Estas dependencias pueden `raise` excepciones, igual que las dependencias normales:

{* ../../docs_src/dependencies/tutorial006_an_py310.py hl[10,15] *}

### Valores de retorno { #return-values }

Y pueden devolver valores o no, los valores no serán usados.

Así que, puedes reutilizar una dependencia normal (que devuelve un valor) que ya uses en otro lugar, y aunque el valor no se use, la dependencia será ejecutada:

## HTTPX { #httpx }

Auch wenn Ihre **FastAPI**-Anwendung normale `def`-Funktionen anstelle von `async def` verwendet, handelt es sich darunter immer noch um eine `async`-Anwendung.

Response'dan sonra `yield` satırını takip eden kod çalıştırılır:

{* ../../docs_src/dependencies/tutorial007_py310.py hl[5:6] *}

/// tip | İpucu

`async` ya da normal fonksiyonlar kullanabilirsiniz.

**FastAPI**, normal dependency'lerde olduğu gibi her ikisinde de doğru şekilde davranır.

///

## `yield` ve `try` ile Bir Dependency { #a-dependency-with-yield-and-try }

Elle peut être une fonction asynchrone (`async def`) ou une fonction normale (`def`), **FastAPI** saura la gérer correctement.

Dans cet exemple, la fonction de tâche écrira dans un fichier (afin de simuler un envoi d'email).

L'opération d'écriture n'utilisant ni `async` ni `await`, on définit la fonction avec un `def` normal.

{* ../../docs_src/background_tasks/tutorial001_py310.py hl[6:9] *}

### *path operation functions* no async { #non-async-path-operation-functions }

También puedes usar funciones `def` normales (sin `async`) y usar `yield` de la misma manera.

{* ../../docs_src/stream_data/tutorial001_py310.py ln[26:29] hl[27] *}

### Sin anotación { #no-annotation }

are in bit reversed order. var productTable [16]gcmFieldElement // We precompute 16 multiples of H. However, when we do lookups // into this table we'll be using bits from a field element and // therefore the bits will be in the reverse order. So normally one // would expect, say, 4*H to be in index 4 of the table but due to // this bit ordering it will actually be in index 0010 (base 2) = 2. x := gcmFieldElement{ byteorder.BEUint64(H[:8]), byteorder.BEUint64(H[8:]), } productTable[reverseBits(1)]...

are in bit reversed order. var productTable [16]gcmFieldElement // We precompute 16 multiples of H. However, when we do lookups // into this table we'll be using bits from a field element and // therefore the bits will be in the reverse order. So normally one // would expect, say, 4*H to be in index 4 of the table but due to // this bit ordering it will actually be in index 0010 (base 2) = 2. x := gcmFieldElement{ byteorder.BEUint64(H[:8]), byteorder.BEUint64(H[8:]), } productTable[reverseBits(1)]...

Es kann sich um eine `async def`- oder normale `def`-Funktion handeln. **FastAPI** weiß, wie damit zu verfahren ist.

In diesem Fall schreibt die Taskfunktion in eine Datei (den Versand einer E-Mail simulierend).

Und da der Schreibvorgang nicht `async` und `await` verwendet, definieren wir die Funktion mit normalem `def`:

{* ../../docs_src/background_tasks/tutorial001_py310.py hl[6:9] *}

Bu davranış FastAPI 0.106.0'da, response'un ağ üzerinde taşınmasını beklerken resource tutmamak amacıyla değiştirildi.

/// tip | İpucu

Ek olarak, bir background task normalde ayrı ele alınması gereken bağımsız bir mantık setidir ve kendi resource'larına sahip olmalıdır (ör. kendi veritabanı bağlantısı).

Bu şekilde muhtemelen daha temiz bir kod elde edersiniz.

///

Puedes usar `async def` o `def` normal.

Y puedes declarar dependencias con `async def` dentro de *path operation functions* normales `def`, o dependencias `def` dentro de *path operation functions* `async def`, etc.

No importa. **FastAPI** sabrá qué hacer.

/// note | Nota