code: def get_default_partition_num(self):
      if self._default_partition_num is None:
          return super().get_default_partition_num()
      else:
          return self._default_partition_num
  
imports: import json
  import logging
  import sys
  import typing
  from typing import List
  from fate.arch.computing.api import KVTableContext
  from fate.arch.federation.api import Federation, PartyMeta, TableMeta
  from ._datastream import Datastream
  from ._parties import Party
label_desc: Use image node_id 7 for calling the MessageQueueBasedFederation obj's underlying member method code with example usage: obj.get_default_partition_num() and returns: super, self