///

**FastAPI** est basé entièrement sur **Pydantic**.

Vous verrez bien plus d'exemples de son utilisation dans [Tutoriel - Guide utilisateur](tutorial/index.md){.internal-link target=_blank}.

## Les annotations de type dans **FastAPI**

**FastAPI** utilise ces annotations pour faire différentes choses.

```console
$ pip install python-multipart
```

///

## Import `Form`

Import `Form` from `fastapi`:

//// tab | Python 3.9+

```Python hl_lines="3"
{!> ../../docs_src/request_forms/tutorial001_an_py39.py!}
```

////

//// tab | Python 3.8+

```Python hl_lines="1"

from fastapi.testclient import TestClient

from docs_src.path_operation_configuration.tutorial005 import app

from ...utils import needs_pydanticv1, needs_pydanticv2

client = TestClient(app)


def test_query_params_str_validations():
    response = client.post("/items/", json={"name": "Foo", "price": 42})
    assert response.status_code == 200, response.text
    assert response.json() == {
        "name": "Foo",
        "price": 42,

from base64 import b64encode

from fastapi.testclient import TestClient

from docs_src.security.tutorial006 import app

client = TestClient(app)


def test_security_http_basic():
    response = client.get("/users/me", auth=("john", "secret"))
    assert response.status_code == 200, response.text
    assert response.json() == {"username": "john", "password": "secret"}


def test_security_http_basic_no_credentials():

///

## Các gợi ý kiểu dữ liệu trong **FastAPI**

**FastAPI** lấy các ưu điểm của các gợi ý kiểu dữ liệu để thực hiện một số thứ.

Với **FastAPI**, bạn khai báo các tham số với gợi ý kiểu và bạn có được:

* **Sự hỗ trợ từ các trình soạn thảo**.
* **Kiểm tra kiểu dữ liệu (type checking)**.

...và **FastAPI** sử dụng các khia báo để:

* Erstellen Sie eine leere Datei `__init__.py`.
* Erstellen Sie eine `main.py`-Datei mit:

```Python
from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

### Dockerfile

/// info

Sofern Sie in Ihrem Parameter `responses` nicht explizit einen anderen Medientyp angeben, geht FastAPI davon aus, dass die Response denselben Medientyp wie die Haupt-Response-Klasse hat (Standardmäßig `application/json`).

Wenn Sie jedoch eine benutzerdefinierte Response-Klasse mit `None` als Medientyp angegeben haben, verwendet FastAPI `application/json` für jede zusätzliche Response, die über ein zugehöriges Modell verfügt.

///

///

/// info

Unless you specify a different media type explicitly in your `responses` parameter, FastAPI will assume the response has the same media type as the main response class (default `application/json`).

But if you have specified a custom response class with `None` as its media type, FastAPI will use `application/json` for any additional response that has an associated model.

///

## Combining information

```Python hl_lines="2  6"
{!../../docs_src/static_files/tutorial001.py!}
```

/// note | "📡 ℹ"

👆 💪 ⚙️ `from starlette.staticfiles import StaticFiles`.

**FastAPI** 🚚 🎏 `starlette.staticfiles` `fastapi.staticfiles` 🏪 👆, 👩‍💻. ✋️ ⚫️ 🤙 👟 🔗 ⚪️➡️ 💃.

///

### ⚫️❔ "🗜"

"🗜" ⛓ ❎ 🏁 "🔬" 🈸 🎯 ➡, 👈 ⤴️ ✊ 💅 🚚 🌐 🎧-➡.

///

**FastAPI** はすべてPydanticをベースにしています。

すべてのことは[チュートリアル - ユーザーガイド](tutorial/index.md){.internal-link target=_blank}で実際に見ることができます。

## **FastAPI**での型ヒント

**FastAPI** はこれらの型ヒントを利用していくつかのことを行います。

**FastAPI** では型ヒントを使って型パラメータを宣言すると以下のものが得られます:

* **エディタサポート**.
* **型チェック**.

...そして **FastAPI** は同じように宣言をすると、以下のことを行います: