Como o Pydantic fará a serialização no lado em **Rust**, você terá uma **performance** muito maior do que se não declarar um tipo de retorno.

///

### Funções de operação de rota não assíncronas { #non-async-path-operation-functions }

Você também pode usar funções `def` normais (sem `async`) e usar `yield` da mesma forma.

O FastAPI garantirá que sejam executadas corretamente para não bloquear o event loop.

    //                                               -------
    /**
     * Displays the details of a scheduled job.
     *
     * @param crudMode the CRUD mode for the operation
     * @param id the ID of the scheduled job to display
     * @return HTML response for the job details page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })

  /**
   * {@inheritDoc}
   *
   * <p>This implementation is guaranteed to throw an {@link UnsupportedOperationException}.
   *
   * @throws UnsupportedOperationException always
   * @deprecated Unsupported operation.
   */
  @CanIgnoreReturnValue
  @Deprecated
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  public final @Nullable Entry<E> pollFirstEntry() {

  /**
   * An alternate form of {@code put} that silently removes any existing entry with the value {@code
   * value} before proceeding with the {@link #put} operation. If the bimap previously contained the
   * provided key-value mapping, this method has no effect.
   *
   * <p>Note that a successful call to this method could cause the size of the bimap to increase by

        String[] msgs = DosError.DOS_ERROR_MESSAGES;

        // Assert
        assertNotNull(msgs);
        assertTrue(msgs.length >= 3, "Expect at least the first 3 entries present");
        assertEquals("The operation completed successfully.", msgs[0]);
        assertEquals("Incorrect function.", msgs[1]);
        assertEquals("Incorrect function.", msgs[2]);
    }

    @Test

    @Test
    @DisplayName("Should create SmbException with cause")
    void testSmbExceptionWithCause() {
        // Given
        Exception cause = new RuntimeException("Root cause");
        String message = "SMB operation failed";

        // When
        SmbException exception = new SmbException(message, cause);

        // Then
        assertNotNull(exception);
        assertEquals(message, exception.getMessage());

/// tip | Порада

Оскільки Pydantic серіалізує це на боці **Rust**, ви отримаєте значно вищу **продуктивність**, ніж якби не оголошували тип повернення.

///

### Не-async *функції операцій шляху* { #non-async-path-operation-functions }

Ви також можете використовувати звичайні функції `def` (без `async`) і використовувати `yield` так само.

FastAPI подбає про коректне виконання, щоб воно не блокувало цикл подій.

from starlette.datastructures import UploadFile as StarletteUploadFile


class UploadFile(StarletteUploadFile):
    """
    A file uploaded in a request.

    Define it as a *path operation function* (or dependency) parameter.

    If you are using a regular `def` function, you can use the `upload_file.file`
    attribute to access the raw standard Python file (blocking, not async), useful and

// goiOpts := os.GetOpts()
// gerr := objAPI.GetObjectInfo(ctx, bucket, object, goiOpts)
//
//	if gerr == nil {
//	   os.SetTransitionState(goi)
//	}
//
// // After the overwriting object operation is complete.
//
//	if jentry, ok := os.ShouldRemoveRemoteObject(); ok {
//	    err := globalTierJournal.AddEntry(jentry)
//	    logger.LogIf(ctx, err)
//	}
type objSweeper struct {
	Object              string

func (r *Reader) UnreadRune() error {
	if r.i <= 0 {
		return errors.New("bytes.Reader.UnreadRune: at beginning of slice")
	}
	if r.prevRune < 0 {
		return errors.New("bytes.Reader.UnreadRune: previous operation was not ReadRune")
	}
	r.i = int64(r.prevRune)
	r.prevRune = -1
	return nil
}

// Seek implements the [io.Seeker] interface.
func (r *Reader) Seek(offset int64, whence int) (int64, error) {