code: def _get_user_data(self):
          
  
          url = self.session.host + '/sessions/' + str(self.session.id) + '/visualizations/' + str(self.id) + '/settings/'
          r = requests.get(url)
          if r.status_code == 200:
              content = r.json()
          else:
              raise Exception('Error retrieving user data from server')
  
          return content
docs: Base method for retrieving user data from a viz.