{* ../../docs_src/body_nested_models/tutorial002_py310.py hl[12] *}

## Типы множеств { #set-types }

Но затем мы подумали и поняли, что теги не должны повторяться, вероятно, это должны быть уникальные строки.

И в Python есть специальный тип данных для множеств уникальных элементов — `set`.

Тогда мы можем объявить поле `tags` как множество строк:

        500: {"description": "Server error level 0"},
    },
    default_response_class=ResponseLevel0,
    callbacks=callback_router0.routes,
)

router2_override = APIRouter(
    prefix="/level2",
    tags=["level2a", "level2b"],
    dependencies=[Depends(dep2)],
    responses={
        402: {"description": "Client error level 2"},
        502: {"description": "Server error level 2"},
    },

    /**
     * Creates a new PrunedTag instance with the specified tag name.
     *
     * @param tag the HTML tag name to match (e.g., "div", "span", "p")
     */
    public PrunedTag(final String tag) {
        this.tag = tag;
    }

    /**
     * Checks if this pruned tag configuration matches the given DOM node.
     * The matching is based on tag name, and optionally ID, CSS class, or custom attributes.
     *

                                "title": "Tax",
                                "anyOf": [{"type": "number"}, {"type": "null"}],
                            },
                            "tags": {
                                "title": "Tags",
                                "default": [],
                                "type": "array",
                                "items": {"type": "string"},

### 创建标签元数据 { #create-metadata-for-tags }

让我们在带有标签的示例中为 `users` 和 `items` 试一下。

创建标签元数据并把它传递给 `openapi_tags` 参数：

{* ../../docs_src/metadata/tutorial004_py310.py hl[3:16,18] *}

注意你可以在描述内使用 Markdown，例如「login」会显示为粗体（**login**）以及「fancy」会显示为斜体（_fancy_）。

/// tip | 提示

不必为你使用的所有标签都添加元数据。

///

### 使用你的标签 { #use-your-tags }

将 `tags` 参数和*路径操作*（以及 `APIRouter`）一起使用，将其分配给不同的标签：

///

## 태그 { #tags }

(보통 단일 `str`인) `str`로 구성된 `list`와 함께 매개변수 `tags`를 전달하여, *경로 처리*에 태그를 추가할 수 있습니다:

{* ../../docs_src/path_operation_configuration/tutorial002_py310.py hl[15,20,25] *}

전달된 태그들은 OpenAPI의 스키마에 추가되며, 자동 문서 인터페이스에서 사용됩니다:

<img src="/img/tutorial/path-operation-configuration/image01.png">

### Enum을 사용한 태그 { #tags-with-enums }

def get_openapi_operation_metadata(
    *, route: routing.APIRoute, method: str, operation_ids: set[str]
) -> dict[str, Any]:
    operation: dict[str, Any] = {}
    if route.tags:
        operation["tags"] = route.tags
    operation["summary"] = generate_operation_summary(route=route, method=method)
    if route.description:
        operation["description"] = route.description

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    description: str | None = None
    price: float
    tax: float | None = None
    tags: list = []


@app.put("/items/{item_id}")
async def update_item(item_id: int, item: Item):
    results = {"item_id": item_id, "item": item}

<?xml version="1.0" encoding="UTF-8"?>
<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/">
  <ShortName>Fess</ShortName>
  <Description>Full Text Search for Your Documents.</Description>
  <Tags>Full Text Search</Tags>
  <Contact>******@****.***</Contact>
  <SearchForm>http://localhost:8080/fess/</SearchForm>
  <Url type="text/html" template="http://localhost:8080/fess/search?q={searchTerms}"/>
  <InputEncoding>UTF-8</InputEncoding>

    name: str
    description: str | None = None
    price: float
    tax: float = 10.5
    tags: list[str] = []


items = {
    "foo": {"name": "Foo", "price": 50.2},
    "bar": {"name": "Bar", "description": "The bartenders", "price": 62, "tax": 20.2},
    "baz": {"name": "Baz", "description": None, "price": 50.2, "tax": 10.5, "tags": []},
}


@app.get("/items/{item_id}", response_model=Item, response_model_exclude_unset=True)