无法从机械化将html传递给lxml

I'm a total newb, so please forgive me for what is probably really easy. I am using mechanize to login into a pw protected site - which works just fine and returns the html of the post-login page. I am trying to pass that html into lxml to parse some table results. This is not working and instead of parsing with xpath the print txt1 returns all of the html.I'm a total newb, so please forgive me for what