python搭建微信公众平台

# -*- coding: utf-8 -*-
import hashlib
import web
import lxml
import time
import os
import urllib2,json
import urllib
import re
import random
import hashlib
import cookielib
from urllib import urlencode
from lxml import etree
 
class WeixinInterface:
 
  def __init__(self):
    self.app_root = os.path.dirname(__file__)
    self.templates_root = os.path.join(self.app_root, 'templates')
    self.render = web.template.render(self.templates_root)
     
 
  def GET(self):
    #获取输入参数
    data = web.input()
    signature=data.signature
    timestamp=data.timestamp
    nonce=data.nonce
    echostr=data.echostr
    #自己的token
    token="weixin9047" #这里改写你在微信公众平台里输入的token
    #字典序排序
    list=[token,timestamp,nonce]
    list.sort()
    sha1=hashlib.sha1()
    map(sha1.update,list)
    hashcode=sha1.hexdigest()
    #sha1加密算法    
    #如果是来自微信的请求，则回复echostr
    if hashcode == signature:
      return echostr
     
 
     
  def POST(self):    
    str_xml = web.data() #获得post来的数据
    xml = etree.fromstring(str_xml)#进行XML解析
    content=xml.find("Content").text#获得用户所输入的内容
    msgType=xml.find("MsgType").text
    fromUser=xml.find("FromUserName").text
    toUser=xml.find("ToUserName").text
    if(content == u"天气"):
      url = "http://m.ip138.com/21/nanjing/tianqi/"
      headers = {
        'Connection': 'Keep-Alive',
        'Accept': 'text/html, application/xhtml+xml, */*',
        'Accept-Language': 'en-US,en;q=0.8,zh-Hans-CN;q=0.5,zh-Hans;q=0.3',
        'User-Agent': 'Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko'}
      req = urllib2.Request(url, headers = headers)
      opener = urllib2.urlopen(req)
      html = opener.read()
      rex = r'(?<=img src="//m.sbmmt.com/m/image/s[0-9].gif" alt=").{1,6}(?=" />)'
      rexx = r'(?<=div class="temperature">).{5,15}(?=