///

## Upload de Arquivo Opcional { #optional-file-upload }

Você pode tornar um arquivo opcional usando anotações de tipo padrão e definindo um valor padrão de `None`:

{* ../../docs_src/request_files/tutorial001_02_an_py310.py hl[9,17] *}

## `UploadFile` com Metadados Adicionais { #uploadfile-with-additional-metadata }

import java.util.concurrent.TimeoutException;
import org.jspecify.annotations.Nullable;

/**
 * An executor service which forwards all its method calls to another executor service. Subclasses
 * should override one or more methods to modify the behavior of the backing executor service as
 * desired per the <a href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
 *

    private static final java.util.concurrent.atomic.AtomicInteger queueSize = new java.util.concurrent.atomic.AtomicInteger(0);

    /**
     * Gets a buffer from the cache or creates a new one if the cache is empty.
     *
     * Performance: O(1) operation using concurrent queue
     *
     * @return a byte buffer for SMB operations
     * @throws IllegalStateException if buffer size exceeds maximum allowed

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *

      return;
    }
    fail("Should get equal to incompatible class error");
  }

  /** Test proper handling where an object is not equal to one the user has said should be equal */
  public void testInvalidNotEqualsEqualObject() {
    equalsTester.addEqualityGroup(reference, notEqualObject1);
    try {
      equalsTester.testEquals();

All the framework was designed to be easy and intuitive to use, all the decisions were tested on multiple editors even before starting development, to ensure the best development experience.

In the Python developer surveys, it's clear [that one of the most used features is "autocompletion"](https://www.jetbrains.com/research/python-developers-survey-2017/#tools-and-features).

The whole **FastAPI** framework is based to satisfy that. Autocompletion works everywhere.

        tasks.named("test", Test.class).configure(task -> {
            task.getInputs().file(extension.getReleaseNotes().getRenderedDocumentation()).withPropertyName("releaseNotes").withPathSensitivity(PathSensitivity.NONE);

            task.getInputs().property("systemProperties", Collections.emptyMap());
            // TODO: This breaks the provider

{* ../../docs_src/path_params_numeric_validations/tutorial001_an_py310.py hl[10] *}

/// note | Примечание

Path-параметр всегда является обязательным, поскольку он должен быть частью пути. Даже если вы объявите его как `None` или зададите значение по умолчанию, это ни на что не повлияет — параметр всё равно будет обязательным.

///

## Задайте нужный вам порядок параметров { #order-the-parameters-as-you-need }

/// tip | Подсказка

Но если вы указали пользовательский класс ответа с `None` в качестве его типа содержимого, FastAPI использует `application/json` для любого дополнительного ответа, у которого есть связанная модель.

///

## Комбинирование информации { #combining-information }