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

{* ../../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:

      .url(HttpUrl.get("https://square.com/"))
      .tag(Integer.class, 5)
      .tag(String.class, "hello")
      .build();
    Call call = client.newCall(request);

    assertEquals(5, call.tag(Integer.class));
    assertEquals("hello", call.tag(String.class));
    assertEquals(null, call.tag(Boolean.class));
    assertEquals(null, call.tag(Object.class));
  }

  @Test
  public void tagsCanBeComputed() {

    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/users/": {
                "get": {
                    "tags": ["users"],
                    "summary": "Get Users",
                    "operationId": "get_users_users__get",
                    "responses": {
                        "200": {

from fastapi import FastAPI, status
from pydantic import BaseModel

app = FastAPI()


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


@app.post("/items/", response_model=Item, status_code=status.HTTP_201_CREATED)
async def create_item(item: Item):

///

### Usar tus etiquetas { #use-your-tags }

Usa el parámetro `tags` con tus *path operations* (y `APIRouter`s) para asignarlas a diferentes etiquetas:

{* ../../docs_src/metadata/tutorial004_py39.py hl[21,26] *}

/// info | Información

Lee más sobre etiquetas en [Configuración de Path Operation](path-operation-configuration.md#tags){.internal-link target=_blank}.

///

            tagClass = header.tagClass,
            tag = header.tag,
            constructed = header.constructed,
            length = header.length,
            bytes = bytes,
          )
        }
      }

      override fun toDer(
        writer: DerWriter,
        value: AnyValue,
      ) {
        writer.write("ANY", value.tagClass, value.tag) {
          writer.writeOctetString(value.bytes)

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

  private fun enableLogging(
    logger: String,
    tag: String,
  ) {
    val logger = Logger.getLogger(logger)
    if (configuredLoggers.add(logger)) {
      logger.useParentHandlers = false
      // log based on levels at startup to avoid logging each frame
      logger.level =
        when {
          Log.isLoggable(tag, Log.DEBUG) -> Level.FINE
          Log.isLoggable(tag, Log.INFO) -> Level.INFO
          else -> Level.WARNING

from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    description: Union[str, None] = None
    price: float
    tax: Union[float, None] = None
    tags: set[str] = set()


@app.post("/items/", response_model=Item, status_code=status.HTTP_201_CREATED)
async def create_item(item: Item):