```Python hl_lines="1"
{!> ../../docs_src/python_types/tutorial008b_py310.py!}
```

这表示 `item` 可以是 `int` 或 `str`。

#### 可能为 `None` { #possibly-none }

你可以声明一个值的类型是某种类型（比如 `str`），但它也可能是 `None`。

//// tab | Python 3.10+

```Python hl_lines="1"
{!> ../../docs_src/python_types/tutorial009_py310.py!}
```

////

使用 `str | None` 而不是仅仅 `str`，可以让编辑器帮助你发现把值当成总是 `str` 的错误（实际上它也可能是 `None`）。

但就產生用戶端而言，我們可以在產生前**修改** OpenAPI 的操作 ID，來讓方法名稱更**簡潔**、更**乾淨**。

我們可以把 OpenAPI JSON 下載到 `openapi.json` 檔案，然後用像這樣的腳本**移除該標籤前綴**：

{* ../../docs_src/generate_clients/tutorial004_py310.py *}

//// tab | Node.js

```Javascript
{!> ../../docs_src/generate_clients/tutorial004.js!}
```

////

如此一來，操作 ID 會從 `items-get_items` 之類的字串，變成單純的 `get_items`，讓用戶端產生器能產生更簡潔的方法名稱。

				"text/prs.lines.tag",
				"text/red",
				"text/rfc822-headers",
				"text/richtext",
				"text/rtp-enc-aescm128",
				"text/rtx",
				"text/sgml",
				"text/t140",
				"text/tab-separated-values",
				"text/troff",
				"text/ulpfec",
				"text/uri-list",
				"text/vnd.abc",
				"text/vnd.curl",
				"text/vnd.curl.dcurl",
				"text/vnd.curl.scurl",
				"text/vnd.curl.mcurl",

the change has been submitted internally, your pull request will be merged
automatically on GitHub.

If you want to contribute, start working through the TensorFlow codebase,
navigate to the
[GitHub "issues" tab](https://github.com/tensorflow/tensorflow/issues) and start
looking through interesting issues. If you are not sure of where to start, then
start by trying one of the smaller/easier issues here i.e.

Обратите внимание, что в приведенном выше коде мы два раза пишем `CommonQueryParams`:

//// tab | Python 3.10+

```Python
commons: Annotated[CommonQueryParams, Depends(CommonQueryParams)]
```

////

//// tab | Python 3.10+ без Annotated

/// tip | Подсказка

Рекомендуется использовать версию с `Annotated`, если возможно.

///

```Python

## Anotación de tipos vs `Depends` { #type-annotation-vs-depends }

Nota cómo escribimos `CommonQueryParams` dos veces en el código anterior:

//// tab | Python 3.10+

```Python
commons: Annotated[CommonQueryParams, Depends(CommonQueryParams)]
```

////

//// tab | Python 3.10+ sin `Annotated`

/// tip | Consejo

Prefiere usar la versión `Annotated` si es posible.

///

```Python

And, for example, you will probably see that there are multiple processes running the same browser program (Firefox, Chrome, Edge, etc). They normally run one process per tab, plus some other extra processes.

<img class="shadow" src="/img/deployment/concepts/image01.png">

---

{!> ../../docs_src/python_types/tutorial008b_py310.py!}
```

これは `item` が `int` または `str` になり得ることを意味します。

#### `None` の可能性 { #possibly-none }

値が `str` のような型を持つ可能性がある一方で、`None` にもなり得ることを宣言できます。

//// tab | Python 3.10+

```Python hl_lines="1"
{!> ../../docs_src/python_types/tutorial009_py310.py!}
```

////

테스트:

## 코드 스니펫 { #code-snippets }

//// tab | 테스트

다음은 코드 스니펫입니다: `foo`. 그리고 이것은 또 다른 코드 스니펫입니다: `bar`. 그리고 또 하나: `baz quux`.

////

//// tab | 정보

코드 스니펫의 내용은 그대로 두어야 합니다.

`scripts/translate.py`의 일반 프롬프트에서 `### Content of code snippets` 섹션을 참고하세요.

////

## 따옴표 { #quotes }

//// tab | 테스트

//// tab | Linux, macOS, Windows Bash

<div class="termy">

```console
// Podrías crear una env var MY_NAME con
$ export MY_NAME="Wade Wilson"

// Luego podrías usarla con otros programas, como
$ echo "Hello $MY_NAME"

Hello Wade Wilson
```

</div>

////

//// tab | Windows PowerShell

<div class="termy">

```console