{* ../../docs_src/bigger_applications/app_an_py39/main.py hl[1,3,7] title["app/main.py"] *}

### Den `APIRouter` importieren { #import-the-apirouter }

Jetzt importieren wir die anderen Submodule, die `APIRouter` haben:

{* ../../docs_src/bigger_applications/app_an_py39/main.py hl[4:5] title["app/main.py"] *}

        project.addSourceRoot(new DefaultSourceRoot(
                ProjectScope.MAIN, Language.JAVA_FAMILY, Path.of(basedir.getAbsolutePath(), "src/main/java")));

        assertEquals(1, project.getSourceRoots().size());

        // Try to remove a different directory
        project.removeSourceRoot(ProjectScope.MAIN, Language.JAVA_FAMILY, "src/test/java");

        assertEquals(1, project.getSourceRoots().size());

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

Die Datei `main.py` hätte als Inhalt:

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

Die Datei `test_main.py` hätte die Tests für `main.py`, das könnte jetzt so aussehen:

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

## Es ausführen { #run-it }

<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
```

	<property name="webinf.dir" value="${basedir}/src/main/webapp/WEB-INF" />
	<property name="crawler.dir" value="${basedir}/src/main/webapp/WEB-INF/env/crawler" />
	<property name="suggest.dir" value="${basedir}/src/main/webapp/WEB-INF/env/suggest" />
	<property name="thumbnail.dir" value="${basedir}/src/main/webapp/WEB-INF/env/thumbnail" />
	<property name="site.dir" value="${basedir}/src/main/webapp/WEB-INF/site" />

maven-core-it file:///${basedir}/repo true true . pom.xml src/** src/main/resources src/main/java/org/apache/maven/its/mng3906/SomeClass.java src/main/java/org/apache/maven/its/mng3906/SomeClass.java package org.apache.maven.its.mng3906; public class SomeClass { } META-INF/maven/org.apache.maven.its.mng3906/a/pom.xml 4.0.0 org.apache.maven.its.mng3906 a 0.1 jar maven-core-it file:///${basedir}/repo true true . pom.xml src/** src/main/resources META-INF/maven/org.apache.maven.its.mng3906/a/pom.properties...

maven-core-it file:///${basedir}/repo true true . pom.xml src/** src/main/resources src/main/java/org/apache/maven/its/mng3906/SomeClass.java src/main/java/org/apache/maven/its/mng3906/SomeClass.java package org.apache.maven.its.mng3906; public class SomeClass { } META-INF/maven/org.apache.maven.its.mng3906/b/pom.xml 4.0.0 org.apache.maven.its.mng3906 b 0.1 jar maven-core-it file:///${basedir}/repo true true . pom.xml src/** src/main/resources META-INF/maven/org.apache.maven.its.mng3906/b/pom.properties...

Найпростіший файл FastAPI може виглядати так:

{* ../../docs_src/first_steps/tutorial001.py *}

Скопіюйте це до файлу `main.py`.

Запустіть сервер:

<div class="termy">

```console
$ <font color="#4E9A06">fastapi</font> dev <u style="text-decoration-style:single">main.py</u>
<font color="#3465A4">INFO    </font> Using path <font color="#3465A4">main.py</font>

    #  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:{})

  tmp_dir=$(mktemp -d)
  cp "${src_jar}" "${tmp_dir}/orig.jar"
  pushd "${tmp_dir}"
  # Extract any src/ files
  jar -xf "${tmp_dir}/orig.jar" src/
  # Extract any org/ files under src/main/java
  (mkdir -p src/main/java && cd src/main/java && jar -xf "${tmp_dir}/orig.jar" org/)
  # Repackage src/
  jar -cMf "${tmp_dir}/new.jar" src
  popd
  cp "${tmp_dir}/new.jar" "${dest_jar}"
  rm -rf "${tmp_dir}"
}

DIR=$1