{!> ../../../docs_src/path_params_numeric_validations/tutorial005.py!}
    ```

## Number validations: floats, greater than and less than

Number validations also work for `float` values.

    !!! tip
        Prefer to use the `Annotated` version if possible.

    ```Python
    commons: CommonQueryParams = Depends(CommonQueryParams)
    ```

**FastAPI** provides a shortcut for these cases, in where the dependency is *specifically* a class that **FastAPI** will "call" to create an instance of the class itself.

For those specific cases, you can do the following:

Instead of writing:

=== "Python 3.8+"

Now let's jump to the fun stuff. 🎉

## Add `Query` to `Annotated` in the `q` parameter

Now that we have this `Annotated` where we can put more metadata, add `Query` to it, and set the parameter `max_length` to 50:

=== "Python 3.10+"

    ```Python hl_lines="9"
    {!> ../../../docs_src/query_params_str_validations/tutorial002_an_py310.py!}

But Python 3.7 and above provide a more advanced alternative to `threading.local`, that can also be used in the places where `threading.local` would be used, but is compatible with the new async features.

We are going to use that. It's called <a href="https://docs.python.org/3/library/contextvars.html" class="external-link" target="_blank">`contextvars`</a>.

Trong Python 3.6 hoặc lớn hơn (bao gồm Python 3.10) bạn có thể sử dụng kiểu `Union` từ `typing` và đặt trong dấu ngoặc vuông những giá trị được chấp nhận.

In Python 3.10 there's also a **new syntax** where you can put the possible types separated by a <abbr title='also called "bitwise or operator", but that meaning is not relevant here'>vertical bar (`|`)</abbr>.

                ```
                """
            ),
        ] = "0.1.0",
        openapi_url: Annotated[
            Optional[str],
            Doc(
                """
                The URL where the OpenAPI schema will be served from.

                If you set it to `None`, no OpenAPI schema will be served publicly, and
                the default automatic endpoints `/docs` and `/redoc` will also be