(self, *dict_like_list)
| 373 | """ |
| 374 | |
| 375 | def __init__(self, *dict_like_list): |
| 376 | self._dict_like_list = dict_like_list |
| 377 | self._keys = set() |
| 378 | for obj in dict_like_list: |
| 379 | self._keys.update(obj.keys()) |
| 380 | |
| 381 | def keys(self): |
| 382 | return self._keys |