def METHOD_NAME(size_bytes):
    if not size_bytes:
        return "N/A"
    size_unit = ("B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB")
    i = int(math.floor(math.log(size_bytes, 1024)))
    p = math.pow(1024, i)
    size = round(size_bytes / p, 2)
    return "{}{}".format(size, size_unit[i])