You can define an attribute to be a subtype. For example, a Python `list`:

{* ../../docs_src/body_nested_models/tutorial001_py310.py hl[12] *}

This will make `tags` be a list, although it doesn't declare the type of the elements of the list.

## List fields with type parameter { #list-fields-with-type-parameter }

But Python has a specific way to declare lists with internal types, or "type parameters":

    }

    /**
     * Returns a list of core extensions from all sources, that were discovered and loaded. Each instance of
     * {@link CoreExtensions} is validated, but the list elements may have overlapping elements, that requires
     * some logic to sort out (like precedence).
     * <p>
     * The list of {@link CoreExtensions} if present, is in precedence order.
     *

    }
  }

  /**
   * Sorts the array, treating its elements as unsigned 64-bit integers.
   *
   * @since 23.1
   */
  public static void sort(long[] array) {
    checkNotNull(array);
    sort(array, 0, array.length);
  }

  /**
   * Sorts the array between {@code fromIndex} inclusive and {@code toIndex} exclusive, treating its
   * elements as unsigned 64-bit integers.
   *
   * @since 23.1
   */

        List<Profile> active = selector.getActiveProfiles(profiles, context, problems);
        assertTrue(
                active.isEmpty(), "Expected collection to be empty but had " + active.size() + " elements: " + active);
        assertEquals(1, problems.getErrors().size());
        assertEquals(
                "Failed to determine activation for profile one: BOOM",
                problems.getErrors().get(0));
    }

public interface ExecutionEvent {

    /**
     * The possible types of execution events.
     *
     * Note: do not modify this enum, or, make sure that this enum and
     * {@link org.apache.maven.api.EventType} have same elements in same order.
     */
    enum Type {
        ProjectDiscoveryStarted,
        SessionStarted,
        SessionEnded,
        ProjectSkipped,
        ProjectStarted,
        ProjectSucceeded,

import static java.util.stream.Collectors.collectingAndThen;
import static java.util.stream.Collectors.toMap;

/**
 * Provides information about artifacts (identified by groupId:artifactId string key) and classpath elements exported by
 * Maven core itself and loaded Maven core extensions.
 *
 * @since 3.3.0
 */
public class CoreExports {
    private final Set<String> artifacts;

    private final Map<String, ClassLoader> packages;

        File f = getFileForClasspathResource("canonical-pom.xml");

        MavenProject project = getProject(f);

        // ----------------------------------------------------------------------
        // Top-level elements
        // ----------------------------------------------------------------------

        assertEquals("4.0.0", project.getModelVersion());

        // ----------------------------------------------------------------------

    extendsFrom(manifestClasspath.get())
    configureAsRuntimeJarClasspath(objects)
}

tasks.jar.configure {
    val classpath = resolveManifestClasspath.flatMap { configuration ->
        configuration.elements.map { classpathDependency ->
            classpathDependency.joinToString(" ") { it.asFile.name }
        }
    }
    manifest.attributes("Class-Path-Source" to "manifestClasspath")

import java.util.Collection;
import java.util.Map.Entry;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Creates multimaps, containing sample elements, to be tested.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
@NullMarked
public interface TestMultimapGenerator<
        K extends @Nullable Object, V extends @Nullable Object, M extends Multimap<K, V>>

import java.util.Collection;
import java.util.Map.Entry;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Creates multimaps, containing sample elements, to be tested.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
@NullMarked
public interface TestMultimapGenerator<
        K extends @Nullable Object, V extends @Nullable Object, M extends Multimap<K, V>>