A single dot `.`, like in:

```Python
from .dependencies import get_token_header
```

would mean:

* Starting in the same package that this module (the file `app/routers/items.py`) lives in (the directory `app/routers/`)...
* find the module `dependencies` (an imaginary file at `app/routers/dependencies.py`)...
* and from it, import the function `get_token_header`.

from .dependencies import get_query_token, get_token_header
from .internal import admin
from .routers import items, users

app = FastAPI(dependencies=[Depends(get_query_token)])


app.include_router(users.router)
app.include_router(items.router)
app.include_router(
    admin.router,
    prefix="/admin",
    tags=["admin"],
    dependencies=[Depends(get_token_header)],
    responses={418: {"description": "I'm a teapot"}},

from fastapi import APIRouter, Depends, HTTPException

from ..dependencies import get_token_header

router = APIRouter(
    prefix="/items",
    tags=["items"],
    dependencies=[Depends(get_token_header)],
    responses={404: {"description": "Not found"}},
)


fake_items_db = {"plumbus": {"name": "Plumbus"}, "gun": {"name": "Portal Gun"}}


@router.get("/")
async def read_items():
    return fake_items_db

from fastapi import Header, HTTPException


async def get_token_header(x_token: str = Header()):
    if x_token != "fake-super-secret-token":
        raise HTTPException(status_code=400, detail="X-Token header invalid")


async def get_query_token(token: str):
    if token != "jessica":

```Python
from .dependencies import get_token_header
```

würde bedeuten:

* Beginnend im selben Package, in dem sich dieses Modul (die Datei `app/routers/items.py`) befindet (das Verzeichnis `app/routers/`) ...
* finde das Modul `dependencies` (eine imaginäre Datei unter `app/routers/dependencies.py`) ...
* und importiere daraus die Funktion `get_token_header`.

Одна точка `.`, как в данном примере:

```Python
from .dependencies import get_token_header
```
означает:

* Начните с пакета, в котором находится данный модуль (файл `app/routers/items.py` расположен в каталоге `app/routers/`)...
* ... найдите модуль `dependencies` (файл `app/routers/dependencies.py`)...
* ... и импортируйте из него функцию `get_token_header`.

```Python
from ..dependencies import get_token_header
```

表示：

* 从该模块（`app/routers/items.py` 文件）所在的同一个包（`app/routers/` 目录）开始...
* 跳转到其父包（`app/` 目录）...
* 在该父包中，找到 `dependencies` 模块（位于 `app/dependencies.py` 的文件）...
* 然后从中导入函数 `get_token_header`。

正常工作了！🎉

---

同样，如果我们使用了三个点 `...`，例如：

```Python
from ...dependencies import get_token_header
```

那将意味着：

Un solo punto `.`, como en:

```Python
from .dependencies import get_token_header
```

significaría:

* Partiendo en el mismo paquete en el que este módulo (el archivo `app/routers/items.py`) habita (el directorio `app/routers/`)...
* busca el módulo `dependencies` (un archivo imaginario en `app/routers/dependencies.py`)...
* y de él, importa la función `get_token_header`.

Um único ponto `.`, como em:

```Python
from .dependencies import get_token_header
```

significaria:

* Começando no mesmo pacote em que este módulo (o arquivo `app/routers/items.py`) vive (o diretório `app/routers/`)...
* encontre o módulo `dependencies` (um arquivo imaginário em `app/routers/dependencies.py`)...
* e dele, importe a função `get_token_header`.

                from fastapi import Depends, FastAPI

                from .dependencies import get_token_header
                from .internal import admin

                app = FastAPI()

                app.include_router(
                    admin.router,
                    dependencies=[Depends(get_token_header)],
                )
                ```
                """
            ),