def previous_and_next()

in _tools/createdatadocs.py [0:0]

• 5 lines of code
• 1 McCabe index (conditional complexity)

def previous_and_next(some_iterable):
    prevs, items, nexts = tee(some_iterable, 3)
    prevs = chain([None], prevs)
    nexts = chain(islice(nexts, 1, None), [None])
    return zip(prevs, items, nexts)