转换 bytes 为 kb/mb/gb/tb/pb...

智能转换 bytes 为 kb/mb/gb/tb/pb...

用到了 math 模块中的一些函数

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""智能转换 bytes 为 kb/mb/gb/tb/pb...
"""

import math

def convertBytes(bytes, lst=[\'Bytes\', \'KB\', \'MB\', \'GB\', \'TB\', \'PB\']):
    i = int(math.floor( # 舍弃小数点，取小
             math.log(bytes, 1024) # 求对数(对数：若 a**b = N 则 b 叫做以 a 为底 N 的对数)
            ))

    if i >= len(lst):
        i = len(lst) - 1
    return (\'%.2f\' + " " + lst[i]) % (bytes/math.pow(1024, i))

def main():
    lst = [\'Bytes\', \'KB\', \'MB\', \'GB\', \'TB\', \'PB\']
    bytes = input(\'Bytes: \')
    print convertBytes(bytes, lst)

if __name__ == \'__main__\':
    main()