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 mathdef convertBytes(bytes, lst=None):    if lst is None:        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=lst)if __name__ == '__main__':    main()