Aber FastAPI unterstützt auf die gleiche Weise auch die Verwendung von <a href="https://docs.python.org/3/library/dataclasses.html" class="external-link" target="_blank">`dataclasses`</a>:

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

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.internal.http2

/** http://tools.ietf.org/html/draft-ietf-httpbis-http2-17#section-7 */
enum class ErrorCode constructor(val httpCode: Int) {
  /** Not an error!  */
  NO_ERROR(0),

  PROTOCOL_ERROR(1),

  INTERNAL_ERROR(2),

  FLOW_CONTROL_ERROR(3),

  SETTINGS_TIMEOUT(4),

```Python
item: Item = Body(embed=True)
```

so wie in:

=== "Python 3.10+"

    ```Python hl_lines="17"
    {!> ../../../docs_src/body_multiple_params/tutorial005_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="17"
    {!> ../../../docs_src/body_multiple_params/tutorial005_an_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="18"

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:

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

* 一个 `limit` 查询参数，是 `int` 类型，默认值为 `100`。

在两个例子下，数据都将被转换、验证、在 OpenAPI schema 上文档化，等等。

## 使用它

现在，您可以使用这个类来声明你的依赖项了。

=== "Python 3.10+"

    ```Python hl_lines="17"
    {!> ../../../docs_src/dependencies/tutorial002_py310.py!}
    ```

=== "Python 3.6+"

    ```Python hl_lines="19"
    {!> ../../../docs_src/dependencies/tutorial002.py!}
    ```

.its/b/pom.xml 4.0.0 org.apache.maven.its b 0.1 jar Maven Integration Test :: Dummy Artifact maven-core-it file:///${basedir}/repo org.apache.maven.its a 0.1 META-INF/maven/org.apache.maven.its/b/pom.properties #Generated by Maven #Sat Oct 24 00:28:17 CEST 2009 version=0.1 groupId=org.apache.maven.its artifactId=b...

{{- $statements_length := len .statements -}} {{- $statements_length := sub $statements_length 1 -}} { "Version": "2012-10-17", "Statement": [ {{- range $i, $statement := .statements }} { "Effect": "{{ $statement.effect | default "Allow" }}", "Action": [ "{{ $statement.actions | join "\",\n\"" }}" ]{{ if $statement.resources }}, "Resource": [ "{{ $statement.resources | join "\",\n\"" }}" ]{{ end }} {{- if $statement.conditions }} {{- $condition_len := len $statement.conditions }} {{- $condition_len...

```Python
item: Item = Body(embed=True)
```

比如：

=== "Python 3.10+"

    ```Python hl_lines="17"
    {!> ../../../docs_src/body_multiple_params/tutorial005_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="17"
    {!> ../../../docs_src/body_multiple_params/tutorial005_an_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="18"

            return false;
        }

        id = artifact.getGroupId() + ':' + id;

        return !excludes.contains(id);
    }

    @Override
    public int hashCode() {
        int hash = 17;
        hash = hash * 31 + excludes.hashCode();
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

    1L * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10 * 11 * 12 * 13 * 14 * 15 * 16 * 17,
    1L * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10 * 11 * 12 * 13 * 14 * 15 * 16 * 17 * 18,
    1L * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10 * 11 * 12 * 13 * 14 * 15 * 16 * 17 * 18 * 19,
    1L * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10 * 11 * 12 * 13 * 14 * 15 * 16 * 17 * 18 * 19 * 20
  };

  /**