<img src="/img/python-types/image06.png">

Notice that this means "`one_person` is an **instance** of the class `Person`".

It doesn't mean "`one_person` is the **class** called `Person`".

## Pydantic models

<a href="https://docs.pydantic.dev/" class="external-link" target="_blank">Pydantic</a> is a Python library to perform data validation.

```Python hl_lines="1  7-12  19-20"
{!../../docs_src/dataclasses/tutorial001.py!}
```

Das ist dank **Pydantic** ebenfalls möglich, da es <a href="https://pydantic-docs.helpmanual.io/usage/dataclasses/#use-of-stdlib-dataclasses-with-basemodel" class="external-link" target="_blank">`dataclasses` intern unterstützt</a>.

        ArrayList<ProducedArtifact> result = new ArrayList<>(2);
        result.add(session.getArtifact(ProducedArtifact.class, pomArtifact));
        if (!ArtifactIdUtils.equalsVersionlessId(pomArtifact, projectArtifact)) {
            result.add(session.getArtifact(ProducedArtifact.class, projectArtifact));
        }
        return Collections.unmodifiableList(result);
    }

    @Nonnull
    @Override

👆 💪 👀 🌖 ℹ <a href="https://www.starlette.io/background/" class="external-link" target="_blank">💃 🛂 🩺 🖥 📋</a>.

## ⚠

🚥 👆 💪 🎭 🏋️ 🖥 📊 &amp; 👆 🚫 🎯 💪 ⚫️ 🏃 🎏 🛠️ (🖼, 👆 🚫 💪 💰 💾, 🔢, ♒️), 👆 💪 💰 ⚪️➡️ ⚙️ 🎏 🦏 🧰 💖 <a href="https://docs.celeryq.dev" class="external-link" target="_blank">🥒</a>.

But FastAPI also supports using <a href="https://docs.python.org/3/library/dataclasses.html" class="external-link" target="_blank">`dataclasses`</a> the same way:

{* ../../docs_src/dataclasses/tutorial001.py hl[1,7:12,19:20] *}

This is still supported thanks to **Pydantic**, as it has <a href="https://docs.pydantic.dev/latest/concepts/dataclasses/#use-of-stdlib-dataclasses-with-basemodel" class="external-link" target="_blank">internal support for `dataclasses`</a>.

import org.lastaflute.web.Execute;
import org.lastaflute.web.response.JsonResponse;

/**
 * @author shinsuke
 */
public class ApiAdminAccesstokenAction extends FessApiAdminAction {

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

    // ===================================================================================

import org.lastaflute.web.response.JsonResponse;

import jakarta.annotation.Resource;

/**
 * @author Keiichi Watanabe
 */
public class ApiAdminReqheaderAction extends FessApiAdminAction {

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

    // ===================================================================================

import org.lastaflute.web.response.JsonResponse;

import jakarta.annotation.Resource;

/**
 * @author Keiichi Watanabe
 */
public class ApiAdminWebauthAction extends FessApiAdminAction {

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

    // ===================================================================================

    // ===================================================================================
    //                                                                        Assist Class
    //                                                                        ============
    public class DocMeta implements Serializable {

        private static final long serialVersionUID = 1L;

        protected String id;

        protected Long version;

import com.google.common.collect.ImmutableList;
import com.google.gson.annotations.SerializedName;
import japicmp.model.JApiMethod;

import java.util.List;
import java.util.Objects;

public class UpgradedProperty {
    private final String containingType;
    private final String propertyName;
    private final String methodName;
    private final String methodDescriptor;

    /**