code: def _deprecated_getitem_method(name, attrs):
      
      attrs = frozenset(attrs)
      msg = (
          "'{name}[{attr!r}]' is deprecated, please use"
          " '{name}.{attr}' instead"
      )
  
      def __getitem__(self, key):
          """``__getitem__`` is deprecated, please use attribute access instead.
          """
          warn(msg.format(name=name, attr=key), DeprecationWarning, stacklevel=2)
          if key in attrs:
              return self.__dict__[key]
          raise KeyError(key)
  
      return __getitem__
docs: Create a deprecated ``__getitem__`` method that tells users to use
      getattr instead.
  
      Parameters
      ----------
      name : str
          The name of the object in the warning message.
      attrs : iterable[str]
          The set of allowed attributes.
  
      Returns
      -------
      __getitem__ : callable[any, str]
          The ``__getitem__`` method to put in the class dict.