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