# Utiliser des dataclasses { #using-dataclasses }

FastAPI est construit au‑dessus de **Pydantic**, et je vous ai montré comment utiliser des modèles Pydantic pour déclarer les requêtes et les réponses.

Mais FastAPI prend aussi en charge l'utilisation de [`dataclasses`](https://docs.python.org/3/library/dataclasses.html) de la même manière :

{* ../../docs_src/dataclasses_/tutorial001_py310.py hl[1,6:11,18:19] *}

            testTask.setTestClassesDirs(sourceSet.getOutput().getClassesDirs());
            testTask.setClasspath(sourceSet.getRuntimeClasspath());
            // if this a module or plugin, it may have an associated zip file with it's contents, add that to the test cluster
            project.getPluginManager().withPlugin("elasticsearch.internal-es-plugin", plugin -> {
                TaskProvider<Zip> bundle = project.getTasks().withType(Zip.class).named("bundlePlugin");

     * The returned list of versions is only dependent on the configured repositories and their contents.
     * The supplied request may also refer to a single concrete version rather than a version range.
     * In this case though, the result contains simply the (parsed) input version, regardless of the
     * repositories and their contents.
     *
     * @param artifact the artifact for which to resolve the versions

    </dependency>

    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
    </dependency>
    <dependency>
      <groupId>commons-cli</groupId>
      <artifactId>commons-cli</artifactId>
    </dependency>
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
      <optional>true</optional>
    </dependency>

    /**
     * Get the repository metadata associated with this marker.
     *
     * @return the metadata, or <code>null</code> if none loaded
     */
    Metadata getMetadata();

    /**
     * Set the metadata contents.
     *
     * @param metadata the metadata
     */
    void setMetadata(Metadata metadata);

    /**
     * Whether this represents a snapshot.
     *
     * @return if it is a snapshot
     */

* `close()`：关闭文件。

由于这些方法都是 `async` 方法，你需要对它们使用 await。

例如，在 `async` *路径操作函数* 内，你可以这样获取内容：

```Python
contents = await myfile.read()
```

如果是在普通 `def` *路径操作函数* 内，你可以直接访问 `UploadFile.file`，例如：

```Python
contents = myfile.file.read()
```

/// note | `async` 技术细节

当你使用这些 `async` 方法时，**FastAPI** 会在线程池中运行相应的文件方法并等待其完成。

///

/// note | Starlette 技术细节

import org.gradle.api.file.FileSystemOperations
import org.gradle.api.tasks.Input
import org.gradle.api.tasks.TaskAction

import javax.inject.Inject
import java.nio.charset.Charset

/**
 * A task which will run ant commands.
 *
 * Logging for the task is customizable for subclasses by overriding makeLogger.
 */
public abstract class AntTask extends DefaultTask {

    /**
     * A buffer that will contain the output of the ant code run,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.suggest.index.contents;

import static org.codelibs.opensearch.runner.OpenSearchRunner.newConfigs;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;

    * 當你已經執行過 `await myfile.read()`，之後需要再次讀取內容時特別有用。
* `close()`：關閉檔案。

由於這些都是 `async` 方法，你需要以 await 呼叫它們。

例如，在 `async` 的路徑操作函式中可這樣讀取內容：

```Python
contents = await myfile.read()
```

若是在一般的 `def` 路徑操作函式中，你可以直接存取 `UploadFile.file`，例如：

```Python
contents = myfile.file.read()
```

/// note | `async` 技術細節

當你使用這些 `async` 方法時，**FastAPI** 會在執行緒池中執行對應的檔案方法並等待結果。

///

/// note | Starlette 技術細節

 */
package gradlebuild.docs.dsl.docbook;

import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.regex.Pattern;

/**
 * Converts the main description of a javadoc comment into a stream of tokens.
 */
class BasicJavadocLexer implements JavadocLexer {
    private static final Pattern HTML_ELEMENT = Pattern.compile("(?s)<\\\\?[^<]+?>");