<爬虫>黑板爬虫闯关02

import requests
from lxml import etree
'''
	黑板爬虫闯关02
	网址:http://www.heibanke.com/lesson/crawler_ex01/
'''

url = "http://www.heibanke.com/lesson/crawler_ex01/"
data = {
	'username':"shuimo",
	'password': 0,
}
for i in range(30):
	data['password'] = i
	res = requests.post(url,data=data)
	res.encoding="utf8"
	html = etree.HTML(res.content)
	info = html.xpath("//h3/text()")[0][4:8]
	if info != "密码错误":
		url = "http://www.heibanke.com" + str(html.xpath('//a[@class="btn btn-primary"]/@href')[0])
		print("下一关的网址是:%s"%url)
		print("闯关成功的数字是%d"%i)
		break