etec224 button with 3 leds code

etec224-button.py

#!/usr/bin/python3

import RPi.GPIO as GPIO
from time import sleep

LED_G = 21
BUTTON = 17

PRESSED = 0
RELEASED = 1

GPIO.setmode(GPIO.BCM)

GPIO.setup(LED_G, GPIO.OUT)
GPIO.setup(BUTTON, GPIO.IN, pull_up_down=GPIO.PUD_UP)

try:
    while True:
        button_state = GPIO.input(BUTTON) # Read the button
        if button_state == RELEASED:       # CHECK if pressed
            i = 12                           # set counter to 5
            state = 1                       # set value of state
            while i>0:                      # Loop
                if GPIO.input(BUTTON)== PRESSED:
                    break
                GPIO.output(LED_G, state)   # swtich the LED
                state = not state           # invert the state
                i = i - 1                   # decrement count
                sleep(0.01)                  # Sleep and repeat

except KeyboardInterrupt:
    print("Ctrl+C Detected")
    GPIO.cleanup()