# TODO: probably make status_code a default class attribute for all
                # responses in Starlette
                response_signature = inspect.signature(current_response_class.__init__)
                status_code_param = response_signature.parameters.get("status_code")
                if status_code_param is not None:
                    if isinstance(status_code_param.default, int):

```Python
{!../../docs_src/settings/app01/config.py!}
```

& ⤴️ ⚙️ ⚫️ 📁 `main.py`:

```Python hl_lines="3  11-13"
{!../../docs_src/settings/app01/main.py!}
```

/// tip

👆 🔜 💪 📁 `__init__.py` 👆 👀 🔛 [🦏 🈸 - 💗 📁](../tutorial/bigger-applications.md){.internal-link target=_blank}.

///

## ⚒ 🔗

🍾 ⚫️ 5️⃣📆 ⚠ 🚚 ⚒ ⚪️➡️ 🔗, ↩️ ✔️ 🌐 🎚 ⏮️ `settings` 👈 ⚙️ 🌐.

在文档中也有一篇使用 Peewee 的等效的文章。

///

## 文件结构

对于这些示例，假设您有一个名为的目录`my_super_project`，其中包含一个名为的子目录`sql_app`，其结构如下：

```
.
└── sql_app
    ├── __init__.py
    ├── crud.py
    ├── database.py
    ├── main.py
    ├── models.py
    └── schemas.py
```

该文件`__init__.py`只是一个空文件，但它告诉 Python `sql_app` 是一个包。

现在让我们看看每个文件/模块的作用。

## 安装 SQLAlchemy

首先你需要安装`SQLAlchemy`:

<div class="termy">

/// info

There are other formats and tools to define and install package dependencies.

///

### Create the **FastAPI** Code

* Create an `app` directory and enter it.
* Create an empty file `__init__.py`.
* Create a `main.py` file with:

```Python
from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():

Eu vou mostrar um exemplo depois usando Poetry em uma seção abaixo. 👇

///

### Criando o Código do **FastAPI**

* Crie um diretório `app` e entre nele.
* Crie um arquivo vazio `__init__.py`.
* Crie um arquivo `main.py` com:

```Python
from typing import Optional

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():

В этом же разделе, но позже, я покажу вам пример использования Poetry. 👇

///

### Создать приложение **FastAPI**

* Создайте директорию `app` и перейдите в неё.
* Создайте пустой файл `__init__.py`.
* Создайте файл `main.py` и заполните его:

```Python
from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():

```Python
{!../../docs_src/settings/app01/config.py!}
```

然后在一个名为 `main.py` 的文件中使用它：

```Python hl_lines="3  11-13"
{!../../docs_src/settings/app01/main.py!}
```

/// tip

您还需要一个名为 `__init__.py` 的文件，就像您在[Bigger Applications - Multiple Files](../tutorial/bigger-applications.md){.internal-link target=_blank}中看到的那样。

///

## 在依赖项中使用设置

在某些情况下，从依赖项中提供设置可能比在所有地方都使用全局对象 `settings` 更有用。

            await dependant.call(**solved_result.values)

    return app


class APIWebSocketRoute(routing.WebSocketRoute):
    def __init__(
        self,
        path: str,
        endpoint: Callable[..., Any],
        *,
        name: Optional[str] = None,
        dependencies: Optional[Sequence[params.Depends]] = None,

///

### Den **FastAPI**-Code erstellen

* Erstellen Sie ein `app`-Verzeichnis und betreten Sie es.
* Erstellen Sie eine leere Datei `__init__.py`.
* Erstellen Sie eine `main.py`-Datei mit:

```Python
from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():

```

E utilizar essa configuração em `main.py`:

```Python hl_lines="3  11-13"
{!../../docs_src/settings/app01/main.py!}
```

/// dica

Você também precisa incluir um arquivo `__init__.py` como visto em [Bigger Applications - Multiple Files](../tutorial/bigger-applications.md){.internal-link target=\_blank}.

///

## Configurações em uma dependência