def human_filesize(nbytes):
    suffixes = ['B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB']
    i = 0
    while nbytes >= 1024 and i < len(suffixes) - 1:
        nbytes /= 1024.
        i += 1
    f = ('%.2f' % nbytes).rstrip('0').rstrip('.')
    return '%s %s' % (f, suffixes[i])