convert a byte count to a human readable form

bytes

#!/usr/bin/env python3

import sys
import math

totalBytes = int(sys.argv[1])
units = ["bytes", "kilobytes", "megabytes", "gigabytes", "terrabytes", "petabytes"]

unitIndex = int(math.log(totalBytes, 1024))
bytesPerUnit = math.pow(1024, unitIndex)
print("%.2f %s" % (totalBytes / (bytesPerUnit + 0.0), units[unitIndex]))