python抓取新浪微博，求教！！?

import smtplib
from email.mime.text import MIMEText
import requests
from lxml import etree
import os
import time
import sys
reload(sys)
sys.setdefaultencoding("utf-8")

class mailhelper(object):
"""
這個類實現發送郵件的功能
"""
def __init__(self):

self.mail_host="smtp.xxxx.com" #設置伺服器
self.mail_user="xxxx" #用戶名
self.mail_pass="xxxx" #密碼
self.mail_postfix="xxxx.com" #發件箱的後綴

def send_mail(self,to_list,sub,content):
me="xxoohelper"+"&<"+self.mail_user+"@"+self.mail_postfix+">"
msg = MIMEText(content,_subtype="plain",_charset="utf-8")
msg["Subject"] = sub
msg["From"] = me
msg["To"] = ";".join(to_list)
try:
server = smtplib.SMTP()
server.connect(self.mail_host)
server.login(self.mail_user,self.mail_pass)
server.sendmail(me, to_list, msg.as_string())
server.close()
return True
except Exception, e:
print str(e)
return False

class xxoohelper(object):
"""
這個類實現將爬取微博第一條內容
"""
def __init__(self):
self.url = "http://weibo.cn/u/xxxxxxx" #請輸入準備抓取的微博地址
self.url_login = "https://login.weibo.cn/login/"
self.new_url = self.url_login

def getSource(self):
html = requests.get(self.url).content
return html

def getData(self,html):
selector = etree.HTML(html)
password = selector.xpath("//input[@type="password"]/@name")[0]
vk = selector.xpath("//input[@name="vk"]/@value")[0]
action = selector.xpath("//form[@method="post"]/@action")[0]
self.new_url = self.url_login + action
data = {
"mobile" : "xxxxx@xxx.com",
password : "xxxxxx",
"remember" : "on",
"backURL" : "http://weibo.cn/u/xxxxxx", #此處請修改為微博地址
"backTitle" : u"微博",
"tryCount" : "",
"vk" : vk,
"submit" : u"登錄"
}
return data

def getContent(self,data):
newhtml = requests.post(self.new_url,data=data).content
new_selector = etree.HTML(newhtml)
content = new_selector.xpath("//span[@class="ctt"]")
newcontent = unicode(content[2].xpath("string(.)")).replace("http://","")
sendtime = new_selector.xpath("//span[@class="ct"]/text()")[0]
sendtext = newcontent + sendtime
return sendtext

def tosave(self,text):
f= open("weibo.txt","a")
f.write(text + "
")
f.close()

def tocheck(self,data):
if not os.path.exists("weibo.txt"):
return True
else:
f = open("weibo.txt", "r")
existweibo = f.readlines()
if data + "
" in existweibo:
return False
else:
return True