Là encore, vous pouvez combiner `dataclasses` avec des annotations de type standard.

8. Notez que cette *fonction de chemin d'accès* utilise un `def` classique au lieu de `async def`.

    Comme toujours, avec FastAPI vous pouvez combiner `def` et `async def` selon vos besoins.

    price: float


@app.get("/product")
async def create_item(product: Product):
    return product


client = TestClient(app)


def test_get_with_body():
    body = {"name": "Foo", "description": "Some description", "price": 5.5}
    response = client.request("GET", "/product", json=body)
    assert response.json() == body


def test_openapi_schema():
    response = client.get("/openapi.json")

    response_class=JsonApiResponse,
    responses={500: {"description": "Error", "model": JsonApiError}},
)
async def a():
    pass  # pragma: no cover


@app.get("/b", responses={500: {"description": "Error", "model": Error}})
async def b():
    pass  # pragma: no cover


client = TestClient(app)


def test_openapi_schema():
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text

app = FastAPI()


@app.get("/items/")
def read_items(q: list[int] = Query(default=None)):
    return {"q": q}


client = TestClient(app)


def test_multi_query():
    response = client.get("/items/?q=5&q=6")
    assert response.status_code == 200, response.text
    assert response.json() == {"q": [5, 6]}


def test_multi_query_incorrect():
    response = client.get("/items/?q=five&q=six")

from fastapi.testclient import TestClient

from docs_src.advanced_middleware.tutorial003_py310 import app


@app.get("/large")
async def large():
    return PlainTextResponse("x" * 4000, status_code=200)


client = TestClient(app)


def test_middleware():
    response = client.get("/large", headers={"accept-encoding": "gzip"})
    assert response.status_code == 200, response.text

Если комментарий не соответствует этому шаблону, инструмент исправления не будет его сохранять.

```python
#Function declaration
def hello_world():# Print greeting
    print("Hello, world!")  #Print greeting without space after hash
```

```console
//Function declaration
def hello_world():// Print greeting
    print("Hello, world!")  //Print greeting without space after slashes
```

from docs_src.behind_a_proxy.tutorial001_py310 import app

client = TestClient(app, root_path="/api/v1")


def test_main():
    response = client.get("/app")
    assert response.status_code == 200
    assert response.json() == {"message": "Hello World", "root_path": "/api/v1"}


def test_openapi():
    response = client.get("/openapi.json")
    assert response.status_code == 200

Bu, parametre alabilen standart bir fonksiyondur.

`async def` de olabilir, normal `def` de olabilir; **FastAPI** bunu doğru şekilde nasıl ele alacağını bilir.

Bu örnekte görev fonksiyonu bir dosyaya yazacaktır (email göndermeyi simüle ediyor).

Ve yazma işlemi `async` ve `await` kullanmadığı için fonksiyonu normal `def` ile tanımlarız:

{* ../../docs_src/background_tasks/tutorial001_py310.py hl[6:9] *}

app = FastAPI()


@app.exception_handler(StarletteHTTPException)
async def http_exception_handler(request, exc):
    return PlainTextResponse(str(exc.detail), status_code=exc.status_code)


@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request, exc: RequestValidationError):
    message = "Validation errors:"
    for error in exc.errors():

        pytest.param("tutorial001_an_py310", marks=needs_py310),
    ],
)
def get_client(request: pytest.FixtureRequest):
    mod = importlib.import_module(f"docs_src.additional_status_codes.{request.param}")

    client = TestClient(mod.app)
    return client


def test_update(client: TestClient):
    response = client.put("/items/foo", json={"name": "Wrestlers"})