Давайте для начала сфокусируемся на зависимостях.

Это просто функция, которая может принимать все те же параметры, что и *функции обработки пути*:
//// tab | Python 3.10+

```Python hl_lines="8-9"
{!> ../../docs_src/dependencies/tutorial001_an_py310.py!}
```

////

//// tab | Python 3.9+

```Python hl_lines="8-11"
{!> ../../docs_src/dependencies/tutorial001_an_py39.py!}
```

////

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                </mxCell>
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非常にシンプルな例を見てみましょう。あまりにもシンプルなので、今のところはあまり参考にならないでしょう。

しかし、この方法では **依存性注入** システムがどのように機能するかに焦点を当てることができます。

### 依存関係の作成

まずは依存関係に注目してみましょう。

以下のように、*path operation関数*と同じパラメータを全て取ることができる関数にすぎません:

```Python hl_lines="8 9"
{!../../docs_src/dependencies/tutorial001.py!}
```

これだけです。

**２行**。

そして、それはすべての*path operation関数*が持っているのと同じ形と構造を持っています。

「デコレータ」を含まない（`@app.get("/some-path")`を含まない）*path operation関数*と考えることもできます。

                    <mxGeometry relative="1" as="geometry">
                        <mxPoint x="65.05882352941171" y="-220" as="sourcePoint"/>
                    </mxGeometry>
                </mxCell>
                <mxCell id="89" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;startArrow=none;startFill=0;endArrow=none;endFill=1;strokeWidth=3;dashed=1;" parent="1" source="32" target="100" edge="1">

Em seguida, usamos `hero_db.sqlmodel_update(hero_data)` para atualizar o `hero_db` com os dados de `hero_data`.

{* ../../docs_src/sql_databases/tutorial002_an_py310.py ln[83:93] hl[83:84,88:89] *}

### Deletar um Hero Novamente

**Deletar** um hero permanece praticamente o mesmo.

Não vamos satisfazer o desejo de refatorar tudo neste aqui. 😅

Primeiro vamos focar na dependência.

Ela é apenas uma função que pode receber os mesmos parâmetros de uma *função de operação de rota*:

//// tab | Python 3.10+

```Python hl_lines="8-9"
{!> ../../docs_src/dependencies/tutorial001_an_py310.py!}
```

////

//// tab | Python 3.9+

```Python hl_lines="8-11"
{!> ../../docs_src/dependencies/tutorial001_an_py39.py!}
```

////

### Annotate a Response Subclass

You can also use a subclass of `Response` in the type annotation:

```Python hl_lines="8-9"
{!> ../../docs_src/response_model/tutorial003_03.py!}
```

This will also work because `RedirectResponse` is a subclass of `Response`, and FastAPI will automatically handle this simple case.

Konzentrieren wir uns zunächst auf die Abhängigkeit - die Dependency.

Es handelt sich einfach um eine Funktion, die die gleichen Parameter entgegennimmt wie eine *Pfadoperation-Funktion*:
//// tab | Python 3.10+

```Python hl_lines="8-9"
{!> ../../docs_src/dependencies/tutorial001_an_py310.py!}
```

////

//// tab | Python 3.9+

```Python hl_lines="8-11"
{!> ../../docs_src/dependencies/tutorial001_an_py39.py!}
```

////

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                    <mxGeometry relative="1" as="geometry">
                        <mxPoint x="65.05882352941171" y="-220" as="sourcePoint"/>
                    </mxGeometry>
                </mxCell>
                <mxCell id="89" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;startArrow=none;startFill=0;endArrow=none;endFill=1;strokeWidth=3;dashed=1;" parent="1" source="32" target="100" edge="1">