Imaginez que vous vouliez que votre paramètre se nomme `item-query`.

Comme dans la requête :

```
http://127.0.0.1:8000/items/?item-query=foobaritems
```

Mais `item-query` n'est pas un nom de variable valide en Python.

Le nom le plus proche serait `item_query`.

Mais vous avez vraiment envie que ce soit exactement `item-query`...

En este ejemplo, cuando el cliente solicita un ítem por un ID que no existe, lanza una excepción con un código de estado de `404`:

{* ../../docs_src/handling_errors/tutorial001.py hl[11] *}

### El response resultante

Si el cliente solicita `http://example.com/items/foo` (un `item_id` `"foo"`), ese cliente recibirá un código de estado HTTP de 200, y un response JSON de:

```JSON
{
  "item": "The Foo Wrestlers"
}
```

Neste exemplo, quando o cliente pede, na requisição, por um item cujo ID não existe, a exceção com o status code `404` é lançada:

{* ../../docs_src/handling_errors/tutorial001.py hl[11] *}

### A response resultante


Se o cliente faz uma requisição para `http://example.com/items/foo` (um `item_id` `"foo"`), esse cliente receberá um HTTP status code 200, e uma resposta JSON:


```
{
  "item": "The Foo Wrestlers"
}
```

        for (Map<String, String> item : dicts) {
            assertTrue(item.containsKey("id"));
            assertTrue(item.containsKey("type"));
            if (getDictType().equals(item.get("type"))) {
                dictId = item.get("id");
                return;
            }
        }

        fail();
    }

    @Override

                                            <tbody>
                                            <c:forEach var="data" varStatus="s"
                                                       items="${pathMappingItems}">
                                                <tr
                                                        data-href="${contextPath}/admin/pathmap/details/4/${f:u(data.id)}">

     * for finalName directly in the plugin configuration section. It is also useful to ensure that - for example - a
     * List-typed parameter which expects items of type Artifact doesn't get a List full of Strings.
     *
     * @return <code>true</code> if the user should not be allowed to configure the parameter directly
     */
    boolean readonly() default false;

And Python has a special data type for sets of unique items, the `set`.

Then we can declare `tags` as a set of strings:

{* ../../docs_src/body_nested_models/tutorial003_py310.py hl[12] *}

With this, even if you receive a request with duplicate data, it will be converted to a set of unique items.

And whenever you output that data, even if the source had duplicates, it will be output as a set of unique items.

    private static class MockNamedNodeMap implements NamedNodeMap {
        private final Map<String, Node> items = new HashMap<>();

        public void setNamedItem(String name, Node node) {
            items.put(name, node);
        }

        @Override
        public Node getNamedItem(String name) {
            return items.get(name);
        }

        @Override
        public Node setNamedItem(Node arg) {

			<c:forEach var="p" varStatus="s"
				items="${pager.pageNumberList}">
				<li
					<c:if test="${p == pager.currentPageNumber}">class="page-item active"</c:if>><la:link
						styleClass="page-link"
						href="list/${p}">${p}</la:link></li>
			</c:forEach>
			<c:if test="${pager.existNextPage}">
				<li class="page-item"><la:link
						styleClass="page-link"
						href="list/${pager.currentPageNumber + 1}">

                    "message": {
                        "title": "Message",
                        "type": "string"
                    }
                }
            },
            "Item": {
                "title": "Item",
                "required": [
                    "id",
                    "value"
                ],
                "type": "object",
                "properties": {