Форум Всеукраїнської інтернет-олімпіади NetOI

#sample: waiting for particular changes at given url
#by Michael Rybak

url = r"http://forum.olymp.vinnica.ua/"
browser = r"C:\Program Files\Internet Explorer\iexplore.exe"
delay_millisec = 5000

import urllib, re, os, time

print "\n\nPress ctrl-break any time to exit\n\n"

count = 0
while 1:

    print "\n\nRefresh id:", count

    print "Getting data from %s ..." % url
    try:
        s = urllib.urlopen(url).read()
        opened_url = True    
    except:
        print "Can't open URL"
        opened_url = False    
        
    if opened_url:
        print "Parsing ..."
        pieces = "(?:.*?<td class=\"tc3\">(\\d*)<)?" * 50
        r = re.compile(".*blocktable" + pieces + ".*</table>", re.DOTALL)
        cur_lines = list(r.search(s).groups())
        for i in range(len(cur_lines)):
            if (not cur_lines[i]):
                del cur_lines[i:]
                break

        print "Comparing with latest ..."
        try:
            prev_lines = file("status.dat", "r").read()
        except:
            prev_lines = ""
            
        if ("\n".join(cur_lines) == prev_lines):
            print "No new messages"
        else:
            print "New messages found!"
            print "Saving status ..."
            file("status.dat", "w").write("\n".join(cur_lines))
            print "Loading page ..."                
            os.spawnl(os.P_NOWAIT, browser, os.path.split(browser)[1], url)

    count += 1
    time.sleep(delay_millisec / 1000.0)

#end