新版新浪微博模拟登陆请看：http://blog.csdn.net/monsion/article/details/8656690

本文后面的解决动态加载的程序依然有效

重新编辑了一次，出了点儿问题

第一个模块，模拟登陆sina微博，创建weiboLogin.py文件，输入以下代码：

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

import sys
import urllib
import urllib2
import cookielib
import base64
import re
import json
import hashlib

class weiboLogin:
	cj = cookielib.LWPCookieJar()
	cookie_support = urllib2.HTTPCookieProcessor(cj)
	opener = urllib2.build_opener(cookie_support, urllib2.HTTPHandler)
	urllib2.install_opener(opener)
	postdata = {
		'entry': 'weibo',
		'gateway': '1',
		'from': '',
		'savestate': '7',
		'userticket': '1',
		'ssosimplelogin': '1',
		'vsnf': '1',
		'vsnval': '',
		'su': '',
		'service': 'miniblog',
		'servertime': '',
		'nonce': '',
		'pwencode': 'wsse',
		'sp': '',
		'encoding': 'UTF-8',
		'url': 'http://weibo.com/ajaxlogin.php?framelogin=1&callback=parent.sinaSSOController.feedBackUrlCallBack',
		'returntype': 'META'
	}

	def get_servertime(self):
		url = 'http://login.sina.com.cn/sso/prelogin.php?entry=weibo&callback=sinaSSOController.preloginCallBack&su=dW5kZWZpbmVk&client=ssologin.js(v1.3.18)&_=1329806375939'
		data = urllib2.urlopen(url).read()
		p = re.compile('\((.*)\)')
		try:
			json_data = p.search(data).group(1)
			data = json.loads(json_data)
			servertime = str(data['servertime'])
			nonce = data['nonce']
			return servertime, nonce
		except:
			print 'Get severtime error!'
			return None

	def get_pwd(self, pwd, servertime, nonce):
		pwd1 = hashlib.sha1(pwd).hexdigest()
		pwd2 = hashlib.sha1(pwd1).hexdigest()
		pwd3_ = pwd2 + servertime + nonce
		pwd3 = hashlib.sha1(pwd3_).hexdigest()
		return pwd3

	def get_user(self, username):
		username_ = urllib.quote(username)
		username = base64.encodestring(username_)[:-1]
		return username


	def login(self,username,pwd):
		url = 'http://login.sina.com.cn/sso/login.php?client=ssologin.js(v1.3.18)'
		try:
			servertime, nonce = self.get_servertime()
		except:
			print 'get servertime error!'
			return
		weiboLogin.postdata['servertime'] = servertime
		weiboLogin.postdata['nonce'] = nonce
		weiboLogin.postdata['su'] = self.get_user(username)
		weiboLogin.postdata['sp'] = self.get_pwd(pwd, servertime, nonce)
		weiboLogin.postdata = urllib.urlencode(weiboLogin.postdata)
		headers = {'User-Agent':'Mozilla/5.0 (X11; Linux i686; rv:8.0) Gecko/20100101 Firefox/8.0 Chrome/20.0.1132.57 Safari/536.11'}
		req  = urllib2.Request(
			url = url,
			data = weiboLogin.postdata,
			headers = headers
		)
		result = urllib2.urlopen(req)
		text = result.read()
		p = re.compile('location\.replace\(\'(.*?)\'\)')
		try:
			login_url = p.search(text).group(1)
			urllib2.urlopen(login_url)
			print "Login success!"
		except:
			print 'Login error!'

然后创建main.py文件，输入以下代码：

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

import weiboLogin
import urllib
import urllib2

username = '你的微博用户名'
pwd = '你的微博密码'

WBLogin = weiboLogin.weiboLogin()
WBLogin.login(username, pwd)

注意：若登陆失败，可能是你的账号在登陆的时候需要输入验证码！你在网页上登陆你的账号试试看，在账号设置里面可以设置某些地区不输入验证码。

参考：http://www.douban.com/note/201767245/

接下来，考虑实现抓取微博的内容。

此时遇到一个困难，当抓取指定URL的微博时，初始显示只有15条。后面的是延迟显示的（ajax里面叫lazy load?）。也就是说，当滚动条第一次拖到最下面的时候，会显示第二部分，再拖到最下面，会显示第三部分。此时一个页面的微博才是完整的。所以，要获取一个微博页面的全部微博，需要访问这个页面三次。创建getWeiboPage.py文件，相应代码如下：

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

import urllib
import urllib2
import sys
import time

reload(sys)
sys.setdefaultencoding('utf-8')

class getWeiboPage:
	body = {
		'__rnd':'',
		'_k':'',
		'_t':'0',
		'count':'50',
		'end_id':'',
		'max_id':'',
		'page':1,
		'pagebar':'',
		'pre_page':'0',
		'uid':''
	}
	uid_list = []
	charset = 'utf8'

	def get_msg(self,uid):
		getWeiboPage.body['uid'] = uid
		url = self.get_url(uid)
		self.get_firstpage(url)
		self.get_secondpage(url)
		self.get_thirdpage(url)
	def get_firstpage(self,url):
		getWeiboPage.body['pre_page'] = getWeiboPage.body['page']-1
		url = url +urllib.urlencode(getWeiboPage.body)
		req = urllib2.Request(url)
		result = urllib2.urlopen(req)
		text = result.read()
		self.writefile('./output/text1',text)		
		self.writefile('./output/result1',eval("u'''"+text+"'''"))
		
	def get_secondpage(self,url):
		getWeiboPage.body['count'] = '15'
	#	getWeiboPage.body['end_id'] = '3490160379905732'
	#	getWeiboPage.body['max_id'] = '3487344294660278'
		getWeiboPage.body['pagebar'] = '0'
		getWeiboPage.body['pre_page'] = getWeiboPage.body['page']

		url = url +urllib.urlencode(getWeiboPage.body)
		req = urllib2.Request(url)
		result = urllib2.urlopen(req)
		text = result.read()
		self.writefile('./output/text2',text)		
		self.writefile('./output/result2',eval("u'''"+text+"'''"))
	def get_thirdpage(self,url):
		getWeiboPage.body['count'] = '15'
		getWeiboPage.body['pagebar'] = '1'
		getWeiboPage.body['pre_page'] = getWeiboPage.body['page']

		url = url +urllib.urlencode(getWeiboPage.body)
		req = urllib2.Request(url)
		result = urllib2.urlopen(req)
		text = result.read()
		self.writefile('./output/text3',text)		
		self.writefile('./output/result3',eval("u'''"+text+"'''"))
	def get_url(self,uid):
		url = 'http://weibo.com/' + uid + '?from=otherprofile&wvr=3.6&loc=tagweibo'
		return url
	def get_uid(self,filename):
		fread = file(filename)
		for line in fread:
			getWeiboPage.uid_list.append(line)
			print line
			time.sleep(1)
	def writefile(self,filename,content):
		fw = file(filename,'w')
		fw.write(content)
		fw.close()

在刚刚的main.py中加入相应内容，完整内容为：

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

import weiboLogin
import getWeiboMsg
import urllib
import urllib2

username = '你的微博用户名'
pwd = '你的微博密码'

WBLogin = weiboLogin.weiboLogin()
WBLogin.login(username, pwd)

WBmsg = getWeiboMsg.getWeiboMsg()
url = 'http://weibo.com/1624087025?from=otherprofile&wvr=3.6&loc=tagweibo'

WBmsg.get_firstpage(url)
WBmsg.get_secondpage(url)
WBmsg.get_thirdpage(url)

参考：http://www.cnblogs.com/sickboy/archive/2012/01/08/2316248.html
执行python main.py，应该可以运行，结果保存在./output/文件夹中，该文件夹自己提前创建好。
昨天搞了一个下午，很多东西还没弄好，欢迎留言交流。