code: def __contains__(self, name: str):
      names = name.split("/", 1)
      if hasattr(self, names[0]):
          if len(names) > 1:
              return names[1] in getattr(self, names[0])
          else:
              return True
      else:
          return False
  
imports: from __future__ import annotations
  import warnings
  import json
  from typing import Dict, Union, Optional
  from collections import OrderedDict
  from .meters import Meter
label_desc: Use image node_id 9 for calling the MeterDict obj's underlying member method code with example usage: obj.__contains__(name) and returns: False, unknown, True