## オプショナルなパラメータ { #optional-parameters }

同様に、デフォルト値を `None` とすることで、オプショナルなクエリパラメータを宣言できます:

{* ../../docs_src/query_params/tutorial002_py310.py hl[7] *}

この場合、関数パラメータ `q` はオプショナルとなり、デフォルトでは `None` になります。

/// check | 確認

パスパラメータ `item_id` はパスパラメータであり、`q` はそれとは違ってクエリパラメータであると判別できるほど**FastAPI** が賢いということにも注意してください。

///

## クエリパラメータの型変換 { #query-parameter-type-conversion }

`bool` 型も宣言でき、変換されます:

{* ../../docs_src/metadata/tutorial004_py310.py hl[21,26] *}

/// info | 정보

태그에 대한 자세한 내용은 [경로 처리 구성](path-operation-configuration.md#tags)에서 읽어보세요.

///

### 문서 확인 { #check-the-docs }

이제 문서를 확인하면 모든 추가 메타데이터가 표시됩니다:

<img src="/img/tutorial/metadata/image02.png">

### 태그 순서 { #order-of-tags }

각 태그 메타데이터 딕셔너리의 순서는 문서 UI에 표시되는 순서도 정의합니다.

/// tip | 提示

注意，不能把路由本身（`invoices_callback_router`）传递给 `callbacks=`，要传递 `invoices_callback_router.routes` 中的 `.routes` 属性。

///

### 查看文档 { #check-the-docs }

现在，启动应用并打开 [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs)。

就能看到文档的*路径操作*已经包含了**回调**的内容以及*外部 API*：

-   Linux, MacOS, and Windows machines (these pool definitions are internal)
-   x86 and arm64
-   CPU-only, or with NVIDIA CUDA support (Linux only), or with TPUs

## How to Test Your Changes to TensorFlow

You may check how your changes will affect TensorFlow by:

1. Creating a PR and observing the presubmit test results
2. Running the CI scripts locally, as explained below

     * <code>false</code> otherwise.
     *
     * @param type
     *            the type to check. Cannot be null.
     * @param clazz
     *            the class to check against. Cannot be null.
     * @return <code>true</code> if the raw type of <code>type</code> can be assigned to <code>clazz</code>
     */

   * @throws UnsupportedCharsetException if a charset value is present, but no support is available
   *     in this instance of the Java virtual machine
   */
  public Optional<Charset> charset() {
    // racy single-check idiom, this is safe because Optional is immutable.
    Optional<Charset> local = parsedCharset;
    if (local == null) {
      String value = null;
      local = Optional.absent();

    }

    // #for_now jflute to suppress CVE-2014-0050 even if commons-fileupload is older than safety version (2024/09/08)
    // but if you use safety version, this extension is basically unneeded (or you can use it as double check)
    protected void checkBoundarySize(final String contentType, final byte[] boundary) {
        final int boundarySize = boundary.length;
        final int limitSize = getBoundaryLimitSize();

to introduce new properties on a task, extension or domain object that use plain getters and setters.  It is also not acceptable to add setters that take a Provider.

Note that when adding a lazy property to an existing class, you need to check if instances of the class are instantiated via ObjectFactory. Most classes are instantiated this way, but it's possible that a class without any lazy properties was never updated to use it. A tell-tale sign that an object is not instantiated via the...

            parameter.setRequired(Boolean.parseBoolean(required));

            PlexusConfiguration editableConfig = d.getChild("editable");

            // we need the null check for pre-build legacy plugins...
            if (editableConfig != null) {
                String editable = d.getChild("editable").getValue();

//// tab | Тест

/// info | Інформація
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/// note | Примітка
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/// note | Технічні деталі
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/// check | Перевірте
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/// tip | Порада
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/// warning | Попередження
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/// danger | Обережно
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////