http://www.pythonchallenge.com...Level4

 

import urllib
import re

def main():

    url = "http://www.pythonchallenge.com/pc/def/linkedlist.php?nothing="
   
    url_to = url + "12345"
    #url_to = url + "46059" # After get new messages.
   
    while 1:
        source = urllib.urlopen(url_to)
        data = source.read()
        number = re.findall("nothing is ([0-9]+)", data)
        if number:
           url_to = url + "".join(number)
           print url_to
        else:
           break
       
    print data
   
   
if __name__ == "__main__":
    main()