code: def create(self, client_id, title, unsubscribe_page, confirmed_opt_in,
                 confirmation_success_page, unsubscribe_setting="AllClientLists"):
          
          body = {
              "Title": title,
              "UnsubscribePage": unsubscribe_page,
              "ConfirmedOptIn": confirmed_opt_in,
              "ConfirmationSuccessPage": confirmation_success_page,
              "UnsubscribeSetting": unsubscribe_setting}
          response = self._post("/lists/%s.json" % client_id, json.dumps(body))
          self.list_id = json_to_py(response)
          return self.list_id
docs: Creates a new list for a client.