public static final String ELEVATE_WORD_BOOST = "boost";
    /** Key for elevate word reading. */
    public static final String ELEVATE_WORD_READING = "reading";
    /** Key for elevate word fields. */
    public static final String ELEVATE_WORD_FIELDS = "fields";
    /** Key for elevate word tags. */
    public static final String ELEVATE_WORD_TAGS = "tags";
    /** Key for elevate word roles. */

也許你要啟動新版本，或只是不想再跑它了。🤷

///

### Lifespan 函式 { #lifespan-function }

首先要注意的是，我們定義了一個帶有 `yield` 的 async 函式。這和帶有 `yield` 的依賴（Dependencies）非常相似。

{* ../../docs_src/events/tutorial003_py310.py hl[14:19] *}

函式在 `yield` 之前的部分，會在應用啟動前先執行。

`yield` 之後的部分，會在應用結束後再執行。

### 非同步內容管理器（Async Context Manager） { #async-context-manager }

你會看到這個函式被 `@asynccontextmanager` 裝飾。

它會把函式轉換成所謂的「**非同步內容管理器（async context manager）**」。

/// tip | 豆知識

async 関数内からブロッキングなコードを呼び出す必要がある場合、あるいはブロッキングな関数内から async 関数を呼び出す必要がある場合は、FastAPI の兄弟ライブラリである [Asyncer](https://asyncer.tiangolo.com) を利用できます。

///

### `yield from` { #yield-from }

ファイルライクオブジェクトのようなものをイテレートして各要素に対して `yield` している場合、`for` ループを省略して、`yield from` で各要素をそのまま送ることもできます。

これは FastAPI 固有ではなく単なる Python の機能ですが、知っておくと便利な小ワザです。 😎

	fields := strings.Split(releaseTag, ".")
	if len(fields) < 2 || len(fields) > 4 {
		return releaseTime, fmt.Errorf("%s is not a valid release tag", releaseTag)
	}
	if fields[0] != "RELEASE" {
		return releaseTime, fmt.Errorf("%s is not a valid release tag", releaseTag)
	}
	return time.Parse(MinioReleaseTagTimeLayout, fields[1])
}

class CallableGenDependency:
    def __call__(self, value: str) -> Generator[str, None, None]:
        yield value


class AsyncCallableDependency:
    async def __call__(self, value: str) -> str:
        return value


class AsyncCallableGenDependency:
    async def __call__(self, value: str) -> AsyncGenerator[str, None]:
        yield value


class MethodsDependency:
    def synchronous(self, value: str) -> str:

      or contributory patent infringement, then any patent licenses
      granted to You under this License for that Work shall terminate
      as of the date such litigation is filed.

   4. Redistribution. You may reproduce and distribute copies of the
      Work or Derivative Works thereof in any medium, with or without
      modifications, and in Source or Object form, provided that You

      or contributory patent infringement, then any patent licenses
      granted to You under this License for that Work shall terminate
      as of the date such litigation is filed.

   4. Redistribution. You may reproduce and distribute copies of the
      Work or Derivative Works thereof in any medium, with or without
      modifications, and in Source or Object form, provided that You

새 버전을 시작해야 할 수도 있고, 그냥 실행하는 게 지겨워졌을 수도 있습니다. 🤷

///

### Lifespan 함수 { #lifespan-function }

먼저 주목할 점은 `yield`를 사용하여 비동기 함수를 정의하고 있다는 것입니다. 이는 `yield`를 사용하는 의존성과 매우 유사합니다.

{* ../../docs_src/events/tutorial003_py310.py hl[14:19] *}

함수의 첫 번째 부분, 즉 `yield` 이전의 코드는 애플리케이션이 시작되기 **전에** 실행됩니다.

그리고 `yield` 이후의 부분은 애플리케이션이 종료된 **후에** 실행됩니다.

### 비동기 컨텍스트 매니저 { #async-context-manager }

 * Provides form fields and methods for handling search requests in the web interface.
 * Contains validation constraints and convenience methods for parameter processing.
 */
public class SearchForm extends SearchRequestParams {

    /**
     * Map of additional search fields with their values.
     */
    public Map<String, String[]> fields = new HashMap<>();

    /**

@app.post("/chat/stream", response_class=EventSourceResponse)
async def stream_chat(prompt: Prompt) -> AsyncIterable[ServerSentEvent]:
    words = prompt.text.split()
    for word in words:
        yield ServerSentEvent(data=word, event="token")