* `externalDocs`: un `dict` que describe documentación externa con:
    * `description`: un `str` con una breve descripción para la documentación externa.
    * `url` (**requerido**): un `str` con la URL para la documentación externa.

### Crear metadata para etiquetas { #create-metadata-for-tags }

Probemos eso en un ejemplo con etiquetas para `users` y `items`.

Starlette (und **FastAPI**) basieren auf <a href="https://anyio.readthedocs.io/en/stable/" class="external-link" target="_blank">AnyIO</a>, was bedeutet, dass es sowohl kompatibel mit der Python-Standardbibliothek <a href="https://docs.python.org/3/library/asyncio-task.html" class="external-link" target="_blank">asyncio</a> als auch mit <a href="https://trio.readthedocs.io/en/stable/" class="external-link" target="_blank">Trio</a> ist.

import okhttp3.Call
import okhttp3.Connection
import okhttp3.Route
import okio.IOException

/**
 * Listener for connection events. Extend this class to monitor the new connections and closes.
 *
 * All event methods must execute fast, without external locking, cannot throw exceptions,
 * attempt to mutate the event parameters, or be reentrant back into the client.

Thanks to <a href="https://www.starlette.dev/testclient/" class="external-link" target="_blank">Starlette</a>, testing **FastAPI** applications is easy and enjoyable.

It is based on <a href="https://www.python-httpx.org" class="external-link" target="_blank">HTTPX</a>, which in turn is designed based on Requests, so it's very familiar and intuitive.

With it, you can use <a href="https://docs.pytest.org/" class="external-link" target="_blank">pytest</a> directly with **FastAPI**.

<small>* estimation basée sur des tests d'une équipe de développement interne, construisant des applications de production.</small>

## Sponsors

<!-- sponsors -->

#### Pour davantage de détails

Imaginons que votre fichier s'appelle `myapp.py`.

Si vous l'exécutez avec :

<div class="termy">

```console
$ python myapp.py
```

</div>

alors la variable interne `__name__` de votre fichier, créée automatiquement par Python, aura pour valeur la chaîne de caractères `"__main__"`.

Ainsi, la section :

```Python
    uvicorn.run(app, host="0.0.0.0", port=8000)
```

Die vorherigen Screenshots wurden mit <a href="https://code.visualstudio.com" class="external-link" target="_blank">Visual Studio Code</a> aufgenommen.

Aber Sie würden die gleiche Editor-Unterstützung in <a href="https://www.jetbrains.com/pycharm/" class="external-link" target="_blank">PyCharm</a> und den meisten anderen Python-Editoren erhalten:

<img src="/img/tutorial/body/image05.png">

* <a href="https://sqlmodel.tiangolo.com/" class="external-link" target="_blank">Link externo</a>
* <a href="https://fastapi.tiangolo.com/css/styles.css" class="external-link" target="_blank">Link para um estilo</a>
* <a href="https://fastapi.tiangolo.com/js/logic.js" class="external-link" target="_blank">Link para um script</a>
* <a href="https://fastapi.tiangolo.com/img/foo.jpg" class="external-link" target="_blank">Link para uma imagem</a>

TF_CAPI_EXPORT extern int TF_OperationNumOutputs(TF_Operation* oper);
TF_CAPI_EXPORT extern TF_DataType TF_OperationOutputType(TF_Output oper_out);
TF_CAPI_EXPORT extern int TF_OperationOutputListLength(TF_Operation* oper,
                                                       const char* arg_name,
                                                       TF_Status* status);

Puedes lograr eso usando <a href="https://docs.pydantic.dev/latest/concepts/validators/#field-after-validator" class="external-link" target="_blank">`AfterValidator` de Pydantic</a> dentro de `Annotated`.

/// tip | Consejo

Pydantic también tiene <a href="https://docs.pydantic.dev/latest/concepts/validators/#field-before-validator" class="external-link" target="_blank">`BeforeValidator`</a> y otros. 🤓

///