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Iterators of prev/curr/next
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| import itertools | |
| def prevnext(it): | |
| prev, curr, next = itertools.tee(it, 3) | |
| prev = itertools.chain([None], prev) | |
| next = itertools.islice(next, 1, None) | |
| return itertools.izip_longest(prev, curr, next) | |
| def prevnext(it): | |
| it = iter(it) | |
| prev = None | |
| item = it.next() | |
| for next in it: | |
| yield (prev, item, next) | |
| prev = item | |
| item = next | |
| yield (prev, item, None) |
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