def humanize_bytes(bytesize, precision=2):
    """
    Humanize byte size figures
    https://gist.github.com/moird/3684595
    """
    abbrevs = (
        (1 << 50, 'PB'),
        (1 << 40, 'TB'),
        (1 << 30, 'GB'),
        (1 << 20, 'MB'),
        (1 << 10, 'kB'),
        (1, 'bytes')
    )
    if bytesize == 1:
        return '1 byte'
    factor, suffix = 1, "bytes"
    for factor, suffix in abbrevs:
        if bytesize >= factor:
            break
    if factor == 1:
        precision = 0
    return '%.*f %s' % (precision, bytesize / float(factor), suffix)