code: def suspend_to_bg(event):
      """Suspend to background"""
      event.app.suspend_to_background()
  
imports: import os
  import signal
  import sys
  import warnings
  from dataclasses import dataclass
  from typing import Callable, Any, Optional, List
  from prompt_toolkit.application.current import get_app
  from prompt_toolkit.key_binding import KeyBindings
  from prompt_toolkit.key_binding.key_processor import KeyPressEvent
  from prompt_toolkit.key_binding.bindings import named_commands
  from prompt_toolkit.key_binding.bindings.completion import display_completions_like_readline
  from prompt_toolkit.key_binding.vi_state import InputMode, ViState
  from prompt_toolkit.filters import Condition
  from IPython.core.getipython import get_ipython
  from IPython.terminal.shortcuts import auto_match
  from IPython.terminal.shortcuts import auto_suggest
  from IPython.terminal.shortcuts.filters import filter_from_string
  from IPython.utils.decorators import undoc
  from prompt_toolkit.enums import DEFAULT_BUFFER
label_desc: Use image node_id 13 for calling a global function with example usage: suspend_to_bg(event) without return types