| Paramètre | Type | Description |
|------------|------|-------------|
| `title` | `str` | Le titre de l’API. |
| `summary` | `str` | Un court résumé de l’API. <small>Disponible depuis OpenAPI 3.1.0, FastAPI 0.99.0.</small> |
| `description` | `str` | Une brève description de l’API. Elle peut utiliser Markdown. |

from fastapi import FastAPI
from pydantic import BaseModel as BaseModelV2
from pydantic.v1 import BaseModel


class Item(BaseModel):
    name: str
    description: str | None = None
    size: float


class ItemV2(BaseModelV2):
    name: str
    description: str | None = None
    size: float


app = FastAPI()


@app.post("/items/", response_model=ItemV2)
async def create_item(item: Item):

* `datetime.datetime` :
    * Un `datetime.datetime` Python.
    * Dans les requêtes et les réponses, il sera représenté sous forme de `str` au format ISO 8601, par exemple : `2008-09-15T15:53:00+05:00`.
* `datetime.date` :
    * `datetime.date` Python.
    * Dans les requêtes et les réponses, il sera représenté sous forme de `str` au format ISO 8601, par exemple : `2008-09-15`.

        final String str = message.toString();
        assertTrue(str.contains("..."));
        assertTrue(str.length() < longContent.length() + 50);
    }

    @Test
    public void test_toStringNullContent() {
        final LlmMessage message = new LlmMessage("user", null);
        final String str = message.toString();
        assertTrue(str.contains("content='null'"));
    }

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    description: str | None = None
    price: float
    tax: float | None = None

    model_config = {
        "json_schema_extra": {
            "examples": [
                {
                    "name": "Foo",
                    "description": "A very nice Item",
                    "price": 35.4,

`str`, `int`, `float` vb. normal tekil tiplerin yanında, `str`’den türeyen daha karmaşık tekil tipleri de kullanabilirsiniz.

Tüm seçenekleri görmek için [Pydantic Türlerine Genel Bakış](https://docs.pydantic.dev/latest/concepts/types/) sayfasına göz atın. Sonraki bölümde bazı örnekleri göreceksiniz.

        // Verify field initialization through toString
        String str = notifyChange.toString();
        assertTrue(str.contains("NtTransNotifyChange"));
        assertTrue(str.contains("fid=0x" + Hexdump.toHexString(fid, 4)));
        assertTrue(str.contains("filter=0x" + Hexdump.toHexString(completionFilter, 4)));
        assertTrue(str.contains("watchTree=" + watchTree));
    }

    @Test

@pytest.fixture(name="client")
def get_client():
    from enum import Enum

    app = FastAPI()

    class PlatformRole(str, Enum):
        admin = "admin"
        user = "user"

    class OtherRole(str, Enum): ...

    class User(BaseModel):
        username: str
        role: PlatformRole | OtherRole

    @app.get("/users")
    async def get_user() -> User:

from fastapi import BackgroundTasks, Depends, FastAPI

app = FastAPI()


def write_log(message: str):
    with open("log.txt", mode="a") as log:
        log.write(message)


def get_query(background_tasks: BackgroundTasks, q: str | None = None):
    if q:
        message = f"found query: {q}\n"
        background_tasks.add_task(write_log, message)
    return q


@app.post("/send-notification/{email}")

class User(BaseModel):
    username: str
    email: str | None = None
    full_name: str | None = None
    disabled: bool | None = None


def fake_decode_token(token):
    return User(
        username=token + "fakedecoded", email="******@****.***", full_name="John Doe"
    )


async def get_current_user(token: str = Depends(oauth2_scheme)):
    user = fake_decode_token(token)