code: def __init__(self, flat_key: str):
      self.flat_key = flat_key
      self.data: dict[t.Any, t.Any] = {}
  
imports: from __future__ import absolute_import
  from __future__ import annotations
  import re
  import sys
  import typing
  from operator import itemgetter
label_desc: Use image node_id 1 to create a new _holder object from inherited base classes: dict with example: obj = _holder(flat_key)