import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * An unbounded {@linkplain BlockingQueue blocking queue} that uses the same ordering rules as class
 * {@link PriorityQueue} and supplies blocking retrieval operations. While this queue is logically
 * unbounded, attempted additions may fail due to resource exhaustion (causing {@code

The commit messages that accompany your code changes are an important piece of documentation. Please follow these guidelines when creating commits:

* [Write good commit messages.](https://cbea.ms/git-commit/#seven-rules)

- Exited kube-proxy when configuration file changes ([#59176](https://github.com/kubernetes/kubernetes/pull/59176), [@dixudx](https://github.com/dixudx))
- kube-addon-manager was updated to v9.0, and now uses kubectl v1.13.2 and prunes workload resources via the apps/v1 API ([#72978](https://github.com/kubernetes/kubernetes/pull/72978), [@liggitt](https://github.com/liggitt))

```

////

//// tab | Python 3.9 і вище

```Python hl_lines="1"
{!> ../../docs_src/python_types/tutorial008_py39.py!}
```

////

Це означає:

* Змінна `prices` це `dict`:
    * Ключі цього `dict` типу `str` (наприклад, назва кожного елементу).
    * Значення цього `dict` типу `float` (наприклад, ціна кожного елементу).

#### Union (об'єднання)

#### 字典

定义 `dict` 时，需要传入两个子类型，用逗号进行分隔。

第一个子类型声明 `dict` 的所有键。

第二个子类型声明 `dict` 的所有值：

```Python hl_lines="1  4"
{!../../docs_src/python_types/tutorial008.py!}
```

这表示：

* 变量 `prices` 是一个 `dict`：
    * 这个 `dict` 的所有键为 `str` 类型（可以看作是字典内每个元素的名称）。
    * 这个 `dict` 的所有值为 `float` 类型（可以看作是字典内每个元素的价格）。

### 类作为类型

你也可以将类声明为变量的类型。

假设你有一个名为 `Person` 的类，拥有 name 属性：

    a.set(0, 1.0);
    Thread t =
        newStartedThread(
            new CheckedRunnable() {
              @Override
              @SuppressWarnings("ThreadPriorityCheck") // doing our best to test for races
              public void realRun() {
                while (!a.compareAndSet(0, 2.0, 3.0)) {
                  Thread.yield();
                }
              }
            });

      if (array[i] == target) {
        return i;
      }
    }
    return -1;
  }

  /**
   * Returns the least value present in {@code array}, using the same rules of comparison as {@link
   * Math#min(double, double)}.
   *
   * @param array a <i>nonempty</i> array of {@code double} values
   * @return the value present in {@code array} that is less than or equal to every other value in

첫 번째 매개변수는 `dict`의 키(key)이고,

두 번째 매개변수는  `dict`의 값(value)입니다.

```Python hl_lines="1  4"
{!../../docs_src/python_types/tutorial008.py!}
```

이 뜻은 아래와 같습니다:

* 변수 `prices`는 `dict`이다:
    * `dict`의 키(key)는 `str`타입이다. (각 아이템의 이름(name))
    * `dict`의 값(value)는 `float`타입이다. (각 아이템의 가격(price))

#### `Optional`

Now, for FastAPI, it will see the return type and make sure that what you return includes **only** the fields that are declared in the type.

FastAPI does several things internally with Pydantic to make sure that those same rules of class inheritance are not used for the returned data filtering, otherwise you could end up returning much more data than what you expected.

      new AtomicReference<>(immediateVoidFuture());

  private @LazyInit ThreadConfinedTaskQueue latestTaskQueue = new ThreadConfinedTaskQueue();

  /**
   * This object is unsafely published, but avoids problematic races by relying exclusively on the
   * identity equality of its Thread field so that the task field is only accessed by a single
   * thread.
   */
  private static final class ThreadConfinedTaskQueue {
    /**