Convert file/memory size of int number to human readable format.

human_size.py

"""
From: http://stackoverflow.com/a/1094933/1925083
Supports:

all currently known binary prefixes
negative and positive numbers
numbers larger than 1000 Yobibytes
arbitrary units (maybe you like to count in Gibibits!)
Example:

>>> sizeof_fmt(168963795964)
'157.4GiB'

"""
def sizeof_fmt(num, suffix='B'):
    for unit in ['','Ki','Mi','Gi','Ti','Pi','Ei','Zi']:
        if abs(num) < 1024.0:
            return "%3.1f%s%s" % (num, unit, suffix)
        num /= 1024.0
    return "%.1f%s%s" % (num, 'Yi', suffix)