```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：

@app.get("/items/{item_id}")
async def read_item(item_id: str):
    if item_id not in items:
        raise HTTPException(
            status_code=404,
            detail="Item not found",
            headers={"X-Error": "Some custom header"},
        )
    return {"item": items[item_id]}


@app.get("/http-no-body-statuscode-exception")
async def no_body_status_code_exception():
    raise HTTPException(status_code=204)

import functools

import pytest
from fastapi import (
    APIRouter,
    Depends,
    FastAPI,
    Header,
    WebSocket,
    WebSocketDisconnect,
    status,
)
from fastapi.middleware import Middleware
from fastapi.testclient import TestClient

router = APIRouter()
prefix_router = APIRouter()
native_prefix_route = APIRouter(prefix="/native")
app = FastAPI()


@app.websocket_route("/")

## Использование `example` и `examples` в OpenAPI

При использовании любой из этих функций:

* `Path()`
* `Query()`
* `Header()`
* `Cookie()`
* `Body()`
* `Form()`
* `File()`

вы также можете добавить аргумент, содержащий `example` или группу `examples` с дополнительной информацией, которая будет добавлена в **OpenAPI**.

            200,
            {"strange_header": "FastAPI test"},
        ),
        (
            "/items",
            {"strange-header": "Not really underscore"},
            200,
            {"strange_header": None},
        ),
    ],
)
def test(path, headers, expected_status, expected_response, client: TestClient):
    response = client.get(path, headers=headers)

    response = client.get(
        "/users/", headers={"X-Token": "fake-super-secret-token", "X-Key": "invalid"}
    )
    assert response.status_code == 400, response.text
    assert response.json() == {"detail": "X-Key header invalid"}


@needs_py39
def test_get_valid_headers_items(client: TestClient):
    response = client.get(
        "/items/",
        headers={

@needs_py39
def test_get_invalid_second_header(client: TestClient):
    response = client.get(
        "/items/", headers={"X-Token": "fake-super-secret-token", "X-Key": "invalid"}
    )
    assert response.status_code == 400, response.text
    assert response.json() == {"detail": "X-Key header invalid"}


@needs_py39
def test_get_valid_headers(client: TestClient):

def test_items_with_missing_x_token_header(client: TestClient):
    response = client.get("/items?token=jessica")
    assert response.status_code == 422
    assert response.json() == IsDict(
        {
            "detail": [
                {
                    "type": "missing",
                    "loc": ["header", "x-token"],
                    "msg": "Field required",

from fastapi import Depends, FastAPI, Header, status
from fastapi.testclient import TestClient

app = FastAPI()


def get_header(*, someheader: str = Header()):
    return someheader


def get_something_else(*, someheader: str = Depends(get_header)):
    return f"{someheader}123"


@app.get("/")
def get_deps(dep1: str = Depends(get_header), dep2: str = Depends(get_something_else)):
    return {"dep1": dep1, "dep2": dep2}

from fastapi import FastAPI, Header

app = FastAPI()


@app.get("/items/")
async def read_items(
    strange_header: str | None = Header(default=None, convert_underscores=False),
):