def get_settings():
    return Settings()
```

我们将为每个请求创建该对象，并且将在每个请求中读取 `.env` 文件。 ⚠️

但是，由于我们在顶部使用了 `@lru_cache` 装饰器，因此只有在第一次调用它时，才会创建 `Settings` 对象一次。 ✔️

{* ../../docs_src/settings/app03_an_py39/main.py hl[1,11] *}

然后，在下一次请求的依赖项中对 `get_settings()` 进行任何后续调用时，它不会执行 `get_settings()` 的内部代码并创建新的 `Settings` 对象，而是返回在第一次调用时返回的相同对象，一次又一次。

#### `lru_cache` 技术细节

`@lru_cache` 修改了它所装饰的函数，以返回第一次返回的相同值，而不是再次计算它，每次都执行函数的代码。

Now, let's include the `router`s from the submodules `users` and `items`:

{* ../../docs_src/bigger_applications/app_an_py39/main.py hl[10:11] title["app/main.py"] *}

/// info

`users.router` contains the `APIRouter` inside of the file `app/routers/users.py`.

And `items.router` contains the `APIRouter` inside of the file `app/routers/items.py`.

Inkludieren wir nun die `router` aus diesen Submodulen `users` und `items`:

{* ../../docs_src/bigger_applications/app_an_py39/main.py hl[10:11] title["app/main.py"] *}

/// info | Info

`users.router` enthält den `APIRouter` in der Datei `app/routers/users.py`.

Und `items.router` enthält den `APIRouter` in der Datei `app/routers/items.py`.

///

Давайте подключим маршрутизаторы (`router`) из суб-модулей `users` и `items`:

{* ../../docs_src/bigger_applications/app_an_py39/main.py hl[10:11] title["app/main.py"] *}

/// info | Примечание

`users.router` содержит `APIRouter` из файла `app/routers/users.py`.

А `items.router` содержит `APIRouter` из файла `app/routers/items.py`.

///

  }

  private fun upgradeResponse(request: RecordedRequest): MockResponse.Builder {
    val key = request.headers["Sec-WebSocket-Key"]
    return MockResponse
      .Builder()
      .status("HTTP/1.1 101 Switching Protocols")
      .setHeader("Connection", "Upgrade")
      .setHeader("Upgrade", "websocket")
      .setHeader("Sec-WebSocket-Accept", acceptHeader(key!!))
  }

			ListMultipartsInfo{KeyMarker: "europe-object", Prefix: "Asia", IsTruncated: false},
			nil, true,
		},
		// Setting an invalid combination of uploadIDMarker and Marker (Test number 11-12).
		{
			bucketNames[0], "asia", "asia/europe/", "abc", "", 0,
			ListMultipartsInfo{},
			fmt.Errorf("Invalid combination of uploadID marker '%s' and marker '%s'", "abc", "asia/europe/"), false,
		},
		{

    // 1 << 31 is negative because of overflow, 1 << 31 - 1 is positive
    // since isEvenLevel adds 1, we need to do - 2.
    assertTrue(MinMaxPriorityQueue.isEvenLevel((1 << 31) - 2));
    assertTrue(MinMaxPriorityQueue.isEvenLevel(Integer.MAX_VALUE - 1));
    assertThrows(IllegalStateException.class, () -> MinMaxPriorityQueue.isEvenLevel((1 << 31) - 1));
    assertThrows(

```Python hl_lines="5" title="app/main.py"
{!../../docs_src/bigger_applications/app/main.py!}
```

### 包含 `users` 和 `items` 的 `APIRouter`

现在，让我们来包含来自 `users` 和 `items` 子模块的 `router`。

```Python hl_lines="10-11" title="app/main.py"
{!../../docs_src/bigger_applications/app/main.py!}
```

/// info

`users.router` 包含了 `app/routers/users.py` 文件中的 `APIRouter`。

			</plugin>
			<plugin>
				<artifactId>maven-antrun-plugin</artifactId>
				<dependencies>
					<dependency>
						<groupId>org.apache.ant</groupId>
						<artifactId>ant</artifactId>
						<version>1.10.11</version>
					</dependency>
				</dependencies>
				<configuration>
					<target>
						<ant antfile="${basedir}/dbflute.xml" target="download.dbflute" />

				6:  {vDelMarker, vObj}, // disk 6
				7:  {vDelMarker, vObj}, // disk 7
				8:  {vDelMarker, vObj}, // disk 8
				9:  {vDelMarker, vObj}, // disk 9
				10: {vObj},             // disk 10
				11: {vDelMarker, vObj}, // disk 11
				12: {vDelMarker, vObj}, // disk 12
				13: {vDelMarker, vObj}, // disk 13
				14: {vDelMarker, vObj}, // disk 14
				15: {vDelMarker, vObj}, // disk 15
			},
			quorum:      7,