import urllib.request as ur

import re

url='http://www.heibanke.com/lesson/crawler_ex00/'

pat=re.compile(r'<h3>(\D+(\d+)\D*)</h3>')

num=''

while True:

    newurl=url+num

    req=ur.Request(newurl)

    res=ur.urlopen(req).read().decode('utf-8')

    match=pat.search(res)

    if match:

        html=pat.findall(res)

        num=str(html[0][1])

        print(html[0][0])

    else:

        html=re.findall(r'<h3>(.+)</h3>',res)

        print(html[0])

        break