code: def show_user(self, user):
          
  
          url = '/users/show/%s.xml' % (user)
          d = defer.Deferred()
  
          self.__downloadPage(url, txml.Users(lambda u: d.callback(u))) \
              .addErrback(lambda e: d.errback(e))
  
          return d
docs: Get the info for a specific user.
  
          Returns a delegate that will receive the user in a callback.