quintaar

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM) #sets the GPIO numering mode
GPIO.setup(2,GPIO.OUT)

while True:
	time.sleep(3)	
	GPIO.output(2,GPIO.LOW)   #sets the pin2 to provide 0V
	print 'LED should be OFF'

quintaar

import RPi.GPIO as GPIO
 
# to use GPIO number not the pin physical number
GPIO.setmode(GPIO.BCM)
"""
or to use the phisical pin numbers (1-40) instead of GPIO number
GPIO.setmode(GPIO.BOARD)
"""
# setting up pins as I/O
GPIO.setup(3, GPIO.IN)  #sets GPIO3 as INPUT

quintaar

import RPi.GPIO as GPIO
import time

sensor = 24   #your GPIO on RPI
GPIO.setmode(GPIO.BCM)
GPIO.setup(sensor, GPIO.IN, GPIO.PUD_DOWN)

current_state = False

while True:

quintaar

import os
import time
import urllib
import re
import pickle

#read file containing IPs and pass the set 
def readfile():
	yourdevices = set()	
	if not os.path.exists('test1.p'):   #corrected