Real time flood warning system

import requests
import sys
import time 
from pubnub import Pubnub


def main():
    try:


        r = requests.get('http://alert.valleywater.org/datawise/dataAPI/retrievedata.php?format=json&bydate=back&days=1&tstart=&tend=&cid=1&bytype=sensor&sid=1498')

        data = r.content

        pubnub = Pubnub(publish_key="pub-c-eb2e01a2-6ef6-4f06-a022-326c57bb65ef", subscribe_key="sub-c-628af45e-1580-11e7-9093-0619f8945a4f")
        def callback(message, channel):
            print(message)


        def error(message):
            print("ERROR : " + str(message))


        def connect(message):
            print("CONNECTED")
            print pubnub.publish(channel='rahulatt', message= str(data))



        def reconnect(message):
            print("RECONNECTED")


        def disconnect(message):
            print("DISCONNECTED")



        pubnub.subscribe(channels='rahulatt', callback=callback, error=callback,
                         connect=connect, reconnect=reconnect, disconnect=disconnect)

        time.sleep(3600) # sleep for one hour

        except KeyboardInterrupt:
            sys.ext()

if __name__=="main":
    main()