@classmethod<EOL><INDENT>@utils.positional(<NUM_LIT:3>)<EOL>def _get_by_id(cls, id, parent=None, **ctx_options):<DEDENT>
return cls._get_by_id_async(id, parent=parent, **ctx_options).get_result()<EOL>
Returns an instance of Model class by ID.

        This is really just a shorthand for Key(cls, id, ...).get().

        Args:
          id: A string or integer key ID.
          parent: Optional parent key of the model to get.
          namespace: Optional namespace.
          app: Optional app ID.
          **ctx_options: Context options.

        Returns:
          A model instance or None if not found.