/// check | "Checando"

Perceba que você não precisa criar uma classe especial e enviar a dependência para algum outro lugar em que o **FastAPI** a "registre" ou realize qualquer operação similar.

Você apenas envia para `Depends` e o **FastAPI** sabe como fazer o resto.

///

## Compartilhando dependências `Annotated`

En este escenario, cada uno de los limpiadores (incluido tú) sería un procesador, haciendo su parte del trabajo.

Y como la mayor parte del tiempo de ejecución lo coge el trabajo real (en lugar de esperar), y el trabajo en un sistema lo realiza una <abbr title = "Central Processing Unit. En español: Unidad Central de Procesamiento."> CPU </abbr>, a estos problemas se les llama "<abbr title="En español: atado a CPU.">CPU bound</abbr>".

---

```Python hl_lines="3  5-6"
{
    "name": "Baz",
    "description": None,
    "price": 50.2,
    "tax": 10.5,
    "tags": []
}
```

FastAPI is smart enough (actually, Pydantic is smart enough) to realize that, even though `description`, `tax`, and `tags` have the same values as the defaults, they were set explicitly (instead of taken from the defaults).

So, they will be included in the JSON response.

/// tip

create-a-fake-certificate title: How to Create A Fake Certificate Authority And Generate TLS Certs for FastAPI - author: Ben Gamble author_link: https://uk.linkedin.com/in/bengamble7 link: https://ably.com/blog/realtime-ticket-booking-solution-kafka-fastapi-ably title: Building a realtime ticket booking solution with Kafka, FastAPI, and Ably - author: Shahriyar(Shako) Rzayev author_link: https://www.linkedin.com/in/shahriyar-rzayev/ link: https://www.azepug.az/posts/fastapi/#building-simple-e-co...

     * fit comfortably within a single ethernet packet (1500 bytes) even with framing overhead.
     *
     * For tests this must be big enough to realize real compression on test messages like
     * 'aaaaaaaaaa...'. Our tests check if compression was applied just by looking at the size if
     * the inbound buffer.
     */
    const val DEFAULT_MINIMUM_DEFLATE_SIZE = 1024L

Ce chapitre n'est qu'un **tutoriel rapide / rappel** sur les annotations de type Python.
Seulement le minimum nécessaire pour les utiliser avec **FastAPI** sera couvert... ce qui est en réalité très peu.

**FastAPI** est totalement basé sur ces annotations de type, qui lui donnent de nombreux avantages.

     * (Runtime checks could be particularly bad for users of LegacyConverter.)
     *
     * Luckily, our nullness checker is smart enough to realize that `convert` has @PolyNull-like
     * behavior, so it knows that `convert(a)` returns a non-nullable value, and we don't need to
     * perform even a cast, much less a runtime check.
     *

	// Reply with storage information (across nodes in a
	// distributed setup) as json.
	writeSuccessResponseJSON(w, jsonBytes)
}

// MetricsHandler - GET /minio/admin/v3/metrics
// ----------
// Get realtime server metrics
func (a adminAPIHandlers) MetricsHandler(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	objectAPI, _ := validateAdminReq(ctx, w, r, policy.ServerInfoAdminAction)
	if objectAPI == nil {

Ce n'est même pas du Python, NestJS est un framework JavaScript (TypeScript) NodeJS inspiré d'Angular.

Il réalise quelque chose de similaire à ce qui peut être fait avec Flask-apispec.