Puedes establecer `"json_schema_extra"` con un `dict` que contenga cualquier dato adicional que desees que aparezca en el JSON Schema generado, incluyendo `examples`.

////

//// tab | Pydantic v1

 * That can be expensive.
 *
 * @author Mark Davis
 * @author Kevin Bourrillion
 * @since 2.0
 */
@GwtCompatible
public abstract class ComparisonChain {
  private ComparisonChain() {}

  /** Begins a new chained comparison statement. See example in the class documentation. */
  public static ComparisonChain start() {
    return ACTIVE;
  }

  private static final ComparisonChain ACTIVE =

        waiterThreadUpdater = lookup.findVarHandle(Waiter.class, "thread", Thread.class);
        waiterNextUpdater = lookup.findVarHandle(Waiter.class, "next", Waiter.class);
        waitersUpdater =
            lookup.findVarHandle(AbstractFutureState.class, "waitersField", Waiter.class);
        listenersUpdater =
            lookup.findVarHandle(AbstractFutureState.class, "listenersField", Listener.class);

        AtomicReferenceFieldUpdater.<Waiter, @Nullable Waiter>newUpdater(
            Waiter.class, Waiter.class, "next");
    private static final AtomicReferenceFieldUpdater<
            ? super AbstractFutureState<?>, @Nullable Waiter>
        waitersUpdater = newUpdater(AbstractFutureState.class, Waiter.class, "waitersField");
    private static final AtomicReferenceFieldUpdater<

/// info | Información

`OAuth2PasswordRequestForm` no es una clase especial para **FastAPI** como lo es `OAuth2PasswordBearer`.

`OAuth2PasswordBearer` hace que **FastAPI** sepa que es un esquema de seguridad. Así que se añade de esa manera a OpenAPI.

Pero `OAuth2PasswordRequestForm` es solo una dependencia de clase que podrías haber escrito tú mismo, o podrías haber declarado parámetros de `Form` directamente.

// check the order if so.
// TODO: Refactor to share code with SetTestBuilder etc.
@GwtCompatible
@NullMarked
public abstract class MapInterfaceTest<K extends @Nullable Object, V extends @Nullable Object>
    extends TestCase {

  /** A key type that is not assignable to any classes but Object. */
  private static final class IncompatibleKeyType {
    @Override

                            // as it would pull in dependency on:
                            // - maven-plugin-api (for model)
                            // - Plexus Container (for model supporting classes and exceptions)
                            XmlNode root = XmlService.read(is, null);
                            String groupId = mayGetChild(root, "groupId");

   * </pre>
   */
  private static class ExampleStackTrace extends IllegalStateException {

    static final StackTraceElement[] EMPTY_STACK_TRACE = new StackTraceElement[0];

    static final ImmutableSet<String> EXCLUDED_CLASS_NAMES =
        ImmutableSet.of(
            CycleDetectingLockFactory.class.getName(),
            ExampleStackTrace.class.getName(),
            LockGraphNode.class.getName());

    }
    size++;
    return node;
  }

  /**
   * Removes the specified node from the linked list. This method is only intended to be used from
   * the {@code Iterator} classes. See also {@link LinkedListMultimap#removeAllNodes(Object)}.
   */
  private void removeNode(Node<K, V> node) {
    if (node.previous != null) {
      node.previous.next = node.next;
    } else { // node was head

* `list`
* `tuple`
* `set`
* `dict`

И generics из модуля `typing`:

* `Union`
* `Optional`
* ...и другие.

////

### Классы как типы { #classes-as-types }

Вы также можете объявлять класс как тип переменной.

Допустим, у вас есть класс `Person` с именем:

{* ../../docs_src/python_types/tutorial010_py39.py hl[1:3] *}