class_docstr: This class performs the mapping between the objects contained
  in a HDF5 group and Dataset attributes.
class_docstr_tok: ["This","class","performs","the","mapping","between","the","objects","contained","in","a","HDF5","group","and","Dataset","attributes","."]
code: def __contains__(self, key: str) -> bool:
      return key in self._cache or key in self.bind
  
imports: import typing
  from collections.abc import MutableMapping
  from types import MappingProxyType
  from typing import Any, Dict, Optional, Type
  from pennylane.data.base.attribute import AttributeInfo, DatasetAttribute, get_attribute_type, match_obj_type
  from pennylane.data.base.hdf5 import HDF5Any, HDF5Group
label_desc: Use image node_id 10 for calling the AttributeTypeMapper obj's underlying member method code with example usage: obj.__contains__(key) and returns: unknown