This python script queries iTunes update url to see if iPhone OS 3.0 has been released for the iPhone 3G

iphone-update-checker.py

import urllib2
import re
from time import sleep

class PageScraper(object):
    """
    This class scrapes a url for a string, can be used with a loop.
    """
    
    def __init__(self, url, string=''):
        self.url = url
        self.string = string
        
        self.page = ''
        self.request = None
    
    def pull(self):
        """
        This method pull's the request and saves it as self.page.
        """
        if self.request == None:
            self.request = urllib2.Request(self.url)
        
        try:
            self.page = urllib2.urlopen(self.request).read()
        except urllib2.HTTPError:
            self.page = ''
    
    def search(self):
        """
        Search for a string in self.page.
        """
        return self.string in self.page
    
    def loop(self, delay=5.0):
        """
        Loop until the string is found.
        """
        while 1:
            update.pull()
            
            if update.search():
                return True
            
            sleep(delay)

if __name__ == "__main__":
    update = PageScraper('http://ax.phobos.apple.com.edgesuite.net/WebObjects/MZStore.woa/wa/com.apple.jingle.appserver.client.MZITunesClientCheck/version', 'iPhone1,2_3.0_7A341')
    if update.loop(delay=10.0):
        print 'iPhone 3G 3.0 Update found'