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

In the file `main.py` you have your **FastAPI** app:


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

### Testing file { #testing-file }

# Advanced User Guide { #advanced-user-guide }

## Additional Features { #additional-features }

The main [Tutorial - User Guide](../tutorial/index.md){.internal-link target=_blank} should be enough to give you a tour through all the main features of **FastAPI**.

In the next sections you will see other options, configurations, and additional features.

/// tip

The next sections are **not necessarily "advanced"**.

        <action android:name="android.intent.action.MAIN" />

        <category android:name="android.intent.category.LAUNCHER" />
      </intent-filter>
    </activity>

    <activity
      android:name=".MainActivity2"
      android:process=":activity2"
      android:exported="true">
      <intent-filter>
        <action android:name="android.intent.action.MAIN" />

        <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting server
                Searching for package file structure
        ```
        »»»

    Result (German):

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

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

 *     <li>{@linkplain Project#getPomArtifact() the project POM artifact}</li>
 *     <li>{@linkplain Project#getMainArtifact() the main artifact}</li>
 *     <li>{@linkplain org.apache.maven.api.services.ProjectManager#attachArtifact(Session, Project, Path) artifacts to be attached to a project}</li>
 * </ul>
 *
 * <p>For the main artifact and attached artifacts, the
 * {@link org.apache.maven.api.services.ArtifactManager ArtifactManager} service must be used

     * circumstances.
     */
    public static void main(String[] args) throws IOException {
        int exitCode = new MavenCling().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 {

    default ProducedArtifact getPomArtifact() {
        return getArtifacts().get(0);
    }

    /**
     * {@return the project main artifact}, which is the artifact produced by this project build, if applicable.
     * This artifact MAY be absent if the project is actually not producing any main artifact (i.e. "pom" packaging).
     *
     * @see #getPackaging()
     * @see org.apache.maven.api.services.ArtifactManager#getPath(Artifact)

        "platforms/documentation/docs/src/docs/release/release-notes-assets/",
        "subprojects/launcher/src/main/resources/release-features.txt",
        "platforms/core-runtime/launcher/src/main/resources/release-features.txt"
    ]

    static void main(String[] args) {
        if (args.length != 1) {
            System.err.println("Usage: groovy CheckBadMerge.groovy <commits_file>")

      if (closed) return

      if (bytesRemaining != 0L &&
        !discard(ExchangeCodec.DISCARD_STREAM_TIMEOUT_MILLIS, MILLISECONDS)
      ) {
        carrier.noNewExchanges() // Unread bytes remain on the stream.
        responseBodyComplete(TRAILERS_RESPONSE_BODY_TRUNCATED)
      }

      closed = true
    }
  }

  /** An HTTP body with alternating chunk sizes and chunk bodies. */