* <a href="https://docs.porter.run/language-specific-guides/fastapi" class="external-link" target="_blank">Porter</a>

    Sie können diesen Teil wahrscheinlich überspringen.

Es gibt eine alternative Möglichkeit, diese Logik zu definieren, sodass sie beim *Hochfahren* und beim *Herunterfahren* ausgeführt wird.

    ```

=== "Python 3.8+"

    ```Python hl_lines="1  4"
    {!> ../../../docs_src/python_types/tutorial008.py!}
    ```

This means:

* The variable `prices` is a `dict`:
    * The keys of this `dict` are of type `str` (let's say, the name of each item).
    * The values of this `dict` are of type `float` (let's say, the price of each item).

#### Union

from typing import Dict


def process_items(prices: Dict[str, float]):
    for item_name, item_price in prices.items():
        print(item_name)

class CarItem(BaseItem):
    type: str = "car"


class PlaneItem(BaseItem):
    type: str = "plane"
    size: int


items = {
    "item1": {"description": "All my friends drive a low rider", "type": "car"},
    "item2": {
        "description": "Music is my aeroplane, it's my aeroplane",
        "type": "plane",
        "size": 5,
    },
}

## Andere Middlewares

Es gibt viele andere ASGI-Middlewares.

Zum Beispiel:

* <a href="https://docs.sentry.io/platforms/python/guides/fastapi/" class="external-link" target="_blank">Sentry</a>
* <a href="https://github.com/encode/uvicorn/blob/master/uvicorn/middleware/proxy_headers.py" class="external-link" target="_blank">Uvicorns `ProxyHeadersMiddleware`</a>

client = TestClient(app)


def test_get_car():
    response = client.get("/items/item1")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "description": "All my friends drive a low rider",
        "type": "car",
    }


def test_get_plane():
    response = client.get("/items/item2")
    assert response.status_code == 200, response.text
    assert response.json() == {

İkinci parametre ise `dict` değerinin `value` değeri içindir:

```Python hl_lines="1  4"
{!../../../docs_src/python_types/tutorial008.py!}
```

Bu şu anlama gelir:

*  `prices` değişkeni `dict` tipindedir:
    *  `dict` değişkeninin `key` değeri  `str` tipindedir (herbir item'ın "name" değeri).
    *  `dict` değişkeninin `value` değeri `float` tipindedir (lherbir item'ın "price" değeri).

O segundo parâmetro de tipo é para os valores do `dict`:

```Python hl_lines="1 4"
{!../../../docs_src/python_types/tutorial008.py!}
```

Isso significa que:

* A variável `prices` é um dict`:
    * As chaves deste `dict` são do tipo `str` (digamos, o nome de cada item).
    * Os valores deste `dict` são do tipo `float` (digamos, o preço de cada item).

#### `Opcional`

El segundo sub-tipo es para los valores del `dict`:

```Python hl_lines="1  4"
{!../../../docs_src/python_types/tutorial008.py!}
```

Esto significa:

* La variable `prices` es un `dict`:
    * Los keys de este `dict` son de tipo `str` (Digamos que son el nombre de cada ítem).
    * Los valores de este `dict` son de tipo `float` (Digamos que son el precio de cada ítem).

### Clases como tipos