26, 20, 19, 22, 23, 22, 25, 26, 26, 26, 27, 27, 26, 24, 25, 19, 21, 26, 27, 27, 26, 27,
      24, 21, 21, 26, 26, 28, 27, 27, 27, 20, 24, 20, 21, 22, 21, 21, 23, 22, 22, 25, 25, 24,
      24, 26, 23, 26, 27, 26, 26, 27, 27, 27, 27, 27, 28, 27, 27, 27, 27, 27, 26,
    )

  private val root = Node()

  init {
    for (i in CODE_BIT_COUNTS.indices) {

=== "Python 3.10+"

    ```Python hl_lines="19-22  26-27"
    {!> ../../../docs_src/security/tutorial002_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="19-22  26-27"
    {!> ../../../docs_src/security/tutorial002_an_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="20-23  27-28"

* 等等。

=== "Python 3.10+"

    ```Python hl_lines="17  22  24-27"
    {!> ../../../docs_src/response_model/tutorial001_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="17  22  24-27"
    {!> ../../../docs_src/response_model/tutorial001_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="17  22  24-27"
    {!> ../../../docs_src/response_model/tutorial001.py!}
    ```

!!! note

```Python
q: str | None = None
```

For example:

=== "Python 3.10+"

    ```Python hl_lines="27"
    {!> ../../../docs_src/body_multiple_params/tutorial004_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="27"
    {!> ../../../docs_src/body_multiple_params/tutorial004_an_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="28"

# WebSockets testen

Sie können den schon bekannten `TestClient` zum Testen von WebSockets verwenden.

Dazu verwenden Sie den `TestClient` in einer `with`-Anweisung, eine Verbindung zum WebSocket herstellend:

```Python hl_lines="27-31"
{!../../../docs_src/app_testing/tutorial002.py!}
```

!!! note "Hinweis"

你可以通过传递额外信息给 `Field` 同样的方式操作`Path`, `Query`, `Body`等。

比如，你可以将请求体的一个 `example` 传递给 `Body`:

=== "Python 3.10+"

    ```Python hl_lines="22-27"
    {!> ../../../docs_src/schema_extra_example/tutorial003_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="22-27"
    {!> ../../../docs_src/schema_extra_example/tutorial003_an_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="23-28"

    {!> ../../../docs_src/path_operation_configuration/tutorial004_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="19-27"
    {!> ../../../docs_src/path_operation_configuration/tutorial004_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="19-27"
    {!> ../../../docs_src/path_operation_configuration/tutorial004.py!}
    ```

In der interaktiven Dokumentation sieht das dann so aus:

    {!> ../../../docs_src/path_operation_configuration/tutorial004_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="19-27"
    {!> ../../../docs_src/path_operation_configuration/tutorial004_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="19-27"
    {!> ../../../docs_src/path_operation_configuration/tutorial004.py!}
    ```

Он будет использован в интерактивной документации:

# 测试 WebSockets

测试 WebSockets 也使用 `TestClient`。

为此，要在 `with` 语句中使用 `TestClient` 连接 WebSocket。

```Python hl_lines="27-31"
{!../../../docs_src/app_testing/tutorial002.py!}
```

!!! note "笔记"

    bufferB.writeUtf8("You shouldn't use my name.\n")
    operatorB.write(9, bufferB, 27)
    bufferA.writeUtf8("Dodgson, we've got Dodgson here!\n")
    operatorA.write(36, bufferA, 33)
    operatorB.read(0, bufferB, 9)
    assertThat(bufferB.readUtf8()).isEqualTo("Dodgson!\n")
    operatorA.read(9, bufferA, 27)
    assertThat(bufferA.readUtf8()).isEqualTo("You shouldn't use my name.\n")