Python siren control
Here are some code style and organization notes:


remove unused imports (sys, requests)
import time is also not needed since you are immediately shadowing it after by defining the variable time
missing datetime import
organize imports per PEP8
use consistent 4-space indents
no need for extra space after the function and before the opening parenthesis - e.g. siren() vs siren ()
let's avoid hardcoding the constant values, like the number 7 and define it in a, say, GPIO_PIN "constant"
let's move all the initial setup code to under the "main" block of the program
use print() as a function as opposed to a statement (for Python 3.x compatibility)


Here is the improved initial part of the code without the "scraping" part:

from datetime import datetime
from time import sleep

import RPi.GPIO as GPIO
from clint.textui import puts, colored
from scraper import Scraper


GPIO_PIN = 7


def setup_gpio():
    """Sets GPIO siren is attached too."""
    GPIO.setmode(GPIO.BOARD)
    GPIO.setup(GPIO_PIN, GPIO.OUT)


def siren():
    """Make a siren (flash) on a desired output pin."""
    GPIO.output(GPIO_PIN, GPIO.HIGH)
    sleep(30)
    GPIO.output(GPIO_PIN, GPIO.LOW)


if __name__ == "__main__":
    print("Starting")
    print("Monitoring")

    now = datetime.now()

    setup_gpio()


Note that I've renamed time variable to a more readable now.



As far as the rest of the code in the "main" block of the program:


please see if there is a better way to register a handler for the scraper - instead of defining a decorator, define the handler function before the "main" block and call register_handler() passing in the function:

scraper.register_handler(handler)

the time comparisons can be improved by using the .hour attribute of a datetime and short-circuiting:

if 8 &lt; now.hour &lt; 20:

you can omit the last "else" + "return" branch 
the prints around the siren() call should probably be put into the siren() function itself to avoid the code duplication