{* ../../docs_src/path_operation_configuration/tutorial003_py310.py hl[18:19] *}

## Descripción desde docstring

# Usando Dataclasses

FastAPI está construido sobre **Pydantic**, y te he estado mostrando cómo usar modelos de Pydantic para declarar requests y responses.

Pero FastAPI también soporta el uso de <a href="https://docs.python.org/3/library/dataclasses.html" class="external-link" target="_blank">`dataclasses`</a> de la misma manera:

{* ../../docs_src/dataclasses/tutorial001.py hl[1,7:12,19:20] *}

# Usando Dataclasses

FastAPI é construído em cima do **Pydantic**, e eu tenho mostrado como usar modelos Pydantic para declarar requisições e respostas.

Mas o FastAPI também suporta o uso de <a href="https://docs.python.org/3/library/dataclasses.html" class="external-link" target="_blank">`dataclasses`</a> da mesma forma:

{* ../../docs_src/dataclasses/tutorial001.py hl[1,7:12,19:20] *}

  }

  /**
   * Compares two comparable objects as specified by {@link Comparable#compareTo}, <i>if</i> the
   * result of this comparison chain has not already been determined.
   *
   * <p>This method is declared to accept any 2 {@code Comparable} objects, even if they are not <a
   * href="https://docs.oracle.com/javase/tutorial/collections/interfaces/order.html">mutually

 *
 * <p>The class is thread-safe due to the use of {@code synchronized} keyword on methods that
 * modify the internal data structures. The internal maps are also declared as {@code volatile}
 * to ensure visibility of changes across threads.
 *
 * <p>The class also provides methods to manage URL patterns for inclusion and exclusion, which
 * are stored as {@code Pattern} objects.
 */

{* ../../docs_src/path_operation_configuration/tutorial003.py hl[20:21] *}

## Descrição do docstring

Como as descrições tendem a ser longas e cobrir várias linhas, você pode declarar a descrição da *operação de rota* na <abbr title="uma string de várias linhas como a primeira expressão dentro de uma função (não atribuída a nenhuma variável) usada para documentação">docstring</abbr> da função e o **FastAPI** irá lê-la de lá.

 * return null; // Didn't find a preemptive auth scheme.
 * ```
 *
 * ## Reactive Authentication
 *
 * Implementations authenticate by returning a follow-up request that includes an authorization
 * header, or they may decline the challenge by returning null. In this case the unauthenticated
 * response will be returned to the caller that triggered it.
 *
 * Implementations should check if the initial request already included an attempt to

- Fix delete pod declare no controllor note. ([#120159](https://github.com/kubernetes/kubernetes/pull/120159), [@Ithrael](https://github.com/Ithrael)) [SIG CLI]

### Bug or Regression

## Inyección de Dependencias

Usar `BackgroundTasks` también funciona con el sistema de inyección de dependencias, puedes declarar un parámetro de tipo `BackgroundTasks` en varios niveles: en una *path operation function*, en una dependencia (dependable), en una sub-dependencia, etc.

	**Action Required:** When upgrading to Kubernetes 1.7 (and a [network plugin](https://kubernetes.io/docs/tasks/administer-cluster/declare-network-policy/) that supports the new NetworkPolicy v1 semantics), you should consider the following.