FastAPI will make sure it's run correctly so that it doesn't block the event loop.

As in this case the function is not async, the right return type would be `Iterable[Item]`:

{* ../../docs_src/stream_json_lines/tutorial001_py310.py ln[27:30] hl[28] *}

### No Return Type { #no-return-type }

  /**
   * Returns the first of two given parameters that is not {@code null}, if either is, or otherwise
   * throws a {@link NullPointerException}.
   *
   * <p>To find the first non-null element in an iterable, use {@code Iterables.find(iterable,
   * Predicates.notNull())}. For varargs, use {@code Iterables.find(Arrays.asList(a, b, c, ...),
   * Predicates.notNull())}, static importing as necessary.
   *

import static java.text.DateFormat.LONG;
import static java.text.DateFormat.MEDIUM;
import static java.text.DateFormat.SHORT;
import static java.text.DateFormat.getDateInstance;
import static org.codelibs.core.collection.MultiIterator.iterable;
import static org.codelibs.core.lang.StringUtil.isEmpty;
import static org.codelibs.core.lang.StringUtil.isNotEmpty;
import static org.codelibs.core.misc.AssertionUtil.assertArgumentNotNull;

import java.text.DateFormat;

   * {@link Multimap} interface.
   *
   * <p>Any duplicates in {@code values} will be stored in the multimap once.
   */
  @CanIgnoreReturnValue
  @Override
  SortedSet<V> replaceValues(@ParametricNullness K key, Iterable<? extends V> values);

  /**
   * Returns a map view that associates each key with the corresponding values in the multimap.
   * Changes to the returned map, such as element removal, will update the underlying multimap. The

FastAPI s’assure qu’elles s’exécutent correctement pour ne pas bloquer la boucle d’événements.

Dans ce cas la fonction n’est pas async, le type de retour approprié serait `Iterable[Item]` :

{* ../../docs_src/server_sent_events/tutorial001_py310.py ln[28:31] hl[29] *}

### Sans type de retour { #no-return-type }

///

### 비동기 아님 *경로 처리 함수* { #non-async-path-operation-functions }

일반 `def` 함수(`async` 없이)도 사용할 수 있으며, 동일하게 `yield`를 사용할 수 있습니다.

FastAPI가 이벤트 루프를 막지 않도록 올바르게 실행되게 보장합니다.

이 경우 함수가 async가 아니므로, 올바른 반환 타입은 `Iterable[Item]`입니다:

{* ../../docs_src/stream_json_lines/tutorial001_py310.py ln[27:30] hl[28] *}

### 반환 타입 생략 { #no-return-type }

///

### 非异步的*路径操作函数* { #non-async-path-operation-functions }

你也可以使用常规的 `def` 函数（不带 `async`），并以同样的方式使用 `yield`。

FastAPI 会确保其正确运行，不会阻塞事件循环。

因为这个函数不是异步的，合适的返回类型是 `Iterable[Item]`：

{* ../../docs_src/stream_json_lines/tutorial001_py310.py ln[27:30] hl[28] *}

### 无返回类型 { #no-return-type }

  }

  // TODO(cpovirk): should we reject null items, since the tests already check null automatically?
  @CanIgnoreReturnValue
  public RelationshipTester<T> addRelatedGroup(Iterable<? extends T> group) {
    groups.add(ImmutableList.copyOf(group));
    return this;
  }

  public void test() {
    for (int groupNumber = 0; groupNumber < groups.size(); groupNumber++) {

    checkNotNull(loader);
    return new CacheLoader<K, V>() {
      @Override
      public V load(K key) throws Exception {
        return loader.load(key);
      }

      @Override
      public Map<K, V> loadAll(Iterable<? extends K> keys) throws Exception {
        Map<K, V> result = new HashMap<>(); // allow nulls
        for (K key : keys) {
          result.put(key, load(key));
        }
        return result;
      }
    };

 *
 * {@snippet :
 * class MySubtypeTests extends SubtypeTester {
 *   @TestSubtype(suppressGetSubtype = true, suppressGetSupertype = true)
 *   public <T> Iterable<? extends T> listIsSubtypeOfIterable(List<T> list) {
 *     return isSubtype(list);
 *   }
 *
 *   @TestSubtype
 *   public List<String> intListIsNotSubtypeOfStringList(List<Integer> intList) {