file.read()
```

En versiones recientes de Python, también hay un **async context manager**. Lo usarías con `async with`:

```Python
async with lifespan(app):
    await do_stuff()
```

Cuando creas un context manager o un async context manager como arriba, lo que hace es que, antes de entrar al bloque `with`, ejecutará el código antes del `yield`, y al salir del bloque `with`, ejecutará el código después del `yield`.

Vários deles são explorados nos próximos capítulos do tutorial.

## A ordem importa { #order-matters }

Ao criar *operações de rota*, você pode encontrar situações em que tem um path fixo.

Como `/users/me`, digamos que seja para obter dados sobre o usuário atual.

     * @return HTML response for the path mapping list page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse reset(final SearchForm form) {
        pathMapPager.clear();
        return asHtml(path_AdminPathmap_AdminPathmapJsp).renderWith(data -> {
            searchPaging(data, form);
        });
    }

    /**

    Stopwatch timer = Stopwatch.createStarted();
    Queues.drainUninterruptibly(q, new ArrayList<>(), 1, 10, MILLISECONDS);
    assertThat(timer.elapsed(MILLISECONDS)).isAtLeast(10L);
    // wait for interrupted status and clear it
    while (!Thread.interrupted()) {
      Thread.yield();
    }
  }

  private static class Producer implements Callable<@Nullable Void> {
    final BlockingQueue<Object> q;
    final int elements;

				err = msgp.WrapError(err, "OldDataDir")
				return
			}
			zb0001Mask |= 0x1
		default:
			err = dc.Skip()
			if err != nil {
				err = msgp.WrapError(err)
				return
			}
		}
	}
	// Clear omitted fields.
	if (zb0001Mask & 0x1) == 0 {
		z.OldDataDir = ""
	}

	return
}

// EncodeMsg implements msgp.Encodable
func (z *DeleteOptions) EncodeMsg(en *msgp.Writer) (err error) {

        }
        try {
            // TODO transaction?
            urlQueueService.delete(sessionId);
            dataService.delete(sessionId);
            urlFilter.clear();
            if (logger.isInfoEnabled()) {
                logger.info("Completed crawler cleanup: sessionId={}", sessionId);
            }
        } catch (final Exception e) {

        List<CompletableFuture<Void>> taskFutures = new ArrayList<>(asyncNotifyTasks.values());
        for (CompletableFuture<Void> task : taskFutures) {
            task.cancel(true);
        }
        asyncNotifyTasks.clear();

        // Unregister all active registrations
        List<CompletableFuture<Void>> unregisterFutures = new ArrayList<>();

        for (WitnessRegistration registration : registrations.values()) {

        entries[previous] = swapNext(entry, dstIndex);
      }
    } else {
      keys[dstIndex] = null;
      values[dstIndex] = 0;
      entries[dstIndex] = UNSET;
    }
  }

  public void clear() {
    modCount++;
    Arrays.fill(keys, 0, size, null);
    Arrays.fill(values, 0, size, 0);
    Arrays.fill(table, UNSET);
    Arrays.fill(entries, UNSET);
    this.size = 0;
  }

### "Plug-ins" illimités

Ou, en d'autres termes, pas besoin d'eux, importez le code que vous voulez et utilisez le.

Tout intégration est conçue pour être si simple à utiliser (avec des dépendances) que vous pouvez créer un "plug-in" pour votre application en deux lignes de code utilisant la même syntaxe que celle de vos *path operations*

### Testé

func (l *ReplicationLastHour) forwardTo(t int64) {
	if l.LastMin >= t {
		return
	}
	if t-l.LastMin >= 60 {
		l.Totals = [60]AccElem{}
		return
	}
	for l.LastMin != t {
		// Clear next element.
		idx := (l.LastMin + 1) % 60
		l.Totals[idx] = AccElem{}
		l.LastMin++
	}
}

// BucketStatsMap captures bucket statistics for all buckets
type BucketStatsMap struct {