parameters: (self)
docstring: If `self._last_version` is outdated, then this should update
          the version and `self._bindings2`.
docstring_summary: If `self._last_version` is outdated, then this should update
          the version and `self._bindings2`.
docstring_tokens: If self . _last_version is outdated then this should update the version and self . _bindings2 .
function: def _update_cache(self) -> None:
          """
          If `self._last_version` is outdated, then this should update
          the version and `self._bindings2`.
          """
          raise NotImplementedError
function_tokens: def _update_cache ( self ) -> None : raise NotImplementedError