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August 29, 2015 14:03
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def neighborhood(self, iterable): | |
iterator = iter(iterable) | |
prev = None | |
item = iterator.next() # throws StopIteration if empty. | |
for next in iterator: | |
yield (prev,item,next) | |
prev = item | |
item = next | |
yield (prev,item,None) |
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