# Klassen als Abhängigkeiten

Bevor wir tiefer in das **Dependency Injection** System eintauchen, lassen Sie uns das vorherige Beispiel verbessern.

## Ein `dict` aus dem vorherigen Beispiel

Im vorherigen Beispiel haben wir ein `dict` von unserer Abhängigkeit („Dependable“) zurückgegeben:

//// tab | Python 3.10+

```Python hl_lines="9"
{!> ../../docs_src/dependencies/tutorial001_an_py310.py!}
```

////

//// tab | Python 3.9+

    price: float
    tax: Union[float, None] = None


app = FastAPI()


@app.put("/items/{item_id}")
async def update_item(item_id: int, item: Item):

import org.apache.lucene.analysis.ja.JapaneseTokenizer.Mode;
import org.apache.lucene.analysis.ja.JapaneseTokenizer.Type;
import org.apache.lucene.analysis.ja.dict.Dictionary;
import org.apache.lucene.analysis.ja.dict.TokenInfoFST;
import org.apache.lucene.analysis.ja.dict.UserDictionary;
import org.apache.lucene.util.AttributeSource;
import org.codelibs.opensearch.extension.kuromoji.index.analysis.KuromojiTokenizerFactory;

}
```

/// info

In Pydantic v1 the method was called `.dict()`, it was deprecated (but still supported) in Pydantic v2, and renamed to `.model_dump()`.

The examples here use `.dict()` for compatibility with Pydantic v1, but you should use `.model_dump()` instead if you can use Pydantic v2.

///

/// info

    tax: Union[float, None] = None


app = FastAPI()


@app.put("/items/{item_id}")
async def update_item(item_id: int, item: Item, q: Union[str, None] = None):
    result = {"item_id": item_id, **item.dict()}
    if q:
        result.update({"q": q})

app = FastAPI()


async def common_parameters(
    q: Union[str, None] = None, skip: int = 0, limit: int = 100
):
    return {"q": q, "skip": skip, "limit": limit}


CommonsDep = Annotated[dict, Depends(common_parameters)]


@app.get("/items/")
async def read_items(commons: CommonsDep):
    return commons


@app.get("/users/")
async def read_users(commons: CommonsDep):

def fake_password_hasher(raw_password: str):
    return "supersecret" + raw_password


def fake_save_user(user_in: UserIn):
    hashed_password = fake_password_hasher(user_in.password)
    user_in_db = UserInDB(**user_in.dict(), hashed_password=hashed_password)
    print("User saved! ..not really")
    return user_in_db


@app.post("/user/", response_model=UserOut)
async def create_user(user_in: UserIn):

							<p><la:message key="labels.menu_design" /></p>
						</a></li></c:if>
						
					<c:if test="${fe:permission('admin-dict-view') and fesenType!='cloud' and fesenType!='aws'}">
					<li class="nav-item">
						<a href="${fe:url('/admin/dict/')}" class="nav-link <c:if test="${param.menuType=='dict'}">active</c:if>">
							<em class='fa fa-genderless nav-icon'>
							<p><la:message key="labels.menu_dict" /></p>
						</a>

⤴️ 👆 🎏 👆 💯.

🤶 Ⓜ.:

* 🚶‍♀️ *➡* ⚖️ *🔢* 🔢, 🚮 ⚫️ 📛 ⚫️.
* 🚶‍♀️ 🎻 💪, 🚶‍♀️ 🐍 🎚 (✅ `dict`) 🔢 `json`.
* 🚥 👆 💪 📨 *📨 💽* ↩️ 🎻, ⚙️ `data` 🔢 ↩️.
* 🚶‍♀️ *🎚*, ⚙️ `dict` `headers` 🔢.
*  *🍪*, `dict` `cookies` 🔢.

🌖 ℹ 🔃 ❔ 🚶‍♀️ 💽 👩‍💻 (⚙️ `httpx` ⚖️ `TestClient`) ✅ <a href="https://www.python-httpx.org" class="external-link" target="_blank">🇸🇲 🧾</a>.

# Classes as Dependencies

Before diving deeper into the **Dependency Injection** system, let's upgrade the previous example.

## A `dict` from the previous example

In the previous example, we were returning a `dict` from our dependency ("dependable"):

//// tab | Python 3.10+

```Python hl_lines="9"
{!> ../../docs_src/dependencies/tutorial001_an_py310.py!}
```

////

//// tab | Python 3.9+

```Python hl_lines="11"