Doc(
                """
                The default response class to be used.

                Read more in the
                [FastAPI docs for Custom Response - HTML, Stream, File, others](https://fastapi.tiangolo.com/advanced/custom-response/#default-response-class).
                """
            ),
        ] = Default(JSONResponse),
        responses: Annotated[

);o.default(l).one(d.TRANSITION_END,(function(){o.default(u).removeClass(n+" "+i).addClass(S),o.default(l).removeClass("active "+i+" "+n),s._isSliding=!1,setTimeout((function(){return o.default(s._element).trigger(h)}),0)})).emulateTransitionEnd(g)}else o.default(l).removeClass(S),o.default(u).addClass(S),this._isSliding=!1,o.default(this._element).trigger(h);c&&this.cycle()}},t._jQueryInterface=function(e){return this.each((function(){var n=o.default(this).data(w),i=r({},k,o.default(this).data());"object"==typeof...

     *
     * @return timeout for establishing a socket connection, in milliseconds
     */
    int getConnTimeout();

    /**
     * Property {@code jcifs.smb.client.sessionTimeout} (int, default 35000)
     *
     *
     * @return timeout for SMB sessions, in milliseconds
     */
    int getSessionTimeout();

    /**
     *

    private static final long serialVersionUID = 1L;

    /**
     * Default constructor.
     */
    public KeyMatchPager() {
        // Default constructor
    }

    /** The default page size. */
    public static final int DEFAULT_PAGE_SIZE = 20;

    /** The default current page number. */
    public static final int DEFAULT_CURRENT_PAGE_NUMBER = 1;

#
# Adjustment Properties:
# o generateOutputDirectory: (NotRequired - Default Java:'../src/main/java' CSharp:'../source')
# o resourceOutputDirectory: (NotRequired - Default '../resources')
# o isTableNameCamelCase: (NotRequired - Default false)
# o isColumnNameCamelCase: (NotRequired - Default false)
# o projectPrefix: (NotRequired - Default '')
# o classAuthor: (NotRequired - Default 'DBFlute(AutoGenerator)')

     * This file should contain mappings that override default stemming for specific words.
     */
    @Required
    public MultipartFormFile stemmerOverrideFile;

    /**
     * Default constructor for UploadForm.
     * Creates a new instance with default values.
     */
    public UploadForm() {
        // Default constructor
    }

public class WebConfigPager implements Serializable {

    /**
     * Default constructor.
     */
    public WebConfigPager() {
        // Default constructor
    }

    private static final long serialVersionUID = 1L;

    /**
     * Default page size for pagination.
     */
    public static final int DEFAULT_PAGE_SIZE = 20;

    /**
     * Default current page number.
     */

        @app.get("/items/")
        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

Python will complain if you put a value with a "default" before a value that doesn't have a "default".

But you can re-order them, and have the value without a default (the query parameter `q`) first.

It doesn't matter for **FastAPI**. It will detect the parameters by their names, types and default declarations (`Query`, `Path`, etc), it doesn't care about the order.

def Query(  # noqa: N802
    default: Annotated[
        Any,
        Doc(
            """
            Default value if the parameter field is not set.
            """
        ),
    ] = Undefined,
    *,
    default_factory: Annotated[
        Union[Callable[[], Any], None],
        Doc(
            """
            A callable to generate the default value.