# Eventos de Lifespan { #lifespan-events }

Puedes definir lógica (código) que debería ser ejecutada antes de que la aplicación **inicie**. Esto significa que este código será ejecutado **una vez**, **antes** de que la aplicación **comience a recibir requests**.

```

这是因为上传文件是以「表单数据」发送的。

///

## 导入 `File` { #import-file }

从 `fastapi` 导入 `File` 和 `UploadFile`：

{* ../../docs_src/request_files/tutorial001_an_py310.py hl[3] *}

## 定义 `File` 参数 { #define-file-parameters }

像为 `Body` 或 `Form` 一样创建文件参数：

{* ../../docs_src/request_files/tutorial001_an_py310.py hl[9] *}

/// info | 信息

`File` 是直接继承自 `Form` 的类。

        // Node / Browserify
        //isomorphic issue
        var jQuery = (typeof window != 'undefined') ? window.jQuery : undefined;
        if (!jQuery) {
            jQuery = require('jquery');
            if (!jQuery.fn) jQuery.fn = {};
        }
        var moment = (typeof window != 'undefined' && typeof window.moment != 'undefined') ? window.moment : require('moment');
        module.exports = factory(moment, jQuery);
    } else {

                .toList();

        if (!unversionedPlugins.isEmpty()) {
            logger.warn("Version not locked for default bindings plugins " + unversionedPlugins
                    + ", you should define versions in pluginManagement section of your " + "pom.xml or parent");
        }

        return executionPlan;
    }

    public void handleBuildError(
            final ReactorContext buildContext,

///

## Импорт `File` { #import-file }

Импортируйте `File` и `UploadFile` из модуля `fastapi`:

{* ../../docs_src/request_files/tutorial001_an_py310.py hl[3] *}

## Определите параметры `File` { #define-file-parameters }

Создайте параметры `File` так же, как вы это делаете для `Body` или `Form`:

{* ../../docs_src/request_files/tutorial001_an_py310.py hl[9] *}

/// info | Дополнительная информация

 * This class provides common functionality for job execution including process management,
 * logging configuration, JVM options, and timeout handling.
 *
 * <p>Subclasses must implement the abstract methods to define specific job behavior
 * and execution type identification.</p>
 *
 * @version 1.0
 */
public abstract class ExecJob {

    /** Logger instance for this class */

errors.app.double.submit.request = Esta solicitação pode já ter sido processada. Por favor, tente novamente.
# _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
# you can define your messages here:
# e.g.
# errors.xxx = ...
# info.xxx = ...
# _/_/_/_/_/_/_/_/_/_/
# ========================================================================================
# Fess
# ======

        }
    }

    @Nested
    @DisplayName("Constants Tests")
    class ConstantsTests {

        @Test
        @DisplayName("Should define correct ACB (Account Control Block) constants")
        void testACBConstants() {
            // Verify all ACB constants
            assertEquals(1, samr.ACB_DISABLED);
            assertEquals(2, samr.ACB_HOMDIRREQ);

      When doing so, still annotate nullable parameters and the return type as `@Nullable`.
  * Do not use `@Contract` for public APIs.
  * For polynull public APIs, the solution has to be decided on a case-by-case basis.

Do not remove `null` checks on public API boundaries, even if the annotations (or rather lack of them) suggest this.
Not all client code is compiled with NullAway.

{* ../../docs_src/pydantic_v1_in_v2/tutorial003_an_py310.py hl[2:3,6,12,21:22] *}

En el ejemplo anterior, el modelo de entrada es un modelo de Pydantic v1 y el modelo de salida (definido en `response_model=ItemV2`) es un modelo de Pydantic v2.

### Parámetros de Pydantic v1 { #pydantic-v1-parameters }