/// tip

This is just standard Python, it's called a "type alias", it's actually not specific to **FastAPI**.

But because **FastAPI** is based on the Python standards, including `Annotated`, you can use this trick in your code. 😎

///

Commençons avec cette application pour exemple :

{* ../../docs_src/query_params_str_validations/tutorial001.py hl[9] *}

Le paramètre de requête `q` a pour type `Union[str, None]` (ou `str | None` en Python 3.10), signifiant qu'il est de type `str` mais pourrait aussi être égal à `None`, et bien sûr, la valeur par défaut est `None`, donc **FastAPI** saura qu'il n'est pas requis.

/// note

                "item_id"
            ],
            "msg": "value is not a valid integer",
            "type": "type_error.integer"
        }
    ]
}
```

você receberá a versão em texto:

```
1 validation error
path -> item_id
  value is not a valid integer (type=type_error.integer)
```

### `RequestValidationError` vs `ValidationError`

/// warning | "Aviso"

//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package parquet

type s3Error struct {
	code       string
	message    string
	statusCode int
	cause      error
}

func (err *s3Error) Cause() error {
	return err.cause
}

func (err *s3Error) ErrorCode() string {

        acceptedApiChanges.acceptedChanges = [:]
        for (String jsonText : jsonTexts) {
            def json = new Gson().fromJson(jsonText, new TypeToken<Map<String, List<AcceptedApiChange>>>() {}.type)
            Map<ApiChange, String> acceptedChanges = json.acceptedApiChanges.collectEntries { jsonChange ->
                [(jsonChange.toApiChange()): jsonChange.acceptation]
            }

			fileContents: `
{
	"cniVersion": "0.3.1",
	"name": "istio-cni",
	"type": "istio-cni"
}`,
		},
		{
			name:            "another regular file",
			dir:             tempDir,
			expectedFailure: false,
			inFilename:      "regular2.conf",
			outFilename:     "regular.conf",
			fileContents: `
{
	"cniVersion": "0.3.1",
	"name": "istio-cni",
	"type": "istio-cni"
}`,
		},
	}

	for _, c := range cases {

@SuppressWarnings ( "javadoc" )
public class MsrpcShareGetInfo extends srvsvc.ShareGetInfo {

    public MsrpcShareGetInfo ( String server, String sharename ) {
        super(server, sharename, 502, new srvsvc.ShareInfo502());
        this.ptype = 0;
        this.flags = DCERPC_FIRST_FRAG | DCERPC_LAST_FRAG;
    }


    public ACE[] getSecurity () throws IOException {
        srvsvc.ShareInfo502 info502 = (srvsvc.ShareInfo502) this.info;

	// Claim key-prefix for LDAP attributes
	ldapAttribPrefix = "ldapAttrib_"

	// Role Claim key
	roleArnClaim = "roleArn"

	// maximum supported STS session policy size
	maxSTSSessionPolicySize = 2048
)

type stsClaims map[string]interface{}

func (c stsClaims) populateSessionPolicy(form url.Values) error {
	if len(form) == 0 {
		return nil
	}

	sessionPolicyStr := form.Get(stsPolicy)
	if len(sessionPolicyStr) == 0 {

import java.util.Stack;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Most of the logic for {@link IteratorTester} and {@link ListIteratorTester}.
 *
 * @param <E> the type of element returned by the iterator
 * @param <I> the type of the iterator ({@link Iterator} or {@link ListIterator})
 * @author Kevin Bourrillion
 * @author Chris Povirk
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault

import java.util.Map.Entry;
import java.util.Set;
import org.junit.Ignore;

/**
 * Tests {@link java.util.Map#entrySet}.
 *
 * @author Louis Wasserman
 * @param <K> The key type of the map implementation under test.
 * @param <V> The value type of the map implementation under test.
 */
@GwtCompatible
@Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.