利用Python获取ZOJ所有题目的名字

import urllib.request
import re
import dbm
#定义URL，其中%d用于替换页码
url = 'http://acm.zju.edu.cn/onlinejudge/showProblems.do?contestId=1&pageNumber=%d'
#连接持久化字典，这里用创建的方法'c'来创建写入
db = dbm.open('zoj_list', 'c')

for index in range(1, 30):
this_url = url % (index)#替换URL中代表页码的数字
html = urllib.request.urlopen(this_url).read()#read方法读取页面HTML
html = html.decode('utf-8')#UTF-8编码，没有这句会提示错误
title = re.compile('<font color="blue">.*</font>')#正则之，编译之
key = ''
cnt = 1
for x in title.findall(html):
title_parse = re.compile('<[^>]+>')#除去标签的正则
get = title_parse.sub('', x)#除去标签
if cnt % 2 == 0:
value = get
db[key] = value
else:
key = get
cnt += 1

import dbm
db = dbm.open('zoj_list', 'r')
print(db['1001'])
for index in range(1001, 2000):
in_ch = str(index)
print(db[in_ch])