blocks2sizes.py

#!/usr/bin/env python3
# -*- coding: UTF-8 -*-

import sys
from math import log

def size2number(blocks):
    number = int(blocks) * 512  # bytes
    if number == 0:
        return 'empty'

    magnitude = int(log(number, 2)) // 10
    default = lambda x: '%dTiB' % (x // 1024 ** 3)
    return {
        0: lambda x: '%d' % x,
        1: lambda x: '%dKiB' % (x // 1024 ** 1),
        2: lambda x: '%dMiB' % (x // 1024 ** 2),
        3: lambda x: '%dGiB' % (x // 1024 ** 3),
    }.get(magnitude, default)(number)


for line in sys.stdin:
    size, rest = line.split(None, 1)
    print(size2number(size), rest, sep='\t', end='')