin.OUT),
    Pin(19, Pin.OUT),
    Pin(18, Pin.OUT),
    Pin(0, Pin.OUT)
]

while True:
    for i in range(1,5,2):
        leds[i].value(1)
        sleep(1)
        leds[i].value(0)
    
    for i in range(4, -1, -2):
        leds[i].value(1)
        sleep(1)
        leds[i].value(0)