But by default, it all **"just works"**.

### Validation { #validation }

* Validation for most (or all?) Python **data types**, including:
    * JSON objects (`dict`).
    * JSON array (`list`) defining item types.
    * String (`str`) fields, defining min and max lengths.
    * Numbers (`int`, `float`) with min and max values, etc.

* Validation for more exotic types, like:
    * URL.
    * Email.
    * UUID.

        doc2.put("title", "Doc 2");
        doc2.put("content", "<ul><li>Item A</li><li>Item B</li></ul>");
        documents.add(doc2);

        final String result = client.testBuildContext(documents);
        assertTrue(result.contains("TitleContent 1"));
        assertTrue(result.contains("Item AItem B"));
        assertFalse(result.contains("<h1>"));
        assertFalse(result.contains("<li>"));

### `startup` イベント { #startup-event }

アプリケーションが開始される前に実行すべき関数を追加するには、イベント `"startup"` で宣言します:

{* ../../docs_src/events/tutorial001_py310.py hl[8] *}

この場合、`startup` のイベントハンドラ関数は items の「データベース」（単なる `dict`）をいくつかの値で初期化します。

イベントハンドラ関数は複数追加できます。

すべての `startup` イベントハンドラが完了するまで、アプリケーションはリクエストの受け付けを開始しません。

### `shutdown` イベント { #shutdown-event }

* el botón
* el invocable
* el código
* el commit
* el context manager
* la corrutina
* la sesión de base de datos
* el disco
* el dominio
* el motor
* el X falso
* el método HTTP GET
* el ítem
* el paquete
* el lifespan
* el lock
* el middleware
* la aplicación móvil
* el módulo
* el montaje
* la red
* el origen
* el override
* el payload
* el procesador
* la propiedad

	// The usual case is caught by Push, below, but be safe.
	for nesting := 0; nesting < 100; {
		tok := in.Stack.Next()
		switch tok {
		case '#':
			if !in.beginningOfLine {
				in.Error("'#' must be first item on line")
			}
			in.beginningOfLine = in.hash()
			in.text = "#"
			return '#'

		case scanner.Ident:
			// Is it a macro name?
			name := in.Stack.Text()
			macro := in.macros[name]

        final GregorianCalendar cal = new GregorianCalendar();

        sdf.setCalendar(cal);

        dirents = dir.listFiles();
        if (LogStream.level > 2) {
            log.println(dirents.length + " items listed");
        }
        sorted = new LinkedList();
        fmt = req.getParameter("fmt");
        if (fmt == null) {
            fmt = "col";
        }
        sort = 0;

* o botão
* o chamável
* o código
* o commit
* o gerenciador de contexto
* a corrotina
* a sessão do banco de dados
* o disco
* o domínio
* o mecanismo
* o X falso
* o método HTTP GET
* o item
* a biblioteca
* o lifespan
* o bloqueio
* o middleware
* a aplicação mobile
* o módulo
* a montagem
* a rede
* a origem
* a sobrescrita
* a carga útil
* o processador

* the callable
* the code
* the commit
* the context manager
* the coroutine
* the database session
* the disk
* the domain
* the engine
* the fake X
* the HTTP GET method
* the item
* the library
* the lifespan
* the lock
* the middleware
* the mobile application
* the module
* the mounting
* the network
* the origin
* the override
* the payload
* the processor

 *
 * <p>Advantages compared to {@code long[]}:
 *
 * <ul>
 *   <li>All the many well-known advantages of immutability (read <i>Effective Java</i>, third
 *       edition, Item 17).
 *   <li>Has the value-based (not identity-based) {@link #equals}, {@link #hashCode}, and {@link
 *       #toString} behavior you expect.

		return err
	}
	failed := false
	for res := range results {
		if res.Err != nil {
			failed = true
			batchLogIf(ctx, res.Err)
			break
		}
		result := res.Item
		sseKMS := crypto.S3KMS.IsEncrypted(result.UserDefined)
		sseS3 := crypto.S3.IsEncrypted(result.UserDefined)
		if !sseKMS && !sseS3 { // neither sse-s3 nor sse-kms disallowed
			continue
		}
		wk.Take()