How to use the validators.ipv6 function in validators

def test_returns_true_on_valid_ipv6_address(address):
    assert ipv6(address)
    assert not ipv4(address)

def test_returns_true_on_valid_ipv4_address(address):
    assert ipv4(address)
    assert not ipv6(address)

def getAnonymizedIpOrDomain(value):
    if validators.ipv4(value) or validators.ipv6(value):
        return "" % hashlib.md5(value).hexdigest()
    elif validators.domain(value):
        return "" % hashlib.md5(value).hexdigest()
    else:
        return "" % hashlib.md5(value).hexdigest()

def read_iocs(cb, file=sys.stdin):
    iocs = defaultdict(list)
    report_id = hashlib.md5()
    report_id.update(str(time.time()).encode("utf-8"))

    for idx, line in enumerate(sys.stdin):
        line = line.rstrip("\r\n")
        report_id.update(line.encode("utf-8"))
        if validators.md5(line):
            iocs["md5"].append(line)
        elif validators.sha256(line):
            eprint("line {}: sha256 provided but not yet supported by backend".format(idx + 1))
            iocs["sha256"].append(line)
        elif validators.ipv4(line):
            iocs["ipv4"].append(line)
        elif validators.ipv6(line):
            iocs["ipv6"].append(line)
        elif validators.domain(line):
            iocs["dns"].append(line)
        else:
            if cb.validate_query(line):
                query_ioc = {"search_query": line}
                iocs["query"].append(query_ioc)
            else:
                eprint("line {}: invalid query".format(idx + 1))

    return (report_id.hexdigest(), dict(iocs))
#

return None
        elif argument[0] is '#':
            return None
        elif validators.url(argument):
            return "URL"
        elif validators.md5(argument):
            return "MD5"
        elif validators.sha1(argument):
            return "SHA1"
        elif validators.sha256(argument):
            return "SHA256"
        elif validators.sha512(argument):
            return "SHA512"
        elif validators.ipv4(argument):
            return "IPv4"
        elif validators.ipv6(argument):
            return "IPv6"
        elif validators.domain(argument):
            return "domain"
        else:
            return None