{* ../../docs_src/dependencies/tutorial008e_an_py310.py hl[12,16] *}

`Depends()` reçoit un paramètre `scope` qui peut être :

    return user


async def get_current_active_user(
    current_user: Annotated[User, Depends(get_current_user)],
):
    if current_user.disabled:
        raise HTTPException(status_code=400, detail="Inactive user")
    return current_user


@app.post("/token")
async def login(form_data: Annotated[OAuth2PasswordRequestForm, Depends()]):
    user_dict = fake_users_db.get(form_data.username)
    if not user_dict:

commons: Annotated[CommonQueryParams, Depends()]
```

////

//// tab | Python 3.10+ 注釈なし

/// tip | 豆知識

可能であれば`Annotated`バージョンを使用することを推奨します。

///

```Python
commons: CommonQueryParams = Depends()
```

////

パラメータの型として依存関係を宣言し、`Depends()`の中でパラメータを指定せず、`Depends()`をその関数のパラメータの「デフォルト」値（`=`のあとの値）として使用することで、`Depends(CommonQueryParams)`の中でクラス全体を*もう一度*書かなくてもよくなります。

同じ例では以下のようになります:

):
    return await instance(value)


@app.get("/async-callable-gen-dependency-class")
async def get_async_callable_gen_dependency_class(
    value: str, instance: AsyncCallableGenDependency = Depends()
):
    return await instance(value).__anext__()


@app.get("/callable-dependency")
async def get_callable_dependency(value: str = Depends(callable_dependency)):
    return value

"""Test using special types (Response, Request, BackgroundTasks) as dependency annotations.

These tests verify that special FastAPI types can be used with Depends() annotations
and that the dependency injection system properly handles them.
"""

from typing import Annotated

from fastapi import BackgroundTasks, Depends, FastAPI, Request, Response
from fastapi.responses import JSONResponse
from fastapi.testclient import TestClient

## Type Annotation vs `Depends` { #type-annotation-vs-depends }

Yukarıdaki kodda `CommonQueryParams`'ı iki kez yazdığımıza dikkat edin:

//// tab | Python 3.10+

```Python
commons: Annotated[CommonQueryParams, Depends(CommonQueryParams)]
```

////

//// tab | Python 3.10+ Annotated Olmadan

/// tip | İpucu

# Dependencies - `Depends()` and `Security()`

## `Depends()`

Dependencies are handled mainly with the special function `Depends()` that takes a callable.

Here is the reference for it and its parameters.

You can import it directly from `fastapi`:

```python
from fastapi import Depends
```

::: fastapi.Depends

## `Security()`

async def get_current_active_user(
    current_user: Annotated[User, Depends(get_current_user)],
):
    if current_user.disabled:
        raise HTTPException(status_code=400, detail="Inactive user")
    return current_user


@app.post("/token")
async def login_for_access_token(
    form_data: Annotated[OAuth2PasswordRequestForm, Depends()],
) -> Token:

@app.get("/async")
async def get_async(state: str = Depends(asyncgen_state)):
    return state


@app.get("/sync")
async def get_sync(state: str = Depends(generator_state)):
    return state


@app.get("/async_raise")
async def get_async_raise(state: str = Depends(asyncgen_state_try)):
    assert state == "asyncgen raise started"
    raise AsyncDependencyError()

## Type annotation vs `Depends` { #type-annotation-vs-depends }

Notice how we write `CommonQueryParams` twice in the above code:

//// tab | Python 3.10+

```Python
commons: Annotated[CommonQueryParams, Depends(CommonQueryParams)]
```

////

//// tab | Python 3.10+ non-Annotated

/// tip