(self, other)
| 324 | return NotImplemented |
| 325 | |
| 326 | def __ror__(self, other): |
| 327 | if isinstance(other, _collections_abc.Mapping): |
| 328 | c = self.__class__() |
| 329 | c.update(other) |
| 330 | c.update(self) |
| 331 | return c |
| 332 | return NotImplemented |
| 333 | |
| 334 | |
| 335 | class KeyedRef(ref): |