sample_file = static_dir / "sample.txt"
    sample_file.write_text("This is a sample static file.")
    from docs_src.static_files.tutorial001_py39 import app

    with TestClient(app) as client:
        yield client
    sample_file.unlink()
    static_dir.rmdir()


def test_static_files(client: TestClient):
    response = client.get("/static/sample.txt")
    assert response.status_code == 200, response.text

可能你需要启动一个新版本，或者你只是你厌倦了运行它。 🤷

///

## 生命周期函数

首先要注意的是，我们定义了一个带有 `yield` 的异步函数。这与带有 `yield` 的依赖项非常相似。

```Python hl_lines="14-19"
{!../../docs_src/events/tutorial003.py!}
```

这个函数在 `yield`之前的部分，会在应用启动前执行。

剩下的部分在 `yield` 之后，会在应用完成后执行。

## 异步上下文管理器

如你所见，这个函数有一个装饰器 `@asynccontextmanager` 。

它将函数转化为所谓的“**异步上下文管理器**”。

```Python hl_lines="1  13"
{!../../docs_src/events/tutorial003.py!}
```

= X/Z, y = Y/Z, and xy = T/Z per https://eprint.iacr.org/2008/522. x, y, z, t field.Element } type incomparable [0]func() func checkInitialized(points ...*Point) { for _, p := range points { if p.x == (field.Element{}) && p.y == (field.Element{}) { panic("edwards25519: use of uninitialized Point") } } } type projCached struct { YplusX, YminusX, Z, T2d field.Element } type affineCached struct { YplusX, YminusX, T2d field.Element } // Constructors. func (v *projP2) Zero() *projP2 { v.X.Zero() v.Y.One()...

class CallableGenDependency:
    def __call__(self, value: str) -> Generator[str, None, None]:
        yield value


class AsyncCallableDependency:
    async def __call__(self, value: str) -> str:
        return value


class AsyncCallableGenDependency:
    async def __call__(self, value: str) -> AsyncGenerator[str, None]:
        yield value


class MethodsDependency:
    def synchronous(self, value: str) -> str:

from fastapi.testclient import TestClient

items = {}


@asynccontextmanager
async def lifespan(app: FastAPI):
    items["foo"] = {"name": "Fighters"}
    items["bar"] = {"name": "Tenders"}
    yield
    # clean up items
    items.clear()


app = FastAPI(lifespan=lifespan)


@app.get("/items/{item_id}")
async def read_items(item_id: str):
    return items[item_id]


def test_read_items():

 *   <li>Methods</li>
 *   <li>Fields</li>
 * </ul>
 * <p>
 * Example usage:
 * <pre>
 * public class MyService {
 *     private final Repository repository;
 *
 *     {@literal @}Inject
 *     public MyService(Repository repository) {
 *         this.repository = repository;
 *     }
 * }
 * </pre>
 *
 * @see Named
 * @since 4.0.0
 */
@Target({FIELD, CONSTRUCTOR, METHOD})
@Retention(RUNTIME)

}

// ParseUniqueConstraints parse schema unique constraints
func (schema *Schema) ParseUniqueConstraints() map[string]UniqueConstraint {
	uniques := make(map[string]UniqueConstraint)
	for _, field := range schema.Fields {
		if field.Unique {
			name := schema.namer.UniqueName(schema.Table, field.DBName)
			uniques[name] = UniqueConstraint{Name: name, Field: field}
		}
	}
	return uniques

## Поля-списки { #list-fields }

Вы можете определить атрибут как подтип. Например, Python-тип `list`:

{* ../../docs_src/body_nested_models/tutorial001_py310.py hl[12] *}

Это приведёт к тому, что `tags` будет списком, несмотря на то, что тип его элементов не объявлен.

## Поля-списки с параметром типа { #list-fields-with-type-parameter }

    fields `username` and `password`.

    All the initialization parameters are extracted from the request.

    The only difference between `OAuth2PasswordRequestFormStrict` and
    `OAuth2PasswordRequestForm` is that `OAuth2PasswordRequestFormStrict` requires the
    client to send the form field `grant_type` with the value `"password"`, which

from fastapi.testclient import TestClient


@pytest.fixture(name="app", scope="module")
def get_app():
    with pytest.warns(DeprecationWarning):
        from docs_src.events.tutorial001_py39 import app
    yield app


def test_events(app: FastAPI):
    with TestClient(app) as client:
        response = client.get("/items/foo")
        assert response.status_code == 200, response.text