But that's not the only way to declare dependencies (although it would probably be the more common).

The key factor is that a dependency should be a "callable".

A "**callable**" in Python is anything that Python can "call" like a function.

So, if you have an object `something` (that might _not_ be a function) and you can "call" it (execute it) like:

```Python
something()
```

or

```Python

public interface RepositorySystemSessionFactory {
    /**
     * Creates "ready to use" session builder instance. The factory does not set up one thing: the
     * {@link org.eclipse.aether.repository.WorkspaceReader}s, that is caller duty to figure out. Workspace readers
     * should be set up as very last thing before using resolver session, that is built by invoking
     * {@link SessionBuilder#build()} method.
     *

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public final class PostMultipart {
  /**
   * The imgur client ID for OkHttp recipes. If you're using imgur for anything other than running
   * these examples, please request your own client ID! https://api.imgur.com/oauth2
   */
  private static final String IMGUR_CLIENT_ID = "9199fdef135c122";

                MavenProject currentProject = session.getCurrentProject();
                try {
                    BuilderCommon.attachToThread(project); // Not totally sure if this is needed for anything
                    session.setCurrentProject(project);
                    projectBuilds.add(new ProjectSegment(project, taskSegment, session));
                } finally {

              }
            }
          };
      thread.start();
      blockedThreads.add(thread);
    }
    for (int i = 0; i < numListeners; i++) {
      f.addListener(Runnables.doNothing(), directExecutor());
    }
    for (Thread thread : blockedThreads) {
      AbstractFutureBenchmarks.awaitWaiting(thread);
    }
    switch (state) {
      case NOT_DONE:
        break;
      case FINISHED:

     */
    public InvokerException(@Nullable String message, @Nullable Throwable cause) {
        super(message, cause);
    }

    /**
     * Exception for intentional exit: No message or anything will be displayed, just the
     * carried exit code will be returned from invoker {@link Invoker#invoke(InvokerRequest)} method.
     */
    public static final class ExitException extends InvokerException {

import java.util.concurrent.TimeUnit
import okhttp3.internal.connection.RealCall
import okhttp3.internal.finishedAccessor

/**
 * A fake executor for testing that never executes anything! Instead, it just keeps track of what's
 * been enqueued.
 */
internal class RecordingExecutor(
  private val dispatcherTest: DispatcherTest,
) : AbstractExecutorService() {
  private var shutdown: Boolean = false

This is different from using an `APIRouter` as a mounted application is completely independent. The OpenAPI and docs from your main application won't include anything from the mounted application, etc.

You can read more about this in the [Advanced User Guide](../advanced/index.md){.internal-link target=_blank}.

## Details { #details }

/// tip

If you have strict type checks in your editor, mypy, etc, you can declare the function return type as `Any`.

That way you tell the editor that you are intentionally returning anything. But FastAPI will still do the data documentation, validation, filtering, etc. with the `response_model`.

///

### `response_model` Priority { #response-model-priority }

        // win98 observed not returning nativeFileSystem
        /* Problems here with iSeries returning ASCII even though useUnicode = true
         * Fortunately we don't really need nativeFileSystem for anything.
        if( byteCount > bufferIndex - start ) {
            nativeFileSystem = readString( buffer, bufferIndex );
            bufferIndex += stringWireLength( nativeFileSystem, bufferIndex );
        }
        */