Python script for listening to Raspberry Pi button push

button.py

import requests
import time
import RPi.GPIO as GPIO

url = 'http://nightlight/' # I map this to my internal DNS hosting the node app
gpio_pin=18 # The GPIO pin the button is attached to
longpress_threshold=5 # If button is held this length of time, tells system to leave light on

GPIO.setmode(GPIO.BCM)
GPIO.setup(gpio_pin, GPIO.IN, pull_up_down=GPIO.PUD_UP)

while True:
    time.sleep(0.2)

    if GPIO.input(gpio_pin) == False: # Listen for the press, the loop until it steps
        print "Started press"
        pressed_time=time.time()
        while GPIO.input(gpio_pin) == False:
            time.sleep(0.2)

        pressed_time=time.time()-pressed_time
        print "Button pressed %d, POSTing to nightlight server" % pressed_time
        if pressed_time<longpress_threshold:
            data = dict(light=2, cmd="toggle-with-timer")
        else:
            data = dict(light=2, cmd="toggle-keep-on")

        r = requests.post(url, data=data, allow_redirects=True)
        print r.content