Python:文件操作中的字节转换

#!/usr/bin/envpython

#-*-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)

))

ifi>=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()