My first RPi GPIO coding - Driving pins (for LEDs, relays, etc.)

pi_gpio_hack.py

#!/usr/bin/env python3

"""Usage:
         ./pi_gpio_hack.py '[3,0,5,1]'               # pin 3 on, pin 5 off
         ./pi_gpio_hack.py '[3,0,5,1]' -b            # pin 3 on, pin 5 off, and blink
         ./pi_gpio_hack.py '[[3,0,5,1],[3,1,5,0]]'   # toggle between pins 3 & 5
"""

import json
import sys
import time
import RPi.GPIO as GPIO

delay = 0.3
pattern = json.loads(sys.argv[1])
if len(sys.argv) > 2 and sys.argv[2] == '-b':
    blink = True
else:
    blink = False

def out(pins):
    GPIO.setmode(GPIO.BOARD)
    while len(pins) > 1:
        pin, value = (int(pins[0]), int(pins[1]))
        GPIO.setup(pin, GPIO.OUT)
        GPIO.output(pin, value)
        pins = pins[2:]

def loop():
    try:
        while True:
            for p1 in pattern:
                if type(p1) == list:
                    out(p1)
                    time.sleep(delay)
                elif type(p1) == int:
                    out(pattern)
                    time.sleep(delay)
                    if blink:
                        GPIO.cleanup()
                        time.sleep(delay)
                    break
    except KeyboardInterrupt:
        pass
    finally:
        GPIO.cleanup()
        print()

loop()