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 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) - 1return ('%.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()