///

然后，当您创建该 `Settings` 类的实例（在此示例中是 `settings` 对象）时，Pydantic 将以不区分大小写的方式读取环境变量，因此，大写的变量 `APP_NAME` 仍将为属性 `app_name` 读取。

然后，它将转换和验证数据。因此，当您使用该 `settings` 对象时，您将获得您声明的类型的数据（例如 `items_per_user` 将为 `int` 类型）。

### 使用 `settings`

然后，您可以在应用程序中使用新的 `settings` 对象：

```Python hl_lines="18-20"
{!../../docs_src/settings/tutorial001.py!}
```

### 运行服务器

{!> ../../docs_src/query_params_str_validations/tutorial013.py!}
```

////

/// note | "Hinweis"

Beachten Sie, dass FastAPI in diesem Fall den Inhalt der Liste nicht überprüft.

Zum Beispiel würde `List[int]` überprüfen (und dokumentieren) dass die Liste Ganzzahlen enthält. `list` alleine macht das nicht.

///

## Deklarieren von mehr Metadaten

Sie können mehr Informationen zum Parameter hinzufügen.

  // Allowing surge implies the possibility that the resources consumed by the
  // daemonset on any given node can double if the readiness check fails, and
  // so resource intensive daemonsets should take into account that they may
  // cause evictions during disruption.
  // +optional
  optional k8s.io.apimachinery.pkg.util.intstr.IntOrString maxSurge = 2;
}

// Spec to control the desired behavior of rolling update.

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

...`def`를 사용하는 대신:

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

`await` が機能するためには、非同期処理をサポートする関数内にある必要があります。これは、`async def` で関数を宣言するだけでよいです:

```Python hl_lines="1"
async def get_burgers(number: int):
    # ハンバーガーを作成するために非同期処理を実行
    return burgers
```

...`def` のかわりに:

```Python hl_lines="2"
# 非同期ではない
def get_sequential_burgers(number: int):
    # ハンバーガーを作成するためにシーケンシャルな処理を実行
    return burgers
```

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

### 📁

🔜 🎏 🏗 📁 ✍ 📁 `Dockerfile` ⏮️:

```{ .dockerfile .annotate }
# (1)
FROM python:3.9

# (2)

  - The schema for the alpha `CSINodeInfo` CRD has been split into `spec` and `status` fields, and new fields `status.available` and `status.volumePluginMechanism` added. Clusters using the previous alpha schema must delete and recreate the CRD using the new schema. ([#70515](https://github.com/kubernetes/kubernetes/pull/70515),...

  fun bodyGet204() {
    setLevel(Level.BODY)
    bodyGetNoBody(204)
  }

  @Test
  fun bodyGet205() {
    setLevel(Level.BODY)
    bodyGetNoBody(205)
  }

  private fun bodyGetNoBody(code: Int) {
    server.enqueue(
      MockResponse.Builder()
        .status("HTTP/1.1 $code No Content")
        .build(),
    )
    val response = client.newCall(request().build()).execute()
    response.body.close()

		exportContent[k] = []byte(v)
	}

	var importContent []byte
	{
		var b bytes.Buffer
		zipWriter := zip.NewWriter(&b)
		rawDataFn := func(r io.Reader, filename string, sz int) error {
			header, zerr := zip.FileInfoHeader(dummyFileInfo{
				name:    filename,
				size:    int64(sz),
				mode:    0o600,
				modTime: time.Now(),
				isDir:   false,
				sys:     nil,
			})

  optional string name = 1;

  // Expression represents the expression which will be evaluated by CEL. Must evaluate to bool.
  // CEL expressions have access to the contents of the AdmissionRequest and Authorizer, organized into CEL variables:
  //
  // 'object' - The object from the incoming request. The value is null for DELETE requests.
  // 'oldObject' - The existing object. The value is null for CREATE requests.