Available and used space in a folder (Python)

gistfile1.py

import math

def convertSize(size):
   size_name = ("B","KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB")
   i = int(math.floor(math.log(size,1024)))
   p = math.pow(1024,i)
   s = round(size/p,2)
   if (s > 0):
       return '%s %s' % (s,size_name[i])
   else:
       return '0B'
   
import os

f = os.statvfs("/srv/storage_volumes/data01")

total = f.f_frsize*f.f_blocks
free = f.f_frsize*f.f_bfree
available = f.f_frsize*f.f_bavail

used = total - free
usedperc = float(used) / total

print "Total: " + convertSize(total)
print "Available: " + convertSize(available)
print "%% Used: %.2f%%" % (usedperc*100)