Basic CD4017BE implementation for Raspberry Pi

basic_cd4017be.py

#!/usr/bin/env python
import RPi.GPIO as GPIO

input_pin = 14
output_pins = [22, 17, 5, 6, 13, 12, 25, 24, 27, 23]
GPIO.setmode(GPIO.BCM)
GPIO.setup(input_pin, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
for pin in output_pins:
    GPIO.setup(pin, GPIO.OUT)
i = 0
active_pin = output_pins[0]
while True:
    GPIO.wait_for_edge(input_pin, GPIO.FALLING)
    GPIO.output(active_pin, GPIO.LOW)
    active_pin = output_pins[i % len(output_pins)]
    GPIO.output(active_pin, GPIO.HIGH)
    i += 1