Pruning is activated by setting `spec.preserveUnknownFields: false` in the CustomResourceDefinition. A future apiextensions.k8s.io/v1 variant of CRDs will enforce pruning.

```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：

* Update docs for testing FastAPI. Include using `POST`, sending JSON, testing headers, etc. New documentation: [Testing](https://fastapi.tiangolo.com/tutorial/testing/#testing-extended-example). PR [#271](https://github.com/tiangolo/fastapi/pull/271).

project(":mockwebserver-junit4").name = "mockwebserver3-junit4"
include(":mockwebserver-junit5")
project(":mockwebserver-junit5").name = "mockwebserver3-junit5"

val androidBuild: String by settings
val graalBuild: String by settings
val loomBuild: String by settings

if (androidBuild.toBoolean()) {
  include(":regression-test")
}

if (graalBuild.toBoolean()) {
  include(":native-image-tests")
}

include(":okcurl")

  // server will set the `continue` field on the list metadata to a value that can be used with the
  // same initial query to retrieve the next set of results. Setting a limit may return fewer than
  // the requested amount of items (up to zero items) in the event all requested objects are
  // filtered out and clients should only use the presence of the continue field to determine whether

### 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>

                actual dependency that should be called.

                This is for testing, to replace expensive dependencies with testing
                versions.

                Read more about it in the
                [FastAPI docs for Testing Dependencies with Overrides](https://fastapi.tiangolo.com/advanced/testing-dependencies/).
                """
            ),
        ] = {}

plugins {
    id("com.gradle.develocity").version("3.18.1") // Run `java build-logic-settings/UpdateDevelocityPluginVersion.java <new-version>` to update
    id("io.github.gradle.gradle-enterprise-conventions-plugin").version("0.10.2")
    id("org.gradle.toolchains.foojay-resolver-convention").version("0.8.0")
}

include("build-environment")

<?xml version="1.0" encoding="UTF-8"?>
<settings>
  <webhooks enabled="true">
    <webhook url="https://gradle-bot.grdev.net/teamcity_slacktemplate" enabled="true" template="slack.com">
      <states>
        <state type="buildAddedToQueue" enabled="false" />
        <state type="buildRemovedFromQueue" enabled="true" />
        <state type="buildStarted" enabled="true" />
        <state type="changesLoaded" enabled="true" />