Checking if a sentence goes away from a page.

page_checker.py

import requests
import time 
from datetime import datetime
from bs4 import BeautifulSoup

URL="http://www.plosone.org/search/advanced?pageSize=12&sort=&queryField=author&queryTerm=&unformattedQuery=author%3A%22Michele+Mattioni%22&journalOpt=some&filterJournals=PLoSONE&subjectCatOpt=all&filterArticleTypeOpt=all"
SENTENCE_WHICH_SHOULD_CHANGE="There were no results"

article_out = False

while not article_out:
    request = requests.get(URL)
    soup = BeautifulSoup(request.text)
    if SENTENCE_WHICH_SHOULD_CHANGE in soup.get_text():
        print "{0} Still no result".format(datetime.now())
        time.sleep(30)
    else:
        print "{0} Results found! Article should be out!".format(datetime.now())
        print "Check the URL: {0}".format(URL)
        article_out = True