由于列表是带有"子类型"的类型，所以我们把子类型放在方括号中：

```Python hl_lines="4"
{!../../docs_src/python_types/tutorial006.py!}
```

这表示："变量 `items` 是一个 `list`，并且这个列表里的每一个元素都是 `str`"。

这样，即使在处理列表中的元素时，你的编辑器也可以提供支持。

没有类型，几乎是不可能实现下面这样：

<img src="https://fastapi.tiangolo.com/img/python-types/image05.png">

注意，变量 `item` 是列表 `items` 中的元素之一。

而且，编辑器仍然知道它是一个 `str`，并为此提供了支持。

#### 元组和集合

声明 `tuple` 和 `set` 的方法也是一样的：

///

```mermaid
graph TB

query_extractor(["query_extractor"])
query_or_cookie_extractor(["query_or_cookie_extractor"])

read_query["/items/"]

query_extractor --> query_or_cookie_extractor --> read_query
```

## Использование одной и той же зависимости несколько раз

///

```mermaid
graph TB

query_extractor(["query_extractor"])
query_or_cookie_extractor(["query_or_cookie_extractor"])

read_query["/items/"]

query_extractor --> query_or_cookie_extractor --> read_query
```

## Utilizando a mesma dependência múltiplas vezes

	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
	"sigs.k8s.io/yaml"

	"istio.io/istio/istioctl/pkg/cli"
	"istio.io/istio/pkg/test/util/assert"
)

const (
	validDeploymentList = `
apiVersion: v1
items:
- apiVersion: apps/v1
  kind: Deployment
  metadata:
    labels:
      app: hello
      version: v1
    name: hello-v1
  spec:
    replicas: 1
    template:
      metadata:
        labels:

///

```Python hl_lines="9"
{!> ../../docs_src/query_params_str_validations/tutorial011.py!}
```

////

Затем, получив такой URL:

```
http://localhost:8000/items/?q=foo&q=bar
```

вы бы получили несколько значений (`foo` и `bar`), которые относятся к параметру `q`, в виде Python `list` внутри вашей *функции обработки пути*, в *параметре функции* `q`.

  private static final int SHORT_MASK = (1 << Short.SIZE) - 1; // 2^16 - 1 = 65_535

  /**
   * Returns the power of 2 hashtable size required to hold the expected number of items or the
   * minimum hashtable size, whichever is greater.
   */
  static int tableSize(int expectedSize) {
    // We use entries next == 0 to indicate UNSET, so actual capacity is 1 less than requested.

. }} - secret: name: {{ template "minio.secretName" . }} {{- range .Values.users }} {{- if .existingSecret }} - secret: name: {{ .existingSecret }} items: - key: {{ .existingSecretKey }} path: secrets/{{ .accessKey }} {{- end }} {{- end }} {{- if .Values.tls.enabled }} - name: cert-secret-volume-mc secret: secretName: {{ .Values.tls.certSecret }} items: - key: {{ .Values.tls.publicCrt }} path: CAs/public.crt {{ end }} containers: - name: minio-mc image: "{{ .Values.mcImage.repository }}:{{ .Values.mcImage.tag...

대괄호 안의 내부 타입은 "타입 매개변수(type paramters)"라고 합니다.

이번 예제에서는 `str`이 `List`에 들어간 타입 매개변수 입니다.

///

이는 "`items`은 `list`인데, 배열에 들어있는 아이템 각각은 `str`이다"라는 뜻입니다.

이렇게 함으로써, 에디터는 배열에 들어있는 아이템을 처리할때도 도움을 줄 수 있게 됩니다:

<img src="/img/python-types/image05.png">

타입이 없으면 이건 거의 불가능이나 다름 없습니다.

변수 `item`은 `items`의 개별 요소라는 사실을 알아두세요.

그리고 에디터는 계속 `str`라는 사실을 알고 도와줍니다.

#### `Tuple`과 `Set`

 *
 * <ul>
 *   <li>"{@code [group }<i>i</i>{@code , item }<i>j</i>{@code ]}" refers to the
 *       <i>j</i><sup>th</sup> item in the <i>i</i><sup>th</sup> equality group, where both equality
 *       groups and the items within equality groups are numbered starting from 1. When either a
 *       constructor argument or an equal object is provided, that becomes group 1.
 * </ul>
 *
 * @author Jim McMaster
 * @author Jige Yu
 * @since 10.0

* Ability to serially process updates received from a variety of different sources. This avoids need for other synchronization mechanisms like mutexes.
* Correctness at startup; with the sequencing above, items are only processed once all informers are synced. This means queries will not return stale data at startup.
* Deduping of identical events
* Automatic retrying of failed events (configurable)