how does "store_keypoints"effect?

[reme0220]

   Dear all,
   Sorry to trouble you here. I was making a network matchPhotos with python script. When I add new photos to chunk that already has photos aligned, I expect not  to detect features  again on photos aligned,then I use the attribute "store_keypoints",but it seems not effect.
Does the attribute "store_keypoints"  of Tasks.MatchPhotos() effects the same way as the parameter "keep_keypoints"  in MatchPhotos()  function?

       client = PhotoScan.NetworkClient()
       client.connect(serverIP)
        Task = PhotoScan.Tasks.MatchPhotos()
        Task.preselection_generic = True
        Task.preselection_reference = True
        Task.keypoint_limit = 40000
        Task.tiepoint_limit = 4000
        Task.store_keypoints = True
        Task.network_distribute = True
        task = PhotoScan.NetworkTask()
        task.name = Task.name
        task.params = Task.encode()

        batch_id = self.client.createBatch(self.ps.psx_save_path['test.psx',[task])
        client.resumeBatch(batch_id)