code: def contains(self, key: Union[str, Enum]) -> bool:
      str_key: str = self._key_to_str(key)
      return str_key in self._dict and self.get(str_key) is not None
  
imports: from enum import Enum
  from typing import Union, Callable, Any, Dict, Optional, Type, List, Generic, TypeVar
label_desc: Use image node_id 2 for calling the FluentDict obj's underlying member method code with example usage: obj.contains(key) and returns: unknown