from fastapi import APIRouter

router = APIRouter()


@router.post("/")
async def update_admin():

from fastapi import APIRouter

router = APIRouter()


@router.post("/")
async def update_admin():

from fastapi import APIRouter

router = APIRouter()


@router.post("/")
async def update_admin():

@needs_pydanticv2
def test_settings(monkeypatch: MonkeyPatch):
    monkeypatch.setenv("ADMIN_EMAIL", "admin@example.com")
    from docs_src.settings.tutorial001 import app

    client = TestClient(app)
    response = client.get("/info")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "app_name": "Awesome API",
        "admin_email": "admin@example.com",
        "items_per_user": 50,

class Settings(BaseSettings):
    app_name: str = "Awesome API"
    admin_email: str
    items_per_user: int = 50


settings = Settings()
app = FastAPI()


@app.get("/info")
async def info():
    return {
        "app_name": settings.app_name,
        "admin_email": settings.admin_email,
        "items_per_user": settings.items_per_user,

```

That way, the original `APIRouter` will keep unmodified, so we can still share that same `app/internal/admin.py` file with other projects in the organization.

The result is that in our app, each of the *path operations* from the `admin` module will have:

* The prefix `/admin`.
* The tag `admin`.
* The dependency `get_token_header`.
* The response `418`. 🍵

@lru_cache
def get_settings():
    return Settings()


@app.get("/info")
async def info(settings: Annotated[Settings, Depends(get_settings)]):
    return {
        "app_name": settings.app_name,
        "admin_email": settings.admin_email,
        "items_per_user": settings.items_per_user,

from pytest import MonkeyPatch

from ...utils import needs_pydanticv2


@needs_pydanticv2
def test_settings(monkeypatch: MonkeyPatch):
    from docs_src.settings.app02 import main

    monkeypatch.setenv("ADMIN_EMAIL", "admin@example.com")
    settings = main.get_settings()
    assert settings.app_name == "Awesome API"
    assert settings.items_per_user == 50


@needs_pydanticv2
def test_override_settings():

```Python hl_lines="14-17" title="app/main.py"
{!../../../docs_src/bigger_applications/app/main.py!}
```

这样，原始的 `APIRouter` 将保持不变，因此我们仍然可以与组织中的其他项目共享相同的 `app/internal/admin.py` 文件。

结果是在我们的应用程序中，来自 `admin` 模块的每个*路径操作*都将具有：

* `/admin` 前缀 。
* `admin` 标签。
* `get_token_header` 依赖项。
* `418` 响应。 🍵

但这只会影响我们应用中的 `APIRouter`，而不会影响使用它的任何其他代码。

因此，举例来说，其他项目能够以不同的身份认证方法使用相同的 `APIRouter`。

### 包含一个*路径操作*

@needs_pydanticv1
def test_settings(monkeypatch: MonkeyPatch):
    monkeypatch.setenv("ADMIN_EMAIL", "admin@example.com")
    from docs_src.settings.tutorial001_pv1 import app

    client = TestClient(app)
    response = client.get("/info")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "app_name": "Awesome API",
        "admin_email": "admin@example.com",
        "items_per_user": 50,