Desde Python 3.9, `Annotated` es parte de la standard library, así que puedes importarlo desde `typing`.

{* ../../docs_src/python_types/tutorial013_py39.py hl[1,4] *}

///

Por ejemplo, este validador personalizado comprueba que el ID del ítem empiece con `isbn-` para un número de libro <abbr title="International Standard Book Number – Número Estándar Internacional de Libro">ISBN</abbr> o con `imdb-` para un ID de URL de película de <abbr title="IMDB (Internet Movie Database) es un sitio web con información sobre películas">IMDB</abbr>:

	if userDefined["content-type"] == "" {
		userDefined["content-type"] = mimedb.TypeByExtension(path.Ext(object))
	}

	// if storageClass is standard no need to save it as part of metadata.
	if userDefined[xhttp.AmzStorageClass] == storageclass.STANDARD {
		delete(userDefined, xhttp.AmzStorageClass)
	}

	if opts.WantChecksum != nil && opts.WantChecksum.Type.IsSet() {

	defer cancel()

	resetGlobalHealState()
	defer resetGlobalHealState()

	// Set globalStorageClass.STANDARD to EC:4 for this test
	saveSC := globalStorageClass
	defer func() {
		globalStorageClass.Update(saveSC)
	}()
	globalStorageClass.Update(storageclass.Config{
		Standard: storageclass.StorageClass{
			Parity: 4,
		},
	})

	nDisks := 16
	fsDirs, err := getRandomDisks(nDisks)

<div class="termy">

```console
$ pip install uvicorn[standard]

---> 100%
```

</div>

## Приклад

### Створіть

* Створіть файл `main.py` з:

```Python
from typing import Union

from fastapi import FastAPI

///

For example, this custom validator checks that the item ID starts with `isbn-` for an <abbr title="ISBN means International Standard Book Number">ISBN</abbr> book number or with `imdb-` for an <abbr title="IMDB (Internet Movie Database) is a website with information about movies">IMDB</abbr> movie URL ID:

	// RestoreExpires indicates date a restored object expires
	RestoreExpires time.Time

	// RestoreOngoing indicates if a restore is in progress
	RestoreOngoing bool

	// A standard MIME type describing the format of the object.
	ContentType string

	// Specifies what content encodings have been applied to the object and thus
	// what decoding mechanisms must be applied to obtain the object referenced

set to "-", storageClassName: "", which disables dynamic provisioning ## If undefined (the default) or set to null, no storageClassName spec is ## set, choosing the default provisioner. (gp2 on AWS, standard on ## GKE, AWS & OpenStack) ## ## Storage class of PV to bind. By default it looks for standard storage class. ## If the PV uses a different storage class, specify that here. storageClass: "" VolumeName: "" accessMode: ReadWriteOnce size: 500Gi ## If subPath is set mount a sub folder of a volume...

set to "-", storageClassName: "", which disables dynamic provisioning ## If undefined (the default) or set to null, no storageClassName spec is ## set, choosing the default provisioner. (gp2 on AWS, standard on ## GKE, AWS & OpenStack) ## ## Storage class of PV to bind. By default it looks for standard storage class. ## If the PV uses a different storage class, specify that here. storageClass: "" VolumeName: "" accessMode: ReadWriteOnce size: 500Gi ## If subPath is set mount a sub folder of a volume...

set to "-", storageClassName: "", which disables dynamic provisioning ## If undefined (the default) or set to null, no storageClassName spec is ## set, choosing the default provisioner. (gp2 on AWS, standard on ## GKE, AWS & OpenStack) ## ## Storage class of PV to bind. By default it looks for standard storage class. ## If the PV uses a different storage class, specify that here. storageClass: "" volumeName: "" accessMode: ReadWriteOnce size: 500Gi ## If subPath is set mount a sub folder of a volume...