 #coding:utf-8
 user_agents=['Mozilla/5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko/20130406 Firefox/23.0',
   'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0',
   'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533+ \(KHTML, like Gecko) Element Browser 5.0',
   'IBM WebExplorer /v0.94', 'Galaxy/1.0 [en] (Mac OS X 10.5.6; U; en)',
   'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)',
   'Opera/9.80 (Windows NT 6.0) Presto/2.12.388 Version/12.14',
   'Mozilla/5.0 (iPad; CPU OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) \Version/6.0 Mobile/10A5355d Safari/8536.25',
   'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) \Chrome/28.0.1468.0 Safari/537.36',
   'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.0; Trident/5.0; TheWorld)']