def enumerate_reversed(sequence):
    for index in reversed(xrange(len(sequence))):
        yield index, sequence[index]
Looks for all the directories in the S3 bucket cache metadata.
dataset/ETHPy150Open tanghaibao/jcvi/utils/cbook.py/enumerate_reversed--crossover with--dataset/ETHPy150Open saltstack/salt/salt/fileserver/s3fs.py/_find_dirs