Python 之字节转换

 1 # coding: utf-8
 2 
 3 def bytes2human(n):
 4     """
 5     >>> bytes2human(10000)
 6     9K
 7     >>> bytes2human(100001221)
 8     95M
 9     """
10     symbols = (‘K‘, ‘M‘, ‘G‘, ‘T‘, ‘P‘, ‘E‘, ‘Z‘, ‘Y‘)
11     prefix     = {}
12     for i, s in enumerate(symbols):
13         prefix[s] = 1 << (i+1)*10
14     
15     for s in reversed(symbols):
16         if n >= prefix[s]:
17             value = int(float(n)/prefix[s])
18             return ‘%s%s‘ % (value, s)
19     return ‘%sB‘ % n