import re import urllib import urllib2 import cookielib import datetimeimport timefrom urllib2 import URLError,HTTPError#第一個參數為日志文件，第二個參數為用戶名，第三個參數為密碼def renren_login(logfile,username,password):  logfile.write(str(datetime.datetime.now()) + ' renren/r/n')  cj = cookielib.CookieJar()  post_data = urllib.urlencode(    {'email':username,     'password':password,    }    )  path = 'http://www.renren.com/PLogin.do'  opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))  urllib2.install_opener(opener)  req = urllib2.Request(path,post_data)    try:    conn = urllib2.urlopen(req)  except URLError,e:    print 'URLError'    logfile.write('URLError:' + str(e.code) + '/r/n')#http://www.renren.com/SysHome.do    return False  except HTTPError,e:      logfile.write('HTTP Error:'+e.reason + '/r/n')    return False  if conn.geturl() == 'http://www.renren.com/home':    print 'success'    logfile.write('Task finished/r/n')    return conn.read()  else:    print 'Task Failed'    logfile.write('Task failed/r/n')# 登錄成功，返回整個頁面的代碼    file_object = open("log.txt",'w')    login_index = renren_login(file_object,'xxxxxx','xxxx')