# 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):

<font color="#3465A4">INFO    </font> Searching for package file structure from directories with <font color="#3465A4">__init__.py</font> files
<font color="#3465A4">INFO    </font> Importing from <font color="#75507B">/home/user/code/</font><font color="#AD7FA8">awesomeapp</font>

 ╭─ <font color="#8AE234"><b>Python module file</b></font> ─╮

    # We intentionally do not pool so that we can easily test load distribution across many versions of our backends
    return requests.get(url, **kwargs)


class Writer(object):
    def __init__(self, filename):
        self.file = open(filename, 'w')

    def write(self, data):
        self.file.write(data)

    def flush(self):
        self.file.flush()


if __name__ == '__main__':

    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">

```console

```

</div>

!!! info
    📤 🎏 📁 &amp; 🧰 🔬 &amp; ❎ 📦 🔗.

    👤 🔜 🎦 👆 🖼 ⚙️ 🎶 ⏪ 📄 🔛. 👶

### ✍ **FastAPI** 📟

* ✍ `app` 📁 &amp; ⛔ ⚫️.
* ✍ 🛁 📁 `__init__.py`.
* ✍ `main.py` 📁 ⏮️:

```Python
from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}

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

And then use it in a file `main.py`:

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

!!! tip
    You would also need a file `__init__.py` as you saw in [Bigger Applications - Multiple Files](../tutorial/bigger-applications.md){.internal-link target=_blank}.

## Settings in a dependency

    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():

    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():

  return variable_nodes


class MultipleSignatureModel(module.Module):
  """A model with 2 signatures.

  Used to test where the quantizer has to handle multiple signatures.
  """

  def __init__(self):
    self.matmul_filters = random_ops.random_uniform(
        shape=(4, 3), minval=-1.0, maxval=1.0
    )
    self.conv_filters = np.random.uniform(
        low=-10, high=10, size=(2, 3, 3, 2)

</div>

!!! 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():