code: def _caller(depth=2):
      try:
          return sys._getframe(depth).f_globals.get(
              "__name__", "__main__"
          )
      except (
          AttributeError,
          ValueError,
      ):  # For platforms without _getframe()
          return None
  
imports: import abc
  import collections
  import collections.abc
  import functools
  import inspect
  import operator
  import sys
  import types
  import typing
  import warnings
label_desc: Use image node_id 5 for calling a global function with example usage: _caller(depth) and returns: sys, None