code: def __contains__(self, item):
      return bool(getattr(self, item, False))
  
imports: import dataclasses
  from dataclasses import dataclass, field, make_dataclass
  from pathlib import Path
  from typing import Dict, Iterator, List, NamedTuple, Optional, Tuple, Type, TypeVar, Union
  import pytorch_lightning
  import torch
  from flash.core.serve.types.base import BaseType
  from flash.core.serve.utils import download_file
  from flash.core.utilities.imports import _PYDANTIC_AVAILABLE, requires
label_desc: Use image node_id 3 for calling the DictAttrAccessBase obj's underlying member method code with example usage: obj.__contains__(item) and returns: bool