///

## Type Hints with Metadata Annotations

Python also has a feature that allows putting **additional <abbr title="Data about the data, in this case, information about the type, e.g. a description.">metadata</abbr>** in these type hints using `Annotated`.

//// tab | Python 3.9+

In Python 3.9, `Annotated` is part of the standard library, so you can import it from `typing`.

			<groupId>org.glassfish.jersey.core</groupId>
			<artifactId>jersey-common</artifactId>
			<version>${jersey.common.version}</version>
			<exclusions>
				<exclusion>
					<groupId>jakarta.annotation</groupId>
					<artifactId>jakarta.annotation-api</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
		<dependency>
			<groupId>jakarta.activation</groupId>
			<artifactId>jakarta.activation-api</artifactId>

```

////

//// tab | Python 3.10+ non-Annotated

/// tip

Prefer to use the `Annotated` version if possible.

///

```Python hl_lines="7  48  55-56  59-60  69-75"
{!> ../../docs_src/security/tutorial004_py310.py!}
```

////

//// tab | Python 3.8+ non-Annotated

/// tip

Prefer to use the `Annotated` version if possible.

///

    ] = None,
    max_length: Annotated[
        Optional[int],
        Doc(
            """
            Maximum length for strings.
            """
        ),
    ] = None,
    pattern: Annotated[
        Optional[str],
        Doc(
            """
            RegEx pattern for strings.
            """
        ),
    ] = None,
    regex: Annotated[
        Optional[str],
        Doc(

    ## Example

    ```python
    from typing import Annotated

    from fastapi import Depends, FastAPI
    from fastapi.security import OAuth2PasswordRequestForm

    app = FastAPI()


    @app.post("/login")
    def login(form_data: Annotated[OAuth2PasswordRequestForm, Depends()]):
        data = {}
        data["scopes"] = []

		<delete dir="${thumbnail.dir}/lib" />
		<mkdir dir="${thumbnail.dir}/lib" />
		<!-- annotation-api -->
		<antcall target="install.env.jar">
			<param name="repo.url" value="${maven.release.repo.url}" />
			<param name="jar.groupId" value="jakarta/annotation" />
			<param name="jar.artifactId" value="jakarta.annotation-api" />
			<param name="jar.version" value="2.1.1" />
			<param name="file.version" value="2.1.1" />

```

...the bigger the codebase, the more noticeable it is.

Now you can create an annotated dependency once, like this:

```Python
CurrentUser = Annotated[User, Depends(get_current_user)]
```

And then you can reuse this `Annotated` dependency:

```Python
CurrentUser = Annotated[User, Depends(get_current_user)]


@app.get("/items/")
def read_items(user: CurrentUser):

    val configurationCacheReport = "org.gradle.buildtool.internal:configuration-cache-report:$configurationCacheReportVersion"
    val develocityTestAnnotation = "com.gradle:develocity-testing-annotations"
    val eclipseSisuPlexus = "org.eclipse.sisu:org.eclipse.sisu.plexus"
    val errorProneAnnotations = "com.google.errorprone:error_prone_annotations"
    val fastutil = "it.unimi.dsi:fastutil"

import org.codelibs.nekohtml.parsers.DOMParser;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

import jakarta.annotation.PostConstruct;

public class FessXpathTransformer extends XpathTransformer implements FessTransformer {

    private static final Logger logger = LogManager.getLogger(FessXpathTransformer.class);