Python 之字节转换

 # coding: utf-8

 def bytes2human(n):

     """

     >>> bytes2human(10000)

     9K

     >>> bytes2human(100001221)

     95M

     """

     symbols = ('K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y')

     prefix     = {}

     for i, s in enumerate(symbols):

         prefix[s] = 1 << (i+1)*10

     for s in reversed(symbols):

         if n >= prefix[s]:

             value = int(float(n)/prefix[s])

             return '%s%s' % (value, s)

     return '%sB' % n