!!! check "Inspired **FastAPI** to"
    Define extra validations for data types using the "default" value of model attributes. This improves editor support, and it was not available in Pydantic before.

    This actually inspired updating parts of Pydantic, to support the same validation declaration style (all this functionality is now already available in Pydantic).

But in most of the cases where we need to do something like this, we want the model just to **filter/remove** some of the data as in this example.

* trong <a href="https://code.visualstudio.com/" class="external-link" target="_blank">Visual Studio Code</a>:

![editor support](https://fastapi.tiangolo.com/img/vscode-completion.png)

* trong <a href="https://www.jetbrains.com/pycharm/" class="external-link" target="_blank">PyCharm</a>:

![editor support](https://fastapi.tiangolo.com/img/pycharm-completion.png)

Mais que `file_path` lui-même doit contenir un *chemin*, comme `home/johndoe/myfile.txt` par exemple.

Donc, l'URL pour ce fichier pourrait être : `/files/home/johndoe/myfile.txt`.

### Support d'OpenAPI

OpenAPI ne supporte pas de manière de déclarer un paramètre de chemin contenant un *chemin*, cela pouvant causer des scénarios difficiles à tester et définir.

# Python Types Intro

Python has support for optional "type hints" (also called "type annotations").

These **"type hints"** or annotations are a special syntax that allow declaring the <abbr title="for example: str, int, float, bool">type</abbr> of a variable.

By declaring types for your variables, editors and tools can give you better support.

エディターがどのように役立つかを以下に示します:

* <a href="https://code.visualstudio.com/" class="external-link" target="_blank">Visual Studio Code</a>の場合:

![editor support](https://fastapi.tiangolo.com/img/vscode-completion.png)

* <a href="https://www.jetbrains.com/pycharm/" class="external-link" target="_blank">PyCharm</a>の場合:

![editor support](https://fastapi.tiangolo.com/img/pycharm-completion.png)

以前は不可能だと考えていたコードでさえ補完されます。例えば、リクエストからのJSONボディ（ネストされている可能性がある）内の `price`キーです。

    each OAuth2 flow.

    You normally would not create a new class inheriting from it but use one of the
    existing subclasses, and maybe compose them if you want to support multiple flows.

    Read more about it in the
    [FastAPI docs for Security](https://fastapi.tiangolo.com/tutorial/security/).
    """

    def __init__(
        self,
        *,

* <a href="https://pyyaml.org/wiki/PyYAMLDocumentation" target="_blank"><code>pyyaml</code></a> - Richiesto per il supporto dello `SchemaGenerator` di Starlette (probabilmente non ti serve con FastAPI).
* <a href="https://graphene-python.org/" target="_blank"><code>graphene</code></a> - Richiesto per il supporto di `GraphQLApp`.

Usate da FastAPI / Starlette:

```

...na:

```Python
        ... "item_price": item.price ...
```

...i zobacz jak edytor kodu automatycznie uzupełni atrybuty i będzie znał ich typy:

![editor support](https://fastapi.tiangolo.com/img/vscode-completion.png)

Dla bardziej kompletnych przykładów posiadających więcej funkcjonalności, zobacz <a href="https://fastapi.tiangolo.com/tutorial/">Tutorial - User Guide</a>.

```

...в:

```Python
        ... "item_price": item.price ...
```

... и посмотрите, как ваш редактор будет автоматически заполнять атрибуты и узнавать их типы:

![editor support](https://fastapi.tiangolo.com/img/vscode-completion.png)

Более полный пример с дополнительными функциями см. в <a href="https://fastapi.tiangolo.com/tutorial/">Учебное руководство - Руководство пользователя</a>.