## Utiliser `BackgroundTasks`

Pour commencer, importez `BackgroundTasks` et définissez un paramètre dans votre *fonction de chemin* avec `BackgroundTasks` comme type déclaré.

{* ../../docs_src/background_tasks/tutorial001.py hl[1,13] *}

**FastAPI** créera l'objet de type `BackgroundTasks` pour vous et le passera comme paramètre.

## Créer une fonction de tâche

    private int currentPageNumber;

    /** The ID of the label type. */
    public String id;

    /** The name of the label type. */
    public String name;

    /** The value of the label type. */
    public String value;

    /** The sort order of the label type. */
    public String sortOrder;

    /** The creator of the label type. */
    public String createdBy;

 */

package com.google.common.collect.testing;

import com.google.common.annotations.GwtCompatible;

/**
 * A type which will never be used as the element type of any collection in our tests, and so can be
 * used to test how a Collection behaves when given input of the wrong type.
 */
@GwtCompatible
public enum WrongType {
  VALUE

	for tier, stats := range ts {
		infos = append(infos, madmin.TierInfo{
			Name:  tier,
			Type:  globalTierConfigMgr.TierType(tier),
			Stats: stats,
		})
	}

	sort.Slice(infos, func(i, j int) bool {
		if infos[i].Type == "internal" {
			return true
		}
		if infos[j].Type == "internal" {
			return false
		}
		return infos[i].Name < infos[j].Name
	})
	return infos
}

        @DisplayName("Should handle share type")
        void testShareType() throws Exception {
            // Test DISK share type
            setPrivateField(response, "shareType", Smb2TreeConnectResponse.SMB2_SHARE_TYPE_DISK);
            assertEquals(Smb2TreeConnectResponse.SMB2_SHARE_TYPE_DISK, response.getShareType(), "Should handle DISK share type");

            // Test PIPE share type

    }

    @Test
    @DisplayName("Test readBytesWireFormat with unknown info type throws exception")
    void testReadBytesWireFormatUnknownInfoType() {
        response = new Smb2QueryInfoResponse(mockConfig, (byte) 99, // Unknown info type
                (byte) 0);

        byte[] buffer = new byte[1024];
        int bufferIndex = 0;

# code.
#
# https://github.com/kubernetes/test-infra/blob/master/prow/plugins/size/size.go
#
# This file is a series of lines, each of the form:
#     <type> <name>
#
# Type can be:
#    path - an exact path to a single file
#    file-name - an exact leaf filename, regardless of path
#    path-prefix - a prefix match on the file path

        String name;
        int versionMajor;
        int versionMinor;
        int type;
        String commentOrMasterBrowser;

        @Override
        public String getName() {
            return name;
        }

        @Override
        public int getType() {
            return (type & 0x80000000) != 0 ? SmbFile.TYPE_WORKGROUP : SmbFile.TYPE_SERVER;
        }

        @Override

Para añadirlo a tu *path operation*, decláralo de la misma manera que declaraste parámetros de path y query:

{* ../../docs_src/body/tutorial001_py310.py hl[16] *}

...y declara su tipo como el modelo que creaste, `Item`.

## Resultados

Con solo esa declaración de tipo en Python, **FastAPI** hará lo siguiente:

* Leer el body del request como JSON.
* Convertir los tipos correspondientes (si es necesario).
* Validar los datos.

	return signedHeaders, ErrNone
}

// signValues data type represents structured form of AWS Signature V4 header.
type signValues struct {
	Credential    credentialHeader
	SignedHeaders []string
	Signature     string
}

// preSignValues data type represents structured form of AWS Signature V4 query string.
type preSignValues struct {
	signValues
	Date    time.Time
	Expires time.Duration
}