Hudson Checker with growl notification

hud.py

#!/usr/bin/env python
from pyquery import PyQuery as pq
import re
import os
import time

HUDSON_URL = 'https://hudson.mozilla.org/job/amo-master/lastBuild/'

old_status = ''

while True:
    doc = pq(url=HUDSON_URL)
    h1 = doc('h1').html()

    build_num = re.search('Build \#([0-9,]+)', h1).group(1)
    build_status = doc('h1').find('img').attr('tooltip')

    if build_status == "In progress":
        build_progress = doc('h1').find('.progress-bar-done').attr('style')
        build_progress = re.search('[0-9]+\%', build_progress).group()
        os.system('growlnotify -m "Build %d: %s (%s)" Hudson' %
            (int(build_num), build_status, build_progress))
        time.sleep(60)
    else:
        if build_status != old_status:
            os.system('growlnotify -m "Build %d: %s" Hudson' %
                (int(build_num), build_status))
            time.sleep(300)

    old_status = build_status

Tongue-in-cheek backgrounding instructions:
% ./hud.py&