.name("defaultDispatcher")
                .message("Which dispatcher you want to use as default?");
        listPromptBuilder
                .newItem()
                .name(NONE)
                .text("None (disable MavenSecDispatcher)")
                .add();
        for (DispatcherMeta meta : secDispatcher.availableDispatchers()) {
            if (!meta.isHidden()) {
                listPromptBuilder

Cela signifie que `item` peut être un `int` ou un `str`.

#### Possiblement `None` { #possibly-none }

Vous pouvez déclarer qu'une valeur peut avoir un type, comme `str`, mais qu'elle peut aussi être `None`.

//// tab | Python 3.10+

```Python hl_lines="1"
{!> ../../docs_src/python_types/tutorial009_py310.py!}
```

////

## URLs da Documentação { #docs-urls }

Você pode configurar as duas interfaces de documentação incluídas:

* **Swagger UI**: acessível em `/docs`.
    * Você pode definir sua URL com o parâmetro `docs_url`.
    * Você pode desativá-la definindo `docs_url=None`.
* **ReDoc**: acessível em `/redoc`.

    )
    assert response.status_code == 200, response.text
    assert response.json() == {
        "item_id": 5,
        "item": {
            "name": "Foo",
            "description": None,
            "price": 35.4,
            "tax": None,
            "tags": [],
        },
    }


def test_put_empty_body(client: TestClient):
    response = client.put(
        "/items/5",
        json={},
    )

      .assertRequestHeader("Accept-Language", "en-US")
      .assertRequestHeader("Accept-Charset", "UTF-8")
      .assertRequestHeader("If-None-Match") // No If-None-Match on the user's request.
      .assertSentRequestAtMillis(request2SentAt, request2ReceivedAt)
      .assertReceivedResponseAtMillis(request2SentAt, request2ReceivedAt)

								<i class="fa fa-filter" aria-hidden="true"></i>
								<la:message key="labels.chat_filter" />
								<span id="filterBadge" class="badge rounded-pill bg-primary d-none">0</span>
							</button>
							<button type="button" id="newChatBtn" class="btn btn-outline-secondary btn-sm" aria-label="<la:message key="labels.chat_new_chat" />">
								<i class="fa fa-plus" aria-hidden="true"></i>

   * non-nullable {@code cause}, as many users expect to find one.
   */
  public ExecutionError(@Nullable String message, @Nullable Error cause) {
    super(message, cause);
  }

  /**
   * Creates a new instance with {@code null} as its detail message and the given cause. Prefer to
   * provide a non-nullable {@code cause}, as many users expect to find one.
   */

`PUT`은 기존 데이터를 **대체**해야 하는 데이터를 받는 데 사용합니다.

### 대체 시 주의사항 { #warning-about-replacing }

즉, `PUT`으로 항목 `bar`를 업데이트하면서 다음과 같은 body를 보낸다면:

```Python
{
    "name": "Barz",
    "price": 3,
    "description": None,
}
```

이미 저장된 속성 `"tax": 20.2`가 포함되어 있지 않기 때문에, 입력 모델은 `"tax": 10.5`라는 기본값을 사용하게 됩니다.

그리고 데이터는 그 “새로운” `tax` 값 `10.5`로 저장됩니다.

## `PATCH`로 부분 업데이트하기 { #partial-updates-with-patch }

http://127.0.0.1:8000/items/?skip=20
```

函式中的參數值會是：

* `skip=20`：因為你在 URL 中設定了它
* `limit=10`：因為那是預設值

## 選用參數 { #optional-parameters }

同樣地，你可以將預設值設為 `None` 來宣告選用的查詢參數：

{* ../../docs_src/query_params/tutorial002_py310.py hl[7] *}

在這種情況下，函式參數 `q` 為選用，且預設為 `None`。

/// check | 注意

另外請注意，FastAPI 能辨識出路徑參數 `item_id` 是路徑參數，而 `q` 不是，因此 `q` 會被當作查詢參數。

///

## 查詢參數型別轉換 { #query-parameter-type-conversion }

from fastapi import FastAPI
from fastapi.routing import APIRoute

app = FastAPI()


@app.get("/items/")
async def read_items():
    return [{"item_id": "Foo"}]


def use_route_names_as_operation_ids(app: FastAPI) -> None:
    """
    Simplify operation IDs so that generated API clients have simpler function
    names.

    Should be called only after all routes have been added.
    """
    for route in app.routes: