[Python]计算豆瓣电影TOP250的平均得分

用python写的爬虫练习，感觉比golang要好写一点。

 import re
 import urllib

 origin_url = 'https://movie.douban.com/top250?start=00&filter='
 urls = []
 scores = []

 def get_url():
     step = 0
     while step <= 250:
         tmp = origin_url[:38]
         tmp += str(step)
         tmp += origin_url[40:]
         urls.append(tmp)
         step += 25

 def get_html(url):
     page = urllib.urlopen(url)
     html = page.read()
     return html

 def get_score(html):
     score = []
     reg = r'property="v:average">([0-9].[0-9])</span>'
     score = re.findall(re.compile(reg), html)
     return score

 def solve():
     get_url()
     for each in urls:
         print each
         scores.append(get_score(get_html(each)))
     sum = 0
     cnt = 0
     for each in scores:
         if cnt == 250: break
         for i in range(0, len(each)):
             if cnt == 250: break
             cnt += 1
             sum += float(each[i])
     return sum / 250

 print solve()