在這個範例中因為是存在記憶體的假檔案（`io.BytesIO`），影響不大；但若是實際檔案，務必在處理完成後關閉檔案。

### 檔案與 Async { #files-and-async }

多數情況下，類檔案物件預設不相容於 async/await。

例如，它們沒有 `await file.read()`，也不支援 `async for chunk in file`。

而且在許多情況下，讀取它們會是阻塞操作（可能阻塞事件迴圈），因為資料是從磁碟或網路讀取。

/// info

上面的範例其實是例外，因為 `io.BytesIO` 物件已在記憶體中，讀取不會阻塞任何東西。

但在多數情況下，讀取檔案或類檔案物件會造成阻塞。

///

在这个特定示例中这并不那么重要，因为它是一个内存中的假文件（使用 `io.BytesIO`），但对于真实文件，确保在完成相关工作后关闭文件是很重要的。

### 文件与异步 { #files-and-async }

大多数情况下，类文件对象默认与 async 和 await 不兼容。

例如，它们没有 `await file.read()`，也不支持 `async for chunk in file`。

而且很多情况下，读取它们是一个阻塞操作（可能会阻塞事件循环），因为数据来自磁盘或网络。

/// info | 信息

上面的示例其实是个例外，因为 `io.BytesIO` 对象已经在内存中，所以读取它不会阻塞。

但在许多情况下，读取文件或类文件对象会发生阻塞。

///

	// the file it points to has been changed we will use the updated symlink.
	argv0, err := exec.LookPath(os.Args[0])
	if err != nil {
		return err
	}

	// Invokes the execve system call.
	// Re-uses the same pid. This preserves the pid over multiple server-respawns.
	return syscall.Exec(argv0, os.Args, os.Environ())
}

// freezeServices will freeze all incoming S3 API calls.

// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful

d. If the Work includes a "NOTICE" text file as part of its distribution, 
then any Derivative Works that You distribute must include a readable copy 
of the attribution notices contained within such NOTICE file, excluding 
those notices that do not pertain to any part of the Derivative Works, in at 
least one of the following places: within a NOTICE text file distributed as 

// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

TEXT foo(SB), 0, $0
	RET
TEXT foo(SB), 0, $0 // ERROR "symbol foo redeclared"
	RET

GLOBL bar(SB), 0, $8
GLOBL bar(SB), 0, $8 // ERROR "symbol bar redeclared"

DATA bar+0(SB)/8, $0

### El archivo de configuración { #the-config-file }

Proveniente del ejemplo anterior, tu archivo `config.py` podría verse como:

{* ../../docs_src/settings/app02_an_py310/config.py hl[10] *}

Nota que ahora no creamos un instance por defecto `settings = Settings()`.

### El archivo principal de la app { #the-main-app-file }

Ahora creamos una dependencia que devuelve un nuevo `config.Settings()`.

                                                <div class="mb-2 mr-sm-2"><input type="file" id="bulkFile"
                                                                                 name="bulkFile"
                                                                                 class="form-control-file"/></div>
                                                <button type="submit" class="btn btn-success mb-2" name="upload">

/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.gradle.internal.release;

import org.gradle.process.ExecOperations;

for the kubelet in the dropin, a structured configuration file for the kubelet is used, and is expected to be present in `/var/lib/kubelet/config.yaml`. For runtime-detected, instance-specific configuration values, a environment file with dynamically-generated flags at `kubeadm init` or `kubeadm join` run time is used. Finally, if you want to override something specific for the kubelet that can't be done via the kubeadm Configuration file (which is preferred), you might add flags to the `KUBELET_EXTRA_ARGS`...