class_docstr: When no :class:`.Application` is running,
  :func:`.get_app` will run an instance of this :class:`.DummyApplication` instead.
code: def suspend_to_background(self, suspend_group: bool = True) -> None:
      raise NotImplementedError
  
file_path: catboost/contrib/python/prompt-toolkit/py3/prompt_toolkit/application/dummy.py
imports: from __future__ import annotations
  from typing import Callable
  from prompt_toolkit.eventloop import InputHook
  from prompt_toolkit.formatted_text import AnyFormattedText
  from prompt_toolkit.input import DummyInput
  from prompt_toolkit.output import DummyOutput
  from .application import Application
label_desc: Use image node_id 3 for calling the DummyApplication obj's underlying member method code with example usage: obj.suspend_to_background(suspend_group) without return types