{* ../../docs_src/first_steps/tutorial001_py39.py hl[7] *}

This is a Python function.

It will be called by **FastAPI** whenever it receives a request to the URL "`/`" using a `GET` operation.

In this case, it is an `async` function.

---

You could also define it as a normal function instead of `async def`:

{* ../../docs_src/first_steps/tutorial003_py39.py hl[7] *}

/// note

{* ../../docs_src/first_steps/tutorial003_py39.py hl[7] *}

/// note | Hinweis

Wenn Sie den Unterschied nicht kennen, lesen Sie [Async: *„In Eile?“*](../async.md#in-a-hurry){.internal-link target=_blank}.

///

### Schritt 5: den Inhalt zurückgeben { #step-5-return-the-content }

{* ../../docs_src/first_steps/tutorial001_py39.py hl[8] *}

# Query Parameters { #query-parameters }

When you declare other function parameters that are not part of the path parameters, they are automatically interpreted as "query" parameters.

{* ../../docs_src/query_params/tutorial001_py39.py hl[9] *}

The query is the set of key-value pairs that go after the `?` in a URL, separated by `&` characters.

For example, in the URL:

```
http://127.0.0.1:8000/items/?skip=0&limit=10
```

Quando você declara outros parâmetros na função que não fazem parte dos parâmetros da rota, esses parâmetros são automaticamente interpretados como parâmetros de "consulta".

{* ../../docs_src/query_params/tutorial001_py39.py hl[9] *}

A consulta é o conjunto de pares chave-valor que vai depois de `?` na URL, separado pelo caractere `&`.

Por exemplo, na URL:

```
http://127.0.0.1:8000/items/?skip=0&limit=10
```

# Parámetros de Query { #query-parameters }

Cuando declaras otros parámetros de función que no son parte de los parámetros de path, son automáticamente interpretados como parámetros de "query".

{* ../../docs_src/query_params/tutorial001_py39.py hl[9] *}

La query es el conjunto de pares clave-valor que van después del `?` en una URL, separados por caracteres `&`.

Por ejemplo, en la URL:

```
http://127.0.0.1:8000/items/?skip=0&limit=10
```

//// tab | Python 3.8 і вище

```Python
{!> ../../docs_src/python_types/tutorial011.py!}
```

////

//// tab | Python 3.9 і вище

```Python
{!> ../../docs_src/python_types/tutorial011_py39.py!}
```

////

//// tab | Python 3.10 і вище

```Python
{!> ../../docs_src/python_types/tutorial011_py310.py!}
```

////

/// info

{* ../../docs_src/path_params_numeric_validations/tutorial003_py39.py hl[7] *}

### Melhor com `Annotated` { #better-with-annotated }

А также ответ со статус-кодом `200`, который использует ваш `response_model`, но включает пользовательский `example`:

{* ../../docs_src/additional_responses/tutorial003_py39.py hl[20:31] *}

Всё это будет объединено и включено в ваш OpenAPI и отображено в документации API:

<img src="/img/tutorial/additional-responses/image01.png">

{* ../../docs_src/path_params_numeric_validations/tutorial003_py39.py hl[7] *}

### Mejor con `Annotated` { #better-with-annotated }

{* ../../docs_src/path_params_numeric_validations/tutorial003_py39.py hl[7] *}

### Besser mit `Annotated` { #better-with-annotated }