## Вызов `uvicorn` { #call-uvicorn }

В вашем FastAPI приложении, импортируйте и вызовите `uvicorn` напрямую:

{* ../../docs_src/debugging/tutorial001_py39.py hl[1,15] *}

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

Главная цель использования `__name__ == "__main__"` в том, чтобы код выполнялся при запуске файла с помощью:

<div class="termy">

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

</div>

from fastapi import FastAPI
from fastapi.responses import FileResponse

some_file_path = "large-video-file.mp4"
app = FastAPI()


@app.get("/")
async def main():

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

</div>

/// note | 참고

`uvicorn main:app` 명령은 다음을 의미합니다:

* `main`: 파일 `main.py` (파이썬 "모듈").
* `app`: `main.py` 내부의 `app = FastAPI()` 줄에서 생성한 오브젝트.
* `--reload`: 코드 변경 시 자동으로 서버 재시작. 개발 시에만 사용.

///

출력되는 줄들 중에는 아래와 같은 내용이 있습니다:

```hl_lines="4"

from fastapi.testclient import TestClient

from .main import app

client = TestClient(app)


def test_read_main():
    response = client.get("/")
    assert response.status_code == 200

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

maven-deploy-plugin 0.1 maven-plugin Maven Integration Test Plugin A test plugin to assist testing of Maven core. 2009 maven-core-it file:///${basedir}/repo true true org.apache.maven maven-plugin-api 2.0 . pom.xml src/** src/main/resources src/main/java/org/apache/maven/plugins/coreit/ItMojo.java src/main/java/org/apache/maven/plugins/coreit/ItMojo.java package org.apache.maven.plugin.coreit; /* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE...

   <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:

Para rodar qualquer um dos exemplos, copie o código para um arquivo `main.py`, e inicie o `fastapi dev` com:

<div class="termy">

```console
$ <font color="#4E9A06">fastapi</font> dev <u style="text-decoration-style:solid">main.py</u>

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

    </jsp:include>

    <main class="content-wrapper position-relative">
        <iframe class="w-100 h-100 position-absolute" style="border: 0;"
                src="<%=request.getContextPath()%>${serverPath}<%= response.encodeURL("/_plugin/kopf/") %>"
                title="<la:message key="labels.dashboard_plugin" />"></iframe>
    </main>

#                                                     ------
# Does it send mock mail? (true: no send actually, logging only)
mail.send.mock = false

# SMTP server settings for main: host:port
mail.smtp.server.main.host.and.port = localhost:25

# The prefix of subject to show test environment or not
mail.subject.test.prefix = 

# The common return path of all mail
mail.return.path = root@localhost