#  Elements of this map are as below:
    #   o url: (NotRequired - Default same as main schema)
    #   o schema: (Required: if empty schema means valid schema, not required)
    #   o user: (NotRequired - Default same as main schema)
    #   o password: (NotRequired - Default same as main schema)
    #   o propertiesMap: (NotRequired - Default map:{})

              case 1:
                return 1;
              case 2:
                return endOfData();
              default:
                throw new AssertionError("Should not have been invoked again");
            }
          }
        };

    assertTrue(iter.hasNext());
    assertEquals(0, (int) iter.next());

    // verify idempotence of hasNext()
    assertTrue(iter.hasNext());

<div class="termy">

```console
// Aquí todavía no configuramos la env var
$ python main.py

// Como no configuramos la env var, obtenemos el valor por defecto

Hello World from Python

// Pero si creamos una variable de entorno primero
$ export MY_NAME="Wade Wilson"

// Y luego llamamos al programa nuevamente
$ python main.py

// Ahora puede leer la variable de entorno

Hello Wade Wilson from Python
```

```
.
├── app
│   ├── __init__.py
│   ├── main.py
│   └── test_main.py
```

The file `main.py` would have:

{* ../../docs_src/async_tests/app_a_py39/main.py *}

The file `test_main.py` would have the tests for `main.py`, it could look like this now:

{* ../../docs_src/async_tests/app_a_py39/test_main.py *}

## Run it { #run-it }

///

## Модуль main в `FastAPI` { #the-main-fastapi }

Теперь давайте посмотрим на модуль `app/main.py`.

Именно сюда вы импортируете и именно здесь вы используете класс `FastAPI`.

Это основной файл вашего приложения, который объединяет всё в одно целое.

И теперь, когда большая часть логики приложения разделена на отдельные модули, основной файл `app/main.py` будет достаточно простым.

fun Project.applyOsgiMultiplatform(vararg bndProperties: String) {
  // BND is incompatible with Kotlin/Multiplatform because it assumes the JVM source set's name is
  // 'main'. Work around this by creating a 'main' source set that forwards to 'jvmMain'.
  //
  // The forwarding SourceSet also needs to fake out some task names to prevent them from being
  // registered twice.
  //
  // https://github.com/bndtools/bnd/issues/6590

            for (Artifact main : mains) {
                result.remove(main);
                if (deployBuildPom) {
                    // Add the main POM as a build POM with "build" classifier
                    result.add(new DefaultArtifact(
                            main.getGroupId(),
                            main.getArtifactId(),
                            BUILD_POM_CLASSIFIER,

from fastapi.cli import main

     * circumstances.
     */
    public static void main(String[] args) throws IOException {
        int exitCode = new MavenEncCling().run(args, null, null, null, false);
        System.exit(exitCode);
    }

    /**
     * ClassWorld Launcher "enhanced" entry point: returning exitCode and accepts Class World.
     */
    public static int main(String[] args, ClassWorld world) throws IOException {

     * circumstances.
     */
    public static void main(String[] args) throws IOException {
        int exitCode = new MavenShellCling().run(args, null, null, null, false);
        System.exit(exitCode);
    }

    /**
     * ClassWorld Launcher "enhanced" entry point: returning exitCode and accepts Class World.
     */
    public static int main(String[] args, ClassWorld world) throws IOException {