$ apt-get install lxml-python
$ pip install beautifulsoup4

# -*- coding: utf-8 -*-

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

try:
    # Python 3
    from urllib import request
except ImportError:
    # Python 2
    import urllib2 as request

from bs4 import BeautifulSoup
import codecs
import time

def getSoup(url):
    response = request.urlopen(url)
    body = response.read()
    # Parse HTML
    return BeautifulSoup(body, 'lxml')

wait_sec = 3
domain = 'http://hoge.com'
result_file = 'list.txt'
i = 1
while(True):
    url = '{domain}/{index:0>2}/'.format(domain = domain, index = i)
    try:
        soup = getSoup(url)
    except IOError:
        break

    div = soup.find('div', attrs = {'id': 'div_id'})
    all_a = div.find_all('a', attrs = {'class': 'a_class'})
    src_list = []
    for a in all_a:
        src_list.append(a.img['src'])
    with codecs.open(result_file, 'a', 'utf-8') as f:
        f.write('\n'.join(src_list))
    print(i)
    i += 1

    time.sleep(wait_sec)