TFE_Context* ctx, int keep_alive_secs, const void* proto, size_t proto_len,
    int64_t init_timeout_in_ms, TF_Status* status,
    bool clear_existing_contexts);

// Set server def with retries and timeout. This is helpful for fault-tolerant
// initial connection in high-preemption environments, such as
// ParameterServerStrategy training.
// This API is for experimental usage and may be subject to change.

   FastAPI 仍然能够将数据<dfn title="把数据转换为可以传输的格式">序列化</dfn>为 JSON。
7. 这里的 `response_model` 使用了 “`Author` 数据类列表” 的类型注解。

   同样，你可以将 `dataclasses` 与标准类型注解组合使用。
8. 注意，这个 *路径操作函数* 使用的是常规的 `def` 而不是 `async def`。

   一如既往，在 FastAPI 中你可以按需组合 `def` 和 `async def`。

   如果需要回顾何时用哪一个，请查看关于 [`async` 和 `await`](../async.md#in-a-hurry) 的文档中的 _“急不可待？”_ 一节。
9. 这个 *路径操作函数* 返回的不是数据类（当然也可以返回数据类），而是包含内部数据的字典列表。

   FastAPI 会使用（包含数据类的）`response_model` 参数来转换响应。

        }
    }
)


@app.get("/route1")
async def route1():
    pass  # pragma: no cover


@app.get("/route2")
async def route2():
    pass  # pragma: no cover


client = TestClient(app)


def test_openapi_schema():
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text

from docs_src.additional_responses.tutorial001_py310 import app

client = TestClient(app)


def test_path_operation():
    response = client.get("/items/foo")
    assert response.status_code == 200, response.text
    assert response.json() == {"id": "foo", "value": "there goes my hero"}


def test_path_operation_not_found():
    response = client.get("/items/bar")
    assert response.status_code == 404, response.text

from fastapi import FastAPI
from fastapi.testclient import TestClient
from inline_snapshot import snapshot

app = FastAPI()


@app.get("/a/{id}")
async def a(id):
    pass  # pragma: no cover


client = TestClient(app)


def test_openapi_schema():
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == snapshot(
        {

import http

from fastapi import FastAPI
from fastapi.testclient import TestClient


def test_no_content():
    app = FastAPI()

    @app.get("/no-content", status_code=http.HTTPStatus.NO_CONTENT)
    def return_no_content() -> "None":
        return

    client = TestClient(app)
    response = client.get("/no-content")
    assert response.status_code == http.HTTPStatus.NO_CONTENT, response.text

from fastapi.testclient import TestClient

from .config import Settings
from .main import app, get_settings

client = TestClient(app)


def get_settings_override():
    return Settings(admin_email="******@****.***")


app.dependency_overrides[get_settings] = get_settings_override


def test_app():
    response = client.get("/info")
    data = response.json()
    assert data == {
        "app_name": "Awesome API",

@pytest.fixture(
    name="client",
    params=[
        pytest.param("tutorial001_py310", marks=needs_py310),
    ],
)
def get_client(request: pytest.FixtureRequest):
    mod = importlib.import_module(f"docs_src.body_updates.{request.param}")

    client = TestClient(mod.app)
    return client


def test_get(client: TestClient):
    response = client.get("/items/baz")
    assert response.status_code == 200, response.text

from fastapi.testclient import TestClient

app = FastAPI()

router = APIRouter()


@router.get("/users/{id}")
def read_user(segment: str, id: str):
    return {"segment": segment, "id": id}


app.include_router(router, prefix="/{segment}")


client = TestClient(app)


def test_get():
    response = client.get("/seg/users/foo")
    assert response.status_code == 200, response.text

Это обычная функция, которая может принимать параметры.

Это может быть как `async def`, так и обычная функция `def`, **FastAPI** знает, как корректно её выполнить.

В этом случае функция задачи будет записывать данные в файл (имитируя отправку письма).

Так как операция записи не использует `async` и `await`, мы определим функцию как обычную `def`:

{* ../../docs_src/background_tasks/tutorial001_py310.py hl[6:9] *}