## Parâmetros opcionais

Da mesma forma, você pode declarar parâmetros de consulta opcionais, definindo o valor padrão para `None`:

{* ../../docs_src/query_params/tutorial002_py310.py hl[7] *}

Nesse caso, o parâmetro da função `q` será opcional, e `None` será o padrão.

/// check | Verificar

		skip, record bool
	)

	for s.Scan() {
		line := s.Text()
		switch {
		case skip && line != "":
		case skip && line == "":
			skip = false
		case record && line == "":
			stackTrace := bf.String()
			reset()
			record = false
			if searchRE == nil || searchRE.MatchString(stackTrace) {
				ret[t] = append(ret[t], stackTrace)
			}
		case record:
			save(line)
		default:
			z := goroutinesRE.FindStringSubmatch(line)

/// tip | Dica

**GraphQL** resolve alguns casos de uso muito específicos.

Ele tem **vantagens** e **desvantagens** quando comparado a **web APIs** comuns.

Certifique-se de avaliar se os **benefícios** para o seu caso de uso compensam as **desvantagens**. 🤓

///

## Bibliotecas GraphQL

Aqui estão algumas das bibliotecas **GraphQL** que têm suporte **ASGI**. Você pode usá-las com **FastAPI**:

            sids[si].type = rpc.names.names[si].sid_type;
            sids[si].domainName = null;

            switch (sids[si].type) {
            case SID_TYPE_USER:
            case SID_TYPE_DOM_GRP:
            case SID_TYPE_DOMAIN:
            case SID_TYPE_ALIAS:
            case SID_TYPE_WKN_GRP:
                final int sid_index = rpc.names.names[si].sid_index;

        assertEquals(1, dataMap.size());
        assertEquals("Z1", dataMap.get("z"));
    }

    /** Case 5: Overwrite processing for multiple fields, existing overwrite keys are also properly removed */
    public void test_mergeResponseData_multipleOverwrite() {
        Map<String, Object> dataMap = new HashMap<>();
        // Case where the initial dataMap also contains overwrite keys
        dataMap.put("m", "M0");

func (m *metacache) worthKeeping() bool {
	if m == nil {
		return false
	}
	cache := m
	switch {
	case !cache.finished() && time.Since(cache.lastUpdate) > metacacheMaxRunningAge:
		// Not finished and update for metacacheMaxRunningAge, discard it.
		return false
	case cache.finished() && time.Since(cache.lastHandout) > 5*metacacheMaxClientWait:
		// Keep for 15 minutes after we last saw the client.

}

func objectErrToDriveState(reason error) string {
	switch {
	case reason == nil:
		return madmin.DriveStateOk
	case IsErr(reason, errDiskNotFound):
		return madmin.DriveStateOffline
	case IsErr(reason, errFileNotFound, errFileVersionNotFound, errVolumeNotFound, errPartMissing, errOutdatedXLMeta, errLegacyXLMeta):
		return madmin.DriveStateMissing
	case IsErr(reason, errFileCorrupt, errPartCorrupt):
		return madmin.DriveStateCorrupt

    /**
     * Specifies that this parameter cannot be configured directly by the user (as in the case of POM-specified
     * configuration). This is useful when you want to force the user to use common POM elements rather than plugin
     * configurations, as in the case where you want to use the artifact's final name as a parameter. In this case, you

			}
			_, statErr := obj.GetObjectInfo(ctx, bucketName, objectName, ObjectOptions{
				VersionID: names[i].VersionID,
			})
			switch statErr.(type) {
			case VersionNotFound:
			default:
				t.Errorf("Test %d: Object %s is not removed", testIdx, objectName)
			}
		}
	}
}

func TestDeleteObjectsVersioned(t *testing.T) {

            switch (tagged.getTagNo()) {
            case 0:
                ASN1Integer pvno = ASN1Util.as(ASN1Integer.class, tagged);
                if (!pvno.getValue().equals(new BigInteger(KerberosConstants.KERBEROS_VERSION))) {
                    throw new PACDecodingException("Invalid kerberos version");
                }
                break;
            case 1: