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in utils.py
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 izip(prevs, items, nexts)for work i use this fonction but they not work well because i use it in this loop
for gallery in dirs:but dirs is not sort by date