```

기본값 `None`을 `Query(None)`으로 바꿔야 하므로, `Query`의 첫 번째 매개변수는 기본값을 정의하는 것과 같은 목적으로 사용됩니다.

그러므로:

```Python
q: Optional[str] = Query(None)
```

...위 코드는 아래와 동일하게 매개변수를 선택적으로 만듭니다:

```Python
q: Optional[str] = None
```

하지만 명시적으로 쿼리 매개변수를 선언합니다.

/// info | "정보"

FastAPI는 다음 부분에 관심이 있습니다:

```Python
= None
```

또는:

```Python
= Query(None)

from pydantic import BaseModel
from typing_extensions import Annotated

app = FastAPI()


class Item(BaseModel):
    name: str
    description: Union[str, None] = None
    price: float
    tax: Union[float, None] = None


@app.put("/items/{item_id}")
async def update_item(
    *,
    item_id: int,
    item: Annotated[
        Item,
        Body(
            openapi_examples={

    assert response.status_code == 200, response.text
    assert response.json() == {"name": "Wrestlers", "size": None}


def test_create():
    response = client.put("/items/red", json={"name": "Chillies"})
    assert response.status_code == 201, response.text

    assert response.status_code == 200, response.text
    assert response.json() == {"name": "Wrestlers", "size": None}


def test_create():
    response = client.put("/items/red", json={"name": "Chillies"})
    assert response.status_code == 201, response.text

app = FastAPI()


@app.get("/items/")
async def read_items(
    q: Annotated[
        Union[str, None],
        Query(
            title="Query string",
            description="Query string for the items to search in the database that have a good match",
            min_length=3,
        ),
    ] = None,
):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:
        results.update({"q": q})

@app.put("/items/{item_id}")
async def read_items(
    item_id: UUID,
    start_datetime: datetime = Body(),
    end_datetime: datetime = Body(),
    process_after: timedelta = Body(),
    repeat_at: time | None = Body(default=None),
):
    start_process = start_datetime + process_after
    duration = end_datetime - start_process
    return {
        "item_id": item_id,
        "start_datetime": start_datetime,

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COMMIT
* raw
-N ISTIO_OUTPUT
-N ISTIO_PRERT
-A PREROUTING -j ISTIO_PRERT
-A OUTPUT -j ISTIO_OUTPUT
-A ISTIO_OUTPUT -p udp -m mark --mark 0x539/0xfff -m udp --dport 53 -j CT --zone 1
-A ISTIO_PRERT -p udp -m mark ! --mark 0x539/0xfff -m udp --sport 53 -j CT --zone 1
COMMIT
* mangle
-N ISTIO_PRERT
-N ISTIO_OUTPUT
-A PREROUTING -j ISTIO_PRERT
-A OUTPUT -j ISTIO_OUTPUT

        def read_items(q: List[Item] = Query(default=None)):
            pass  # pragma: no cover


def test_invalid_tuple():
    with pytest.raises(AssertionError):
        app = FastAPI()

        class Item(BaseModel):
            title: str

        @app.get("/items/")
        def read_items(q: Tuple[Item, Item] = Query(default=None)):
            pass  # pragma: no cover


def test_invalid_dict():

  rules:
  - apiGroups:
    - metallb.io
    apiVersions:
    - v1beta2
    operations:
    - CREATE
    - UPDATE
    resources:
    - bgppeers
  sideEffects: None
- admissionReviewVersions:
  - v1
  clientConfig:
    service:
      name: webhook-service
      namespace: metallb-system
      path: /validate-metallb-io-v1beta1-bfdprofile
  failurePolicy: Fail