Это более или менее "продвинутая" идея.

Если вы только начинаете работать с **FastAPI**, то лучше пока пропустить этот пункт.

///

В Python для создания менеджеров контекста можно <a href="https://docs.python.org/3/reference/datamodel.html#context-managers" class="external-link" target="_blank">создать класс с двумя методами: `__enter__()` и `__exit__()`</a>.

Вы также можете использовать их внутри зависимостей **FastAPI** с `yield`, используя операторы

  return result;
}

// Used as an argument to TFE_NewCustomDeviceTensorHandle, indicating how
// ParallelTensors wrapped in TFE_TensorHandles should be cleaned up once their
// reference counts drop to zero.
void ParallelTensorDeallocator(void* data) {
  delete reinterpret_cast<ParallelTensor*>(data);
}

// Used as an argument to TFE_NewCustomDeviceTensorHandle, for computing the

 * TODO(user): Differentiate between directed and undirected edge strings.
 */
public abstract class AbstractGraphTest {

  Graph<Integer> graph;

  /**
   * The same reference as {@link #graph}, except as a mutable graph. This field is null in case
   * {@link #createGraph()} didn't return a mutable graph.
   */
  MutableGraph<Integer> graphAsMutableGraph;

  static final Integer N1 = 1;

                ),
                listOf(
                  AttributeTypeAndValue(
                    type = ORGANIZATIONAL_UNIT_NAME,
                    value = "www.entrust.net/CPS is incorporated by reference",
                  ),
                ),
                listOf(
                  AttributeTypeAndValue(
                    type = ORGANIZATIONAL_UNIT_NAME,
                    value = "(c) 2006 Entrust, Inc.",

      We could probably have resumed it after https://github.com/google/guava/pull/6664.
      But it's always weird that published poms reference test-only libraries at all, so I'm not in any rush to do so.
      -->
    </dependencies>
  </dependencyManagement>
  <profiles>
    <profile>
        <id>sonatype-oss-release</id>
        <build>

public final class ImmutableSortedMap<K, V> extends ForwardingImmutableMap<K, V>
    implements SortedMap<K, V> {

  @SuppressWarnings("unchecked")
  static final Comparator<?> NATURAL_ORDER = Ordering.natural();

  // This reference is only used by GWT compiler to infer the keys and values
  // of the map that needs to be serialized.
  private @Nullable Comparator<? super K> unusedComparatorForSerialization;
  private @Nullable K unusedKeyForSerialization;

      We could probably have resumed it after https://github.com/google/guava/pull/6664.
      But it's always weird that published poms reference test-only libraries at all, so I'm not in any rush to do so.
      -->
    </dependencies>
  </dependencyManagement>
  <profiles>
    <profile>
        <id>sonatype-oss-release</id>
        <build>

This is, more or less, an "advanced" idea.

If you are just starting with **FastAPI** you might want to skip it for now.

///

In Python, you can create Context Managers by <a href="https://docs.python.org/3/reference/datamodel.html#context-managers" class="external-link" target="_blank">creating a class with two methods: `__enter__()` and `__exit__()`</a>.

You can also use them inside of **FastAPI** dependencies with `yield` by using

    assertThat(Doubles.toArray(list.subList(2, 2))).isEmpty();
  }

  public void testAsListEmpty() {
    assertThat(Doubles.asList(EMPTY)).isSameInstanceAs(Collections.emptyList());
  }

  /**
   * A reference implementation for {@code tryParse} that just catches the exception from {@link
   * Double#valueOf}.
   */
  private static @Nullable Double referenceTryParse(String input) {

 * TODO(user): Differentiate between directed and undirected edge strings.
 */
public abstract class AbstractNetworkTest {

  Network<Integer, String> network;

  /**
   * The same reference as {@link #network}, except as a mutable network. This field is null in case
   * {@link #createGraph()} didn't return a mutable network.
   */
  MutableNetwork<Integer, String> networkAsMutableNetwork;