Response model’inizde şu şekilde default değerler olabilir:

{* ../../docs_src/response_model/tutorial004_py310.py hl[9,11:12] *}

* `description: Union[str, None] = None` (veya Python 3.10’da `str | None = None`) için default `None`’dır.
* `tax: float = 10.5` için default `10.5`’tir.
* `tags: List[str] = []` için default, boş bir list’tir: `[]`.

Seu modelo de resposta pode ter valores padrão, como:

{* ../../docs_src/response_model/tutorial004_py310.py hl[9,11:12] *}

* `description: Union[str, None] = None` (ou `str | None = None` no Python 3.10) tem um padrão de `None`.
* `tax: float = 10.5` tem um padrão de `10.5`.
* `tags: List[str] = []` tem um padrão de uma lista vazia: `[]`.

## 响应模型的编码参数 { #response-model-encoding-parameters }

你的响应模型可以具有默认值，例如：

{* ../../docs_src/response_model/tutorial004_py310.py hl[9,11:12] *}

* `description: Union[str, None] = None`（或在 Python 3.10 中的 `str | None = None`）默认值为 `None`。
* `tax: float = 10.5` 默认值为 `10.5`。
* `tags: List[str] = []` 默认值为一个空列表：`[]`。

但如果它们并没有被实际存储，你可能希望在结果中省略这些默认值。

{* ../../docs_src/response_model/tutorial003_04_py310.py hl[8] *}

...これは、型アノテーションがPydantic型ではなく、単一の `Response` クラス（またはサブクラス）でもないために失敗します。`Response` と `dict` の間のunion（どちらか）になっているからです。

### レスポンスモデルを無効化する { #disable-response-model }

上の例を続けると、FastAPIが実行するデフォルトのデータ検証、ドキュメント化、フィルタリングなどを行いたくないこともあるでしょう。

しかし、エディタや型チェッカー（例: mypy）などのツール支援を得るために、関数の戻り値の型アノテーションは残したいかもしれません。

      assertThat(removalNotifications.get("b" + i)).isEqualTo("b" + i);
    }

    // Each of the values added to the map should either still be there, or have seen a removal
    // notification.
    assertThat(Sets.union(cache.asMap().keySet(), removalNotifications.keySet()))
        .isEqualTo(expectedKeys);
    assertThat(cache.asMap().keySet()).containsNoneIn(removalNotifications.keySet());
    threadPool.shutdown();

      assertThat(removalNotifications.get("b" + i)).isEqualTo("b" + i);
    }

    // Each of the values added to the map should either still be there, or have seen a removal
    // notification.
    assertThat(Sets.union(cache.asMap().keySet(), removalNotifications.keySet()))
        .isEqualTo(expectedKeys);
    assertThat(cache.asMap().keySet()).containsNoneIn(removalNotifications.keySet());
    threadPool.shutdown();

- Correct openapi schema union validation for the PodGroupPolicy struct in scheduling v1alpha1 ([#136424](https://github.com/kubernetes/kubernetes/pull/136424), [@JoelSpeed](https://github.com/JoelSpeed)) [SIG API Machinery and Scheduling]

	list := make([]string, 0, n)
	for i := 0; i < n; i++ {
		emb := typ.EmbeddedType(i)
		switch emb := emb.(type) {
		case *types.Interface:
			list = append(list, w.sortedEmbeddeds(emb)...)
		case *types.Union:
			var buf bytes.Buffer
			nu := emb.Len()
			for i := 0; i < nu; i++ {
				if i > 0 {
					buf.WriteString(" | ")
				}
				term := emb.Term(i)
				if term.Tilde() {
					buf.WriteByte('~')

			if _, found := cache.iamPolicyDocsMap[p]; !found {
				err = errNoSuchPolicy
				return updatedAt, addedOrRemoved, effectivePolicies, err
			}
		}
		newPolicySet = existingPolicySet.Union(policiesToUpdate)
	} else {
		// policies to detach => inputPolicies ∩ existing (intersection)
		policiesToUpdate = policiesToUpdate.Intersection(existingPolicySet)

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