"tax": None,
    }


@needs_py310
def test_post_with_str_float_description_tax(client: TestClient):
    response = client.post(
        "/items/",
        json={"name": "Foo", "price": "50.5", "description": "Some Foo", "tax": 0.3},
    )
    assert response.status_code == 200
    assert response.json() == {
        "name": "Foo",
        "price": 50.5,
        "description": "Some Foo",

        "tax": None,
    }


def test_post_with_str_float_description_tax(client: TestClient):
    response = client.post(
        "/items/",
        json={"name": "Foo", "price": "50.5", "description": "Some Foo", "tax": 0.3},
    )
    assert response.status_code == 200
    assert response.json() == {
        "name": "Foo",
        "price": 50.5,
        "description": "Some Foo",
        "tax": 0.3,
    }

    assert response.status_code == 200
    assert response.json() == "foo bar"


def test_query_int_optional_query_50():
    response = client.get("/query/int/optional?query=50")
    assert response.status_code == 200
    assert response.json() == "foo bar 50"


def test_query_int_optional_query_foo():
    response = client.get("/query/int/optional?query=foo")
    assert response.status_code == 422

    return {"alias": "Foo"}


@app.get("/by-alias/model", response_model=Model)
def by_alias_model():
    return Model(alias="Foo")


@app.get("/by-alias/list", response_model=List[Model])
def by_alias_list():
    return [{"alias": "Foo"}, {"alias": "Bar"}]


@app.get("/no-alias/dict", response_model=ModelNoAlias)
def no_alias_dict():
    return {"name": "Foo"}

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

Если запустите этот пример и перейдёте по адресу: <a href="http://127.0.0.1:8000/items/foo" class="external-link" target="_blank">http://127.0.0.1:8000/items/foo</a>, то увидите ответ:

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

## Параметры пути с типами

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

```Python hl_lines="7"

Donc, si vous exécutez cet exemple et allez sur <a href="http://127.0.0.1:8000/items/foo" class="external-link" target="_blank">http://127.0.0.1:8000/items/foo</a>,
vous verrez comme réponse :

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

## Paramètres de chemin typés

Ce qui fait qu'avec une URL comme :

```
http://localhost:8000/items/?q=foo&q=bar
```

vous recevriez les valeurs des multiples paramètres de requête `q` (`foo` et `bar`) dans une `list` Python au sein de votre fonction de **path operation**, dans le paramètre de fonction `q`.

Donc la réponse de cette URL serait :

```JSON
{
  "q": [
    "foo",
    "bar"
  ]
}
```

!!! tip "Astuce"

                },
            ]
        }
    )


def test_users_foo_token_jessica(client: TestClient):
    response = client.get("/users/foo?token=jessica")
    assert response.status_code == 200
    assert response.json() == {"username": "foo"}


def test_users_foo_with_no_token(client: TestClient):
    response = client.get("/users/foo")
    assert response.status_code == 422
    assert response.json() == IsDict(

            ]
        }
    )


@needs_py39
def test_users_foo_token_jessica(client: TestClient):
    response = client.get("/users/foo?token=jessica")
    assert response.status_code == 200
    assert response.json() == {"username": "foo"}


@needs_py39
def test_users_foo_with_no_token(client: TestClient):
    response = client.get("/users/foo")
    assert response.status_code == 422
    assert response.json() == IsDict(

    ```

Das würde bedeuten, dass **FastAPI** einen Body erwartet wie:

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2,
    "tags": ["rock", "metal", "bar"],
    "image": {
        "url": "http://example.com/baz.jpg",
        "name": "The Foo live"
    }
}
```

Wiederum, nur mit dieser Deklaration erhalten Sie von **FastAPI**: