xpath爬取新浪天气

参考资料：

http://cuiqingcai.com/1052.html

http://cuiqingcai.com/2621.html

http://www.cnblogs.com/jixin/p/5131040.html

完整代码：

 # -*- coding:utf-8 -*-
 import urllib2
 from lxml import etree
 user_agent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.221 Safari/537.36 SE 2.X MetaSr 1.0"
 headers = {'User-Agent':user_agent}
 url = 'http://weather.sina.com.cn/'
 user_input = raw_input("请输入你想查询天气的城市的拼音，如beijing\n")
 # print user_input
 url = url+user_input
 # print url
 req = urllib2.Request(url,headers=headers)
 reponse = urllib2.urlopen(req)
 text = reponse.read()
 # print html
 # print type(text)
 html = etree.HTML(text)
 # print html
 # result = etree.tostring(html)
 # print result
 # 有时候当天天气信息的icons和times数据只有19条，分开处理
 def change_list(lis):
     new_lis = []
     if len(lis) == 19:
         if lis == icons:
             new_lis.append(lis[0])
             for i in range(1,19,2):
                 new_lis.append(lis[i]+u'转'+lis[i+1])
         elif lis == times:
             new_lis.append(lis[0].text)
             for i in range(1, 19, 2):
                 new_lis.append(lis[i].text + u'到' + lis[i + 1].text)
     elif len(lis) == 20:
         if lis == icons:
             for i in range(20,2):
                 new_lis.append(lis[i]+u'转'+lis[i+1])
         elif lis == times:
             for i in range(20,2):
                 new_lis.append(lis[i].text + u'到' + lis[i + 1].text)
     return new_lis
 note1 = html.xpath('//*[@class="wt_tt0_note"]')
 note2 = html.xpath('//*[@class="wt_tt0_note"]/..')
 # print note[0].text
 dates = html.xpath('//*[@class="wt_fc_c0_i_date"]')
 days = html.xpath('//*[@class="wt_fc_c0_i_date"]/following-sibling::*[1]')
 icons = html.xpath('//*[@class="wt_fc_c0_i_icons clearfix"]/img/@alt')
 # print len(icons)
 icons = change_list(icons)
 times = html.xpath('//*[@class="wt_fc_c0_i_times"]/span')
 times = change_list(times)
 temps = html.xpath('//*[@class="wt_fc_c0_i_temp"]')
 tips = html.xpath('//*[@class="wt_fc_c0_i_tip"]')
 ls = html.xpath('//*[@class="l"]')
 rs = html.xpath('//*[@class="r"]')
 print note1[0].text,note2[0].text
 # print len(ls),len(rs)
 # PM2.5和空气质量只有7条数据
 for i in range(7):
     print dates[i].text, days[i].text, times[i], icons[i], temps[i].text, tips[i].text, u'PM2.5:'+ls[i].text, u'空气质量:'+rs[i].text
 for i in range(7,10):
     print dates[i].text, days[i].text, times[i], icons[i], temps[i].text, tips[i].text