Weitere Informationen zu Starlettes `lifespan`-Handlern finden Sie in <a href="https://www.starlette.io/lifespan/" class="external-link" target="_blank">Starlettes Lifespan-Dokumentation</a>.

Einschließlich, wie man Lifespan-Zustand handhabt, der in anderen Bereichen Ihres Codes verwendet werden kann.

///

## Unteranwendungen

        yield {"sub_router": True}
        state.sub_router_shutdown = True

    sub_router = APIRouter(lifespan=subrouter_lifespan)

    router = APIRouter(lifespan=router_lifespan)
    router.include_router(sub_router)

    app = FastAPI(lifespan=lifespan)
    app.include_router(router)

    @app.get("/")
    def main(request: Request) -> Dict[str, str]:
        assert request.state.app

You can read more about the Starlette `lifespan` handlers in <a href="https://www.starlette.io/lifespan/" class="external-link" target="_blank">Starlette's  Lifespan' docs</a>.

Including how to handle lifespan state that can be used in other areas of your code.

///

## Sub Applications

Você pode ler mais sobre o manipulador `lifespan` do Starlette na <a href="https://www.starlette.io/lifespan/" class="external-link" target="_blank">Documentação do Lifespan Starlette</a>.

Incluindo como manipular estado do lifespan que pode ser usado em outras áreas do seu código.

///

## Sub Aplicações

    return x * 42


ml_models = {}


@asynccontextmanager
async def lifespan(app: FastAPI):
    # Load the ML model
    ml_models["answer_to_everything"] = fake_answer_to_everything_ml_model
    yield
    # Clean up the ML models and release the resources
    ml_models.clear()


app = FastAPI(lifespan=lifespan)


@app.get("/predict")
async def predict(x: float):

```Python
async with lifespan(app):
    await do_stuff()
```

🕐❔ 👆 ✍ 🔑 👨‍💼 ⚖️ 🔁 🔑 👨‍💼 💖 🔛, ⚫️❔ ⚫️ 🔨 👈, ⏭ 🛬 `with` 🍫, ⚫️ 🔜 🛠️ 📟 ⏭ `yield`, & ⏮️ ❎ `with` 🍫, ⚫️ 🔜 🛠️ 📟 ⏮️ `yield`.

👆 📟 🖼 🔛, 👥 🚫 ⚙️ ⚫️ 🔗, ✋️ 👥 🚶‍♀️ ⚫️ FastAPI ⚫️ ⚙️ ⚫️.

`lifespan` 🔢 `FastAPI` 📱 ✊ **🔁 🔑 👨‍💼**, 👥 💪 🚶‍♀️ 👆 🆕 `lifespan` 🔁 🔑 👨‍💼 ⚫️.

```Python hl_lines="22"

///

/// warning | "Aviso"

Se a sua aplicação depende dos eventos de vida útil (*lifespan*), o `AsyncClient` não acionará estes eventos. Para garantir que eles são acionados, utilize o `LifespanManager` do <a href="https://github.com/florimondmanca/asgi-lifespan#usage" class="external-link" target="_blank">florimondmanca/asgi-lifespan</a>.

///

## Outras Chamadas de Funções Assíncronas

///

/// warning | "Achtung"

Falls Ihre Anwendung auf Lifespan-Events angewiesen ist, der `AsyncClient` löst diese Events nicht aus. Um sicherzustellen, dass sie ausgelöst werden, verwenden Sie `LifespanManager` von <a href="https://github.com/florimondmanca/asgi-lifespan#usage" class="external-link" target="_blank">florimondmanca/asgi-lifespan</a>.

///

## Andere asynchrone Funktionsaufrufe

///

/// warning

If your application relies on lifespan events, the `AsyncClient` won't trigger these events. To ensure they are triggered, use `LifespanManager` from <a href="https://github.com/florimondmanca/asgi-lifespan#usage" class="external-link" target="_blank">florimondmanca/asgi-lifespan</a>.

///

## Other Asynchronous Function Calls

        lifespan: Annotated[
            Optional[Lifespan[Any]],
            Doc(
                """
                A `Lifespan` context manager handler. This replaces `startup` and
                `shutdown` functions with a single context manager.

                Read more in the
                [FastAPI docs for `lifespan`](https://fastapi.tiangolo.com/advanced/events/).
                """
            ),