{* ../../docs_src/events/tutorial003_py310.py hl[1,13] *}

파이썬에서 **컨텍스트 매니저**는 `with` 문에서 사용할 수 있는 것입니다. 예를 들어, `open()`은 컨텍스트 매니저로 사용할 수 있습니다:

```Python
with open("file.txt") as file:
    file.read()
```

최근 버전의 파이썬에는 **비동기 컨텍스트 매니저**도 있습니다. 이를 `async with`와 함께 사용합니다:

```Python
async with lifespan(app):
    await do_stuff()
```

```

... et un autre exemple de code console ...

```console
// Créer un répertoire "Code"
$ mkdir code
// Aller dans ce répertoire
$ cd code
```

... et un exemple de code Python ...

```Python
wont_work()  # Cela ne fonctionnera pas 😱
works(foo="bar")  # Cela fonctionne 🎉
```

... et c’est tout.

////

//// tab | Info

Se você quiser brincar com tokens JWT e ver como eles funcionam, visite [https://jwt.io](https://jwt.io/).

## Instalar `PyJWT` { #install-pyjwt }

Nós precisamos instalar o `PyJWT` para criar e verificar os tokens JWT em Python.

Certifique-se de criar um [ambiente virtual](../../virtual-environments.md), ativá-lo e então instalar o `pyjwt`:

<div class="termy">

```console
$ pip install pyjwt

---> 100%
```

</div>

{* ../../docs_src/custom_request_and_route/tutorial001_an_py310.py hl[19:27] *}

/// note | Technische Details

Ein `Request` hat ein `request.scope`-Attribut, welches einfach ein Python-<abbr title="Dictionary – Zuordnungstabelle: In anderen Sprachen auch Hash, Map, Objekt, Assoziatives Array genannt">`dict`</abbr> ist, welches die mit dem Request verbundenen Metadaten enthält.

{"name": "Portal Gun", "description": "A portal opening device."}
{"name": "Meeseeks Box", "description": "A box that summons a Meeseeks."}
```

É muito semelhante a um array JSON (equivalente a uma list do Python), mas em vez de estar envolto em `[]` e ter `,` entre os itens, há **um objeto JSON por linha**, separados por um caractere de nova linha.

/// info | Informação

                      absl::Span<AbstractTensorHandle*> outputs) {
  return ops::Mul(ctx, inputs[0], inputs[1], &outputs[0], "Mul");
}

// TODO(vnvo2409): Add more tests from `python/ops/gradient_checker_v2_test.py`.
// These tests should not be confused with `[*]_grad_test` which compare the
// result of `gradient_checker` and `[*]_grad`. The tests here test the

                    # streaming response completes — not by async generator
                    # finalization via GeneratorExit.
                    # Ref: https://peps.python.org/pep-0789/
                    send_stream, receive_stream = anyio.create_memory_object_stream[
                        bytes
                    ](max_buffer_size=1)

## Instalar `websockets` { #install-websockets }

Asegúrate de crear un [entorno virtual](../virtual-environments.md), activarlo e instalar `websockets` (un paquete de Python que facilita usar el protocolo "WebSocket"):

<div class="termy">

```console
$ pip install websockets

---> 100%
```

</div>

## Cliente WebSockets { #websockets-client }

{* ../../docs_src/custom_request_and_route/tutorial001_an_py310.py hl[19:27] *}

/// note | Technical Details

A `Request` has a `request.scope` attribute, that's just a Python `dict` containing the metadata related to the request.

A `Request` also has a `request.receive`, that's a function to "receive" the body of the request.

### Avertissement concernant le remplacement { #warning-about-replacing }

Cela signifie que si vous souhaitez mettre à jour l’élément `bar` avec `PUT` et un corps contenant :

```Python
{
    "name": "Barz",
    "price": 3,
    "description": None,
}
```

comme il n’inclut pas l’attribut déjà enregistré « tax »: 20.2, le modèle d’entrée prendrait la valeur par défaut « tax »: 10.5.