from time import sleep
from machine import Pin
leds = [Pin(9, Pin.OUT, value=0), Pin(8, Pin.OUT, value=0), Pin(7, Pin.OUT, value=0)]
btn = Pin(6, Pin.IN, Pin.PULL_UP)

print(f"LED: red: {leds[0].value()} green: {leds[1].value()} blue: {leds[2].value()}")
# output display value
def display(val):
    for col in range(3):
        if val & (1 << col):
            leds[col].on()
        else:
            leds[col].off()
pos = 1
while True:
    try:
        # complete CODE here
    except KeyboardInterrupt:
        break
for col in range(3):
    leds[col].off()
print("Finished.")