Return items in minuend not in subtrahend, retaining order with O(1) lookup.
(minuend, subtrahend)
| 74 | |
| 75 | |
| 76 | def _difference(minuend, subtrahend): |
| 77 | """ |
| 78 | Return items in minuend not in subtrahend, retaining order |
| 79 | with O(1) lookup. |
| 80 | """ |
| 81 | return itertools.filterfalse(set(subtrahend).__contains__, minuend) |
| 82 | |
| 83 | |
| 84 | class InitializedState: |
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