code: def run(self):
      print(self.counter)
  
file_path: pytorch-lightning/examples/app/justpy/app.py
imports: from typing import Callable
  from lightning import LightningApp, LightningFlow
  from lightning.app.frontend import JustPyFrontend
label_desc: Use image node_id 2 for calling the Flow obj's underlying member method code with example usage: obj.run() without return types