C unfiltered = createUnfiltered(contents);
        C filtered1 = filter(unfiltered, EVEN);
        C filtered2 = filter(filtered1, PRIME_DIGIT);

        C inverseFiltered =
            filter(createUnfiltered(contents), Predicates.not(Predicates.and(EVEN, PRIME_DIGIT)));

        filtered2.clear();
        assertThat(unfiltered).containsExactlyElementsIn(inverseFiltered);
      }
    }
  }

        C unfiltered = createUnfiltered(contents);
        C filtered1 = filter(unfiltered, EVEN);
        C filtered2 = filter(filtered1, PRIME_DIGIT);

        C inverseFiltered =
            filter(createUnfiltered(contents), Predicates.not(Predicates.and(EVEN, PRIME_DIGIT)));

        filtered2.clear();
        assertThat(unfiltered).containsExactlyElementsIn(inverseFiltered);
      }
    }
  }

```Python hl_lines="7"
{!../../../docs_src/first_steps/tutorial003.py!}
```

!!! note "Nota"
    Si no sabes la diferencia, revisa el [Async: *"¿Tienes prisa?"*](../async.md#tienes-prisa){.internal-link target=_blank}.

### Paso 5: devuelve el contenido

```Python hl_lines="8"
{!../../../docs_src/first_steps/tutorial001.py!}
```

             * plugins that require dependency resolution although they usually run in phases of the build where project
             * artifacts haven't been assembled yet. The prime example of this is "mvn release:prepare".
             */
            if (aggregating && areAllDependenciesInReactor(session.getProjects(), result.getUnresolvedDependencies())) {

 * #minValue} and {@link #maxValue} should also be overridden for bounded types.
 *
 * <p>A discrete domain always represents the <i>entire</i> set of values of its type; it cannot
 * represent partial domains such as "prime integers" or "strings of length 5."
 *
 * <p>See the Guava User Guide section on <a href=
 * "https://github.com/google/guava/wiki/RangesExplained#discrete-domains">{@code
 * DiscreteDomain}</a>.
 *

 * #minValue} and {@link #maxValue} should also be overridden for bounded types.
 *
 * <p>A discrete domain always represents the <i>entire</i> set of values of its type; it cannot
 * represent partial domains such as "prime integers" or "strings of length 5."
 *
 * <p>See the Guava User Guide section on <a href=
 * "https://github.com/google/guava/wiki/RangesExplained#discrete-domains">{@code
 * DiscreteDomain}</a>.
 *

    This is useful when we use ConstrainedDecimal to represent Numeric(x,0)
    where a integer (but not int typed) is used. Encoding this as a float
    results in failed round-tripping between encode and parse.
    Our Id type is a prime example of this.

    >>> decimal_encoder(Decimal("1.0"))
    1.0

    >>> decimal_encoder(Decimal("1"))
    1
    """
    if dec_value.as_tuple().exponent >= 0:  # type: ignore[operator]

@app.get("/items/{item_id}")
async def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

**Nota**:

Si no lo sabes, revisa la sección _"¿Con prisa?"_ sobre <a href="https://fastapi.tiangolo.com/es/async/#con-prisa" target="_blank">`async` y `await` en la documentación</a>.

</details>

### Córrelo

Corre el servidor con:

<div class="termy">

```console

# Concurrencia y async / await

Detalles sobre la sintaxis `async def` para *path operation functions* y un poco de información sobre código asíncrono, concurrencia y paralelismo.

## ¿Tienes prisa?

<abbr title="too long; didn't read"><strong>TL;DR:</strong></abbr>

Si estás utilizando libraries de terceros que te dicen que las llames con `await`, del tipo:

```Python
results = await some_library()
```

    ByteStreams.copy(inChannel, outChannel);
    assertThat(out.toByteArray()).isEqualTo(expected);
  }


  public void testCopyFileChannel() throws IOException {
    final int chunkSize = 14407; // Random prime, unlikely to match any internal chunk size
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    WritableByteChannel outChannel = Channels.newChannel(out);

    File testFile = createTempFile();