{* ../../docs_src/dataclasses/tutorial003.py hl[1,5,8:11,14:17,23:25,28] *}

1. Wir importieren `field` weiterhin von Standard-`dataclasses`.

2. `pydantic.dataclasses` ist ein direkter Ersatz für `dataclasses`.

3. Die Datenklasse `Author` enthält eine Liste von `Item`-Datenklassen.

...без додавання обов’язкового параметра `needy`, Ви побачите помилку:

```JSON
{
  "detail": [
    {
      "type": "missing",
      "loc": [
        "query",
        "needy"
      ],
      "msg": "Field required",
      "input": null
    }
  ]
}
```

Оскільки `needy` є обов’язковим параметром, вам потрібно вказати його в URL:

```
http://127.0.0.1:8000/items/foo-item?needy=sooooneedy
```

```JSON
{
    "detail": [
        {
            "loc": [
                "query",
                "needy"
            ],
            "msg": "field required",
            "type": "value_error.missing"
        }
    ]
}
```

Поскольку `needy` является обязательным параметром, вам необходимо указать его в URL-адресе:

```

* API: the metadata.selfLink field is deprecated in individual and list objects. It will no longer be returned starting in v1.20, and the field will be removed entirely in v1.21. ([#80978](https://github.com/kubernetes/kubernetes/pull/80978), [@wojtek-t](https://github.com/wojtek-t))

    /**
     * Flag to return only a single directory entry.
     */
    public static final byte SMB2_RETURN_SINGLE_ENTRY = 0x2;

    /**
     * Flag indicating that the file index field contains a valid index.
     */
    public static final byte SMB2_INDEX_SPECIFIED = 0x4;

    /**
     * Flag to reopen the directory enumeration.
     */
    public static final byte SMB2_REOPEN = 0x10;

* dockershim now makes an Image's Labels available in the Info field of ImageStatusResponse ([#58036](https://github.com/kubernetes/kubernetes/pull/58036), [@shlevy](https://github.com/shlevy))

* Support GetLabelsForVolume in OpenStack Provider ([#58871](https://github.com/kubernetes/kubernetes/pull/58871), [@edisonxiang](https://github.com/edisonxiang))

        }
    }

    public void test_searchEngineClient_injection() {
        // Test SearchEngineClient field injection
        ThumbnailGenerator generator = new ThumbnailGenerator();
        assertNull(generator.searchEngineClient);

        // After proper initialization, it should be injected

Guava provides two different "flavors": one for use on a (Java 8+) JRE and one
for use on Android or by any library that wants to be compatible with Android.
These flavors are specified in the Maven version field as either `33.4.8-jre` or
`33.4.8-android`. For more about depending on Guava, see
[using Guava in your build].

To add a dependency on Guava using Maven, use the following:

```xml
<dependency>

            this.subject = subject;
            this.failOnRefresh = failOnRefresh;
        }

        @Override
        public TestCredentials clone() {
            // Return a shallow copy with the same field values
            return new TestCredentials(this.domain, this.anonymous, this.guest, this.subject, this.failOnRefresh);
        }

        @Override

        assertTrue(exception instanceof Exception);
        assertTrue(exception instanceof Throwable);
    }

    public void test_serialization() {
        // Test that the exception has the correct serialVersionUID field
        ScriptEngineException exception = new ScriptEngineException("Serialization test");

        // Verify the exception can be created and basic properties work
        assertNotNull(exception);