code: def __init__(self):
      super().__init__()
      self.var_a = Payload(None)
  
imports: import os
  import pathlib
  import pickle
  from copy import deepcopy
  from unittest import mock
  from unittest.mock import Mock
  import pytest
  from lightning.app import LightningApp, LightningFlow, LightningWork
  from lightning.app.runners.multiprocess import MultiProcessRuntime
  from lightning.app.storage.payload import Payload
  from lightning.app.storage.requests import _GetRequest
label_desc: Use image node_id 1 to create a new Work object from inherited base classes: LightningWork with example: obj = Work()