| 357 | |
| 358 | |
| 359 | class _OrderedChainMap(collections.ChainMap): |
| 360 | def __iter__(self): |
| 361 | seen = set() |
| 362 | for mapping in self.maps: |
| 363 | for k in mapping: |
| 364 | if k not in seen: |
| 365 | seen.add(k) |
| 366 | yield k |
| 367 | |
| 368 | |
| 369 | class TestCase(object): |
no outgoing calls
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