<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>

////

//// tab | Windows PowerShell

<div class="termy">

```console

<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

<div class="termy">

```console

from fastapi import FastAPI
from fastapi.testclient import TestClient
from fastapi.websockets import WebSocket

app = FastAPI()


@app.get("/")
async def read_main():
    return {"msg": "Hello World"}


@app.websocket("/ws")
async def websocket(websocket: WebSocket):
    await websocket.accept()
    await websocket.send_json({"msg": "Hello WebSocket"})
    await websocket.close()


def test_read_main():

```Python
from unicorn import UnicornMiddleware

app = SomeASGIApp()

new_app = UnicornMiddleware(app, some_config="rainbow")
```

하지만 FastAPI(정확히는 Starlette)는 더 간단한 방법을 제공하며, 이를 통해 내부 middleware가 서버 오류를 처리하고 커스텀 예외 핸들러가 올바르게 동작하도록 보장합니다.

이를 위해(그리고 CORS 예제에서처럼) `app.add_middleware()`를 사용합니다.

```Python
from fastapi import FastAPI
from unicorn import UnicornMiddleware

app = FastAPI()

  <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting development server 🚀

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

    #   o key of map: a relative path to the application project from DBFlute client
    #   o sqlDirectory: SQL directory as a relative path from the application directory 
    #     (NotRequired - Default Java:'src/main/java' & 'src/main/resources' CSharp:'source')
    #   o sql2EntityOutputDirectory: source output directory from as a relative path from the application directory

<configuration/> element and <parameters/> element. From these elements we need to make a component configuration for the MojoExecution. The actual DOM like structure we create is of type PlexusConfiguration and is the type we use with the ComponentConfigurator to initialize fields in a Plexus component. Typically this is done within Plexus with the configuration supplied with component configuration, but in Maven we take configuration values from the POM. So we have to use the ComponentConfigurator...

  <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting production server 🚀

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

  <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting production server 🚀

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

    password = user_dict["password"],
    email = user_dict["email"],
    full_name = user_dict["full_name"],
)
```

#### A Pydantic model from the contents of another { #a-pydantic-model-from-the-contents-of-another }

As in the example above we got `user_dict` from `user_in.model_dump()`, this code:

```Python
user_dict = user_in.model_dump()
UserInDB(**user_dict)
```

would be equivalent to: