<span style="background-color:#007166"><font color="#D3D7CF"> module </font></span>  🐍 main.py

     <span style="background-color:#007166"><font color="#D3D7CF"> code </font></span>  Importing the FastAPI app object from the module with
             the following code:

//// tab | Linux, macOS, Windows Bash

<div class="termy">

```console
// 여기서는 아직 환경 변수를 설정하지 않습니다
$ python main.py

// 환경 변수를 설정하지 않았으므로 기본값이 사용됩니다

Hello World from Python

// 하지만 먼저 환경 변수를 생성하면
$ export MY_NAME="Wade Wilson"

// 그리고 프로그램을 다시 실행하면
$ python main.py

// 이제 환경 변수를 읽을 수 있습니다

Hello Wade Wilson from Python
```

</div>

////

然后你可以调用这个 Python 程序：

//// tab | Linux, macOS, Windows Bash

<div class="termy">

```console
// 这里我们还没有设置环境变量
$ python main.py

// 因为我们没有设置环境变量，所以我们得到的是默认值

Hello World from Python

// 但是如果我们事先创建过一个环境变量
$ export MY_NAME="Wade Wilson"

// 然后再次调用程序
$ python main.py

// 现在就可以读取到环境变量了

Hello Wade Wilson from Python
```

</div>

////

//// tab | Windows PowerShell

 [CVE-2022-24329]: https://nvd.nist.gov/vuln/detail/CVE-2022-24329
 [dev_server]: https://github.com/square/okhttp/blob/482f88300f78c3419b04379fc26c3683c10d6a9d/samples/guide/src/main/java/okhttp3/recipes/kt/DevServer.kt
 [fun_interface]: https://kotlinlang.org/docs/reference/fun-interfaces.html
 [iana_websocket]: https://www.iana.org/assignments/websocket/websocket.txt

import okhttp3.MediaType
import okhttp3.MediaType.Companion.toMediaTypeOrNull
import okhttp3.Request
import okhttp3.RequestBody.Companion.toRequestBody
import okhttp3.curl.Main
import okhttp3.internal.http.StatusLine
import okio.sink

internal fun Main.commonCreateRequest(): Request {
  val request = Request.Builder()

  val requestMethod = method ?: if (data != null) "POST" else "GET"

  /**
   * Transmission On: Although originally defined as DC1, this ASCII control character is now better
   * known as the XON code used for software flow control in serial communications. The main use is
   * restarting the transmission after the communication has been stopped by the XOFF control code.
   *
   * @since 8.0
   */
  public static final byte XON = 17; // aka DC1

  /**

RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt

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

# (2)!
CMD ["fastapi", "run", "main.py", "--port", "80"]
```

1. 直接将 `main.py` 复制到 `/code`（没有 `./app` 目录）。

2. 使用 `fastapi run` 来运行单文件 `main.py` 中的应用。

当你把文件传给 `fastapi run` 时，它会自动检测这是一个单文件而不是包，并知道如何导入并服务你的 FastAPI 应用。😎

## 部署概念 { #deployment-concepts }

<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
```

## `uvicorn`'ı Çağırma { #call-uvicorn }

FastAPI uygulamanızda `uvicorn`'ı import edip doğrudan çalıştırın:

{* ../../docs_src/debugging/tutorial001_py310.py hl[1,15] *}

### `__name__ == "__main__"` Hakkında { #about-name-main }

`__name__ == "__main__"` ifadesinin temel amacı, dosyanız şu şekilde çağrıldığında çalışacak:

<div class="termy">

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

</div>

```console
// Здесь мы еще не устанавливаем переменную окружения
$ python main.py

// Поскольку мы не задали переменную окружения, мы получим значение по умолчанию

Hello World from Python

// Но если мы сначала создадим переменную окружения
$ export MY_NAME="Wade Wilson"

// А затем снова запустим программу
$ python main.py

// Теперь она прочитает переменную окружения

Hello Wade Wilson from Python
```