本例把标准的 `dataclasses` 直接替换为 `pydantic.dataclasses`：

```{ .python .annotate hl_lines="1  5  8-11  14-17  23-25  28" }
{!../../docs_src/dataclasses/tutorial003.py!}
```

1. 本例依然要从标准的 `dataclasses` 中导入 `field`；

2. 使用 `pydantic.dataclasses` 直接替换 `dataclasses`；

3. `Author` 数据类包含 `Item` 数据类列表；

4. `Author` 数据类用于 `response_model` 参数；

5. 其它带有数据类的标准类型注解也可以作为请求体；

    本例使用的是 `Item` 数据类列表；

	// init container termination message and exit code.
	SidecarAnnotation  string
	InitContainerName  string
	InitTerminationMsg string
	InitExitCode       int

	// Label and field selectors to select pods managed by race repair.
	LabelSelectors string
	FieldSelectors string
}

func (c InstallConfig) String() string {
	var b strings.Builder

			// incorrectly believed that the old GNU format had a prefix field.
			// This is wrong and leads to an output file that mangles the
			// atime and ctime fields, which are often left unused.
			//
			// In order to continue reading tar files created by former, buggy
			// versions of Go, we skeptically parse the atime and ctime fields.
			// If we are unable to parse them and the prefix field looks like

- CertificateSigningRequest API conditions were updated:
  - a `status` field was added; this field defaults to `True`, and may only be set to `True` for `Approved`, `Denied`, and `Failed` conditions

			return err
		}
	case !f.Tag.IsEmpty():
		if err := e.EncodeElement(f.Tag, xml.StartElement{Name: xml.Name{Local: "Tag"}}); err != nil {
			return err
		}
	default:
		// Always print Prefix field when both And & Tag are empty
		if err := e.EncodeElement(f.Prefix, xml.StartElement{Name: xml.Name{Local: "Prefix"}}); err != nil {
			return err
		}
	}

	return e.EncodeToken(xml.EndElement{Name: start.Name})
}

  private final ImmutableList<Annotation> annotations;

  /**
   * An {@code AnnotatedType} instance, or {@code null} under Android VMs (possible only when using
   * the Android flavor of Guava). The field is declared with a type of {@code Object} to avoid
   * compatibility problems on Android VMs. The corresponding accessor method, however, can have the

    equalsTester = new EqualsTester();
    equalObject1 = new ValidTestObject(1, 2);
    equalObject2 = new ValidTestObject(1, 2);
    notEqualObject1 = new ValidTestObject(0, 2);
  }

  /** Test null reference yields error */
  public void testAddNullReference() {
    assertThrows(NullPointerException.class, () -> equalsTester.addEqualityGroup((Object) null));
  }

    private static final char HANKAKU_KATAKANA_LAST_CHAR = HANKAKU_KATAKANA[HANKAKU_KATAKANA.length - 1];

    @Override
    public String normalize(final String s, final String field, final String... langs) {
        if (s.length() == 0) {
            return s;
        }
        if (s.length() == 1) {
            return hankakuKatakanaToZenkakuKatakana(s.charAt(0)) + "";
        }

                    license name used for the API.
                * `identifier`: (`str`) An [SPDX](https://spdx.dev/) license expression
                    for the API. The `identifier` field is mutually exclusive of the `url`
                    field. Available since OpenAPI 3.1.0, FastAPI 0.99.0.
                * `url`: (`str`) A URL to the license used for the API. This MUST be
                    the format of a URL.

                    if (v4src != null) {
                        Field field = InputSource.class.getDeclaredField("modelId");
                        field.setAccessible(true);
                        field.set(v4src, ModelProblemUtils.toId(model));
                    }
                } catch (Throwable t) {
                    // TODO: use a lazy source ?