def main(some_arg, q: str | None = None):
    return {"some_arg": some_arg, "q": q}


endpoint = partial(main, "foo")

app = FastAPI()

app.get("/")(endpoint)


client = TestClient(app)


def test_partial():
    response = client.get("/?q=bar")
    data = response.json()

                                "content": {
                                    "application/json": {
                                        "schema": {
                                            "title": "Response Foo Post Root",
                                            "type": "array",
                                            "items": {
                                                "$ref": "#/components/schemas/Item"

    return client


def test_items_5(client: TestClient):
    response = client.put("/items/5", json={"item": {"name": "Foo", "price": 3.0}})
    assert response.status_code == 200
    assert response.json() == {
        "item_id": 5,
        "item": {"name": "Foo", "price": 3.0, "description": None, "tax": None},
    }


def test_items_6(client: TestClient):
    response = client.put(
        "/items/6",

In diesem Fall erwartet **FastAPI** einen Body wie:

```JSON hl_lines="2"
{
    "item": {
        "name": "Foo",
        "description": "The pretender",
        "price": 42.0,
        "tax": 3.2
    }
}
```

statt:

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2
}
```

## Zusammenfassung { #recap }

У цьому випадку **FastAPI** очікуватиме тіло такого вигляду:

```JSON hl_lines="2"
{
    "item": {
        "name": "Foo",
        "description": "The pretender",
        "price": 42.0,
        "tax": 3.2
    }
}
```

замість:

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2
}
```

## Підсумок { #recap }

def test_post_invalid_body(client: TestClient):
    data = {"foo": 2.2, "3": 3.3}
    response = client.post("/index-weights/", json=data)
    assert response.status_code == 422, response.text
    assert response.json() == {
        "detail": [
            {
                "type": "int_parsing",
                "loc": ["body", "foo", "[key]"],

Значение параметра пути `item_id` будет передано в функцию в качестве аргумента `item_id`.

Если запустите этот пример и перейдёте по адресу: [http://127.0.0.1:8000/items/foo](http://127.0.0.1:8000/items/foo), то увидите ответ:

```JSON
{"item_id":"foo"}
```

## Параметры пути с типами { #path-parameters-with-types }

Вы можете объявить тип параметра пути в функции, используя стандартные аннотации типов Python:

    * Değilse, client faydalı ve anlaşılır bir hata görür.
* `GET` request'leri için `q` adlı opsiyonel bir query parameter olup olmadığını kontrol eder (`http://127.0.0.1:8000/items/foo?q=somequery` örneğindeki gibi).
    * `q` parametresi `= None` ile tanımlandığı için opsiyoneldir.
    * `None` olmasaydı zorunlu olurdu (tıpkı `PUT` örneğindeki body gibi).

Dans ce cas, si vous allez sur :

```
http://127.0.0.1:8000/items/foo?short=1
```

ou

```
http://127.0.0.1:8000/items/foo?short=True
```

ou

```
http://127.0.0.1:8000/items/foo?short=true
```

ou

```
http://127.0.0.1:8000/items/foo?short=on
```

ou

```
http://127.0.0.1:8000/items/foo?short=yes
```

Wenn Sie dieses Beispiel ausführen und auf [http://127.0.0.1:8000/items/foo](http://127.0.0.1:8000/items/foo) gehen, sehen Sie als <abbr title="Response – Antwort: Daten, die der Server zum anfragenden Client zurücksendet">Response</abbr>:

```JSON
{"item_id":"foo"}
```

## Pfad-Parameter mit Typen { #path-parameters-with-types }