code: def _format_callback_source(func, args):
      func_repr = _format_callback(func, args, None)
      source = _get_function_source(func)
      if source:
          func_repr += f" at {source[0]}:{source[1]}"
      return func_repr
  
file_path: cpython/Lib/asyncio/format_helpers.py
imports: import functools
  import inspect
  import reprlib
  import sys
  import traceback
  from .None import constants
label_desc: Use image node_id 2 for calling a global function with example usage: _format_callback_source(func, args) and returns: func_repr