code: def fetch_by_code(self, code):
          
          auth_code_data = self.fetchone(self.fetch_code_query, code)
  
          if auth_code_data is None:
              raise AuthCodeNotFound
  
          data = dict()
          data_result = self.fetchall(self.fetch_data_query, auth_code_data[0])
          if data_result is not None:
              for dataset in data_result:
                  data[dataset[0]] = dataset[1]
  
          scopes = []
          scope_result = self.fetchall(self.fetch_scopes_query,
                                       auth_code_data[0])
          if scope_result is not None:
              for scope_set in scope_result:
                  scopes.append(scope_set[0])
  
          return AuthorizationCode(client_id=auth_code_data[1],
                                   code=auth_code_data[2],
                                   expires_at=auth_code_data[3],
                                   redirect_uri=auth_code_data[4],
                                   scopes=scopes, data=data,
                                   user_id=auth_code_data[5])
docs: Retrieves an auth code by its code.
  
          :param code: The code of an auth code.
  
          :return: An instance of :class:`oauth2.datatype.AuthorizationCode`.
  
          :raises: :class:`oauth2.error.AuthCodeNotFound` if no auth code could
                   be retrieved.