Query xxsy book status

#!/usr/bin/env python
#-*- coding:utf-8 -*-

import sys
import urllib2
import json

Info_URL = 'http://www.xxsy.net//ajax/pAjax.aspx?method=binfo&bookid={0}'

book_url = sys.argv[1]
book_id = book_url.split('/')[-1].replace('.html', '')

data = urllib2.urlopen(Info_URL.format(book_id)).read()
data = json.loads(data)

print 'Book:', data['BookName'], '/', data['AuthorName']
print 'Updated at:', data['Lastupdatetime']
print 'Free:', data['Lastzjname']
print 'VIP:', data['Lastvipzjname']