private volatile boolean connected;

    protected Scroll scrollForDelete = new Scroll(TimeValue.timeValueMinutes(1));

    protected int sizeForDelete = 10;

    protected long retryInterval = 3 * 1000L;

    protected int maxRetryCount = 5;

    protected long connTimeout = 180 * 1000L;

    protected String searchPreference;

    protected String[] targetIndices;

```

### 使用省略号(`...`)声明必需参数

有另一种方法可以显式的声明一个值是必需的，即将默认参数的默认值设为 `...` ：

```Python hl_lines="7"
{!../../docs_src/query_params_str_validations/tutorial006b.py!}
```

/// info

如果你之前没见过 `...` 这种用法：它是一个特殊的单独值，它是 <a href="https://docs.python.org/3/library/constants.html#Ellipsis" class="external-link" target="_blank">Python 的一部分并且被称为「省略号」</a>。
Pydantic 和 FastAPI 使用它来显式的声明需要一个值。

///

    end
    Note over dep: After yield
    opt Handle other exception
        dep -->> dep: Handle exception, can't change response. E.g. close DB session.
    end
```

/// info | "Дополнительная информация"

Клиенту будет отправлен только **один ответ**. Это может быть один из ответов об ошибке или это будет ответ от *операции пути*.

# A Pydantic model
class User(BaseModel):
    id: int
    name: str
    joined: date
```

Sau đó có thể được sử dụng:

```Python
my_user: User = User(id=3, name="John Doe", joined="2018-07-19")

second_user_data = {
    "id": 4,
    "name": "Mary",
    "joined": "2018-11-30",
}

my_second_user: User = User(**second_user_data)
```

/// info

`**second_user_data` nghĩa là:

# A Pydantic model
class User(BaseModel):
    id: int
    name: str
    joined: date
```

可以像这样来使用：

```Python
my_user: User = User(id=3, name="John Doe", joined="2018-07-19")

second_user_data = {
    "id": 4,
    "name": "Mary",
    "joined": "2018-11-30",
}

my_second_user: User = User(**second_user_data)
```


/// info

`**second_user_data` 意思是:

    val encoded = CertificateAdapters.certificate.toDer(decoded)

    assertThat(encoded).isEqualTo(certificateByteString)
  }

  @Test
  fun `private key info`() {
    val privateKeyInfoByteString =
      (
        "MIICdQIBADANBgkqhkiG9w0BAQEFAASCAl8wggJbAgEAAoGBAICkUeG2stqf" +
          "byr6gyiVm5pN9YEDRXlowi+rfYGyWhC7ouW9fXAnhgShQKMOU862mG3tcttSYGdsjM3z1crhQlUzpKqncrzwqbzP" +

            }
        }

        Path target = getArtifactPath(
                artifact.getGroupId(), artifact.getArtifactId(), artifact.getVersion(), classifier, extension);
        try {
            LOGGER.info("Copying {} to project local repository", artifact);
            Files.createDirectories(target.getParent());
            Files.copy(
                    artifact.getPath(),
                    target,

## 安装 `PyJWT`

安装 `PyJWT`，在 Python 中生成和校验 JWT 令牌：

<div class="termy">

```console
$ pip install pyjwt

---> 100%
```

</div>

/// info | "说明"

如果您打算使用类似 RSA 或 ECDSA 的数字签名算法，您应该安装加密库依赖项 `pyjwt[crypto]`。

您可以在 <a href="https://pyjwt.readthedocs.io/en/latest/installation.html" class="external-link" target="_blank">PyJWT Installation docs</a> 获得更多信息。

///

MODULE$; public static void <clinit>(); public static int byteswap32(int); private void package$(); } scala/util/hashing/MurmurHash3.class package scala.util.hashing; public synchronized class MurmurHash3 { public static int mix(int, int); private static int mixLast(int, int); private static int finalizeHash(int, int); public final int productHash$1f126290(scala.Product); public final int unorderedHash(scala.collection.TraversableOnce, int); public final int orderedHash(scala.collection.TraversableOnce,...

```Python hl_lines="1"
async def get_burgers(number: int):
    # Do some asynchronous stuff to create the burgers
    return burgers
```

...instead of `def`:

```Python hl_lines="2"
# This is not asynchronous
def get_sequential_burgers(number: int):
    # Do some sequential stuff to create the burgers
    return burgers
```