```Python hl_lines="10"
{!../../docs_src/settings/app02/config.py!}
```

Beachten Sie, dass wir jetzt keine Standardinstanz `settings = Settings()` erstellen.

### Die Haupt-Anwendungsdatei

Jetzt erstellen wir eine Abhängigkeit, die ein neues `config.Settings()` zurückgibt.

//// tab | Python 3.9+

```Python hl_lines="6  12-13"
{!> ../../docs_src/settings/app02_an_py39/main.py!}
```

////

## ⚒ 🔗

🍾 ⚫️ 5️⃣📆 ⚠ 🚚 ⚒ ⚪️➡️ 🔗, ↩️ ✔️ 🌐 🎚 ⏮️ `settings` 👈 ⚙️ 🌐.

👉 💪 ✴️ ⚠ ⏮️ 🔬, ⚫️ 📶 ⏩ 🔐 🔗 ⏮️ 👆 👍 🛃 ⚒.

### 📁 📁

👟 ⚪️➡️ ⏮️ 🖼, 👆 `config.py` 📁 💪 👀 💖:

```Python hl_lines="10"
{!../../docs_src/settings/app02/config.py!}
```

👀 👈 🔜 👥 🚫 ✍ 🔢 👐 `settings = Settings()`.

### 👑 📱 📁

🔜 👥 ✍ 🔗 👈 📨 🆕 `config.Settings()`.

```Python hl_lines="5  11-12"

 |
 |  1. User Level. This settings.xml file provides configuration for a single user,
 |                 and is normally provided in ${user.home}/.m2/settings.xml.
 |
 |                 NOTE: This location can be overridden with the CLI option:
 |
 |                 -s /path/to/user/settings.xml
 |
 |  2. Installation Level.
 |                 This settings.xml file provides configuration for all Maven

### O arquivo principal da aplicação

Agora criamos a dependência que retorna um novo objeto `config.Settings()`.

//// tab | Python 3.9+

```Python hl_lines="6  12-13"
{!> ../../docs_src/settings/app02_an_py39/main.py!}
```

////

//// tab | Python 3.8+

```Python hl_lines="6  12-13"
{!> ../../docs_src/settings/app02_an/main.py!}
```

KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
-->

<settings>
  <pluginGroups>
    <pluginGroup>org.codehaus.tycho</pluginGroup>
    <pluginGroup>org.sonatype.pwt</pluginGroup>
  </pluginGroups>

  xml.namespace="http://maven.apache.org/SETTINGS/${version}"
  xml.schemaLocation="http://maven.apache.org/xsd/settings-${version}.xsd">
  <id>settings</id>
  <name>Settings</name>
  <description>
    <![CDATA[
    <p>This is a reference for the user-specific configuration for Maven.</p>

Bo Zhang <******@****.***> 1715586305 +0800

Yuri Schimke <******@****.***> 1713104645 +0100

## Pydantic `Settings`

Fortunately, Pydantic provides a great utility to handle these settings coming from environment variables with <a href="https://docs.pydantic.dev/latest/concepts/pydantic_settings/" class="external-link" target="_blank">Pydantic: Settings management</a>.

### Install `pydantic-settings`

```Python hl_lines="2  5-8  11"
{!../../docs_src/settings/tutorial001.py!}
```

/// tip

如果您需要一个快速的复制粘贴示例，请不要使用此示例，而应使用下面的最后一个示例。

///

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：