Dans votre application FastAPI, importez et exécutez directement `uvicorn` :

```Python hl_lines="1  15"
{!../../../docs_src/debugging/tutorial001.py!}
```

### À propos de `__name__ == "__main__"`

Le but principal de `__name__ == "__main__"` est d'avoir du code qui est exécuté lorsque votre fichier est appelé avec :

<div class="termy">

```console
$ python myapp.py
```

</div>

## 🤙 `uvicorn`

👆 FastAPI 🈸, 🗄 & 🏃 `uvicorn` 🔗:

```Python hl_lines="1  15"
{!../../../docs_src/debugging/tutorial001.py!}
```

### 🔃 `__name__ == "__main__"`

👑 🎯 `__name__ == "__main__"` ✔️ 📟 👈 🛠️ 🕐❔ 👆 📁 🤙 ⏮️:

<div class="termy">

```console
$ python myapp.py
```

</div>

✋️ 🚫 🤙 🕐❔ ➕1️⃣ 📁 🗄 ⚫️, 💖:

```Python
from myapp import app
```

因此，为了能够在同一个文件中使用它们，我们直接导入子模块：

```Python hl_lines="5" title="app/main.py"
{!../../../docs_src/bigger_applications/app/main.py!}
```

### 包含 `users` 和 `items` 的 `APIRouter`

现在，让我们来包含来自 `users` 和 `items` 子模块的 `router`。

```Python hl_lines="10-11" title="app/main.py"
{!../../../docs_src/bigger_applications/app/main.py!}
```

!!! info

That way, you can edit the documentation/source files and see the changes live.

!!! tip
    Alternatively, you can perform the same steps that scripts does manually.

    Go into the language directory, for the main docs in English it's at `docs/en/`:

    ```console
    $ cd docs/en/
    ```

    Then run `mkdocs` in that directory:

    ```console
    $ mkdocs serve --dev-addr 8008
    ```

<span style="color: green;">INFO</span>:     Application startup complete.
```

</div>

!!! note
    `uvicorn main:app` 命令含义如下:

    * `main`：`main.py` 文件（一个 Python「模块」）。
    * `app`：在 `main.py` 文件中通过 `app = FastAPI()` 创建的对象。
    * `--reload`：让服务器在更新代码后重新启动。仅在开发时使用该选项。


在输出中，会有一行信息像下面这样：

```hl_lines="4"

It could look like this:

```JSON  hl_lines="7"
{
  "name": "frontend-app",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "generate-client": "openapi-ts --input http://localhost:8000/openapi.json --output ./src/client --client axios"
  },
  "author": "",
  "license": "",
  "devDependencies": {

<div class="termy">

```console
// Here we don't set the env var yet
$ python main.py

// As we didn't set the env var, we get the default value

Hello World from Python

// But if we create an environment variable first
$ export MY_NAME="Wade Wilson"

// And then call the program again
$ python main.py

// Now it can read the environment variable

Hello Wade Wilson from Python
```

# Advanced Middleware

In the main tutorial you read how to add [Custom Middleware](../tutorial/middleware.md){.internal-link target=_blank} to your application.

And then you also read how to handle [CORS with the `CORSMiddleware`](../tutorial/cors.md){.internal-link target=_blank}.

In this section we'll see how to use other middlewares.

## Adding ASGI middlewares

# (1)
COPY ./main.py /code/

# (2)
CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "80"]
```

1. `main.py` 파일을 `/code` 디렉터리로 곧바로 복사합니다(`./app` 디렉터리는 고려하지 않습니다).

2. Uvicorn을 실행해 `app` 객체를 (`app.main` 대신) `main`으로 부터 불러오도록 합니다.

그 다음 Uvicorn 커맨드를 조정해서 FastAPI 객체를 불러오는데 `app.main` 대신에 새로운 모듈 `main`을 사용하도록 합니다.

## 배포 개념

    🦁 & 🎯 🔛 🎯 🔬 📟, 👥 🖨 ⚫️.

## ✍ 💽

↩️ 🔜 👥 🔜 ⚙️ 🆕 💽 🆕 📁, 👥 💪 ⚒ 💭 👥 ✍ 💽 ⏮️:

```Python
Base.metadata.create_all(bind=engine)
```

👈 🛎 🤙 `main.py`, ✋️ ⏸ `main.py` ⚙️ 💽 📁 `sql_app.db`, & 👥 💪 ⚒ 💭 👥 ✍ `test.db` 💯.

👥 🚮 👈 ⏸ 📥, ⏮️ 🆕 📁.

```Python hl_lines="16"
{!../../../docs_src/sql_databases/sql_app/tests/test_sql_app.py!}
```

## 🔗 🔐