from machine import Pin
import time

led_pins = [2, 4, 5]  # Define GPIO pins for 3 LEDs using a list
button_pin = 0        # Define button GPIO pin
leds = [Pin(pin, Pin.OUT) for pin in led_pins]  # Initialize LEDs
button = Pin(button_pin, Pin.IN, Pin.PULL_UP)
led_index = 0         # To track which LED to toggle

while True:
    if button.value() == 0:  # Button pressed (active low)
        leds[led_index].on()  # Turn on the current LED
        time.sleep(0.5)       # Keep the LED on for a short period
        leds[led_index].off()  # Turn off the current LED
        led_index = (led_index + 1) % len(leds)  # Move to the next LED
        time.sleep(0.5)       # Debounce delay

    time.sleep(0.1)  # Short delay to prevent rapid button reading