Flask实战教程：Python构建个性化Web应用

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"Flask网页编程教程是一本由Italo Maia编写的实用指南，它旨在帮助读者利用Python和Flask构建能满足个人需求的惊人网络应用。这本书《Building Web Applications with Flask》是针对Flask框架的深入学习材料，适合于那些希望在Web开发领域施展才华的开发者。该教程详细介绍了如何使用Flask，一个轻量级的Web应用框架，其设计初衷是提供一种简洁的方式来构建现代Web服务。在本书中，作者不仅传授了基础概念，如设置开发环境、路由、模板引擎、数据库集成等，还涵盖了高级主题，例如安全、调试、部署以及与RESTful API的交互。通过丰富的代码示例和实战项目，读者可以快速掌握Flask的核心功能，并逐步提升自己的Web开发技能。值得注意的是，版权方面，这本书受到严格保护，未经Packt Publishing事先书面许可，不得复制、存储或通过任何形式或媒介进行传播。尽管作者和出版商尽力确保信息的准确性，但本书提供的内容不带有任何保证，无论是明示的还是暗示的，对于因使用本书内容导致的直接或间接损失，作者和Packt Publishing及其经销商概不负责。在商标使用上，Packt Publishing已尽其所能正确标注书中提及的所有公司和产品的商标信息，但并不能保证其准确性。总体而言，《Building Web Applications with Flask》是一本为Flask初学者和进阶者精心打造的实用教材，是深入理解并实践Web开发的宝贵资源。"

[ v ]

Preface

One can hardly develop new applications in our "now world" without duct-taping

a lot of technologies together, be it new trend databases, messaging systems, or

languages of all kinds. When talking about web development, things might get

slightly more complicated as not only do you have to mix a lot of technologies

together, but they must also work well with the applications accessing them (also

known as web browsers). They should also be compatible with your deployment

server, which is another story in itself!

In the Python world, where people deliver amazing desktop software following

great guidelines such as the Zen of Python and PEP8, we have, at our disposal, a

wide range of libraries and frameworks for creating great web applications, each

with its own philosophy. Django, for example, is a bundle solution; it makes choices

for you on how your project should look, what should it have, and how things

should be done. Web2py is another framework solution that goes beyond and

bundles even the IDE with it. These are great concepts, but if you want to create

something simple, I would suggest you to do it somewhere else. They're usually

good choices, but sometimes they're just too much (the latest Django version seems

decisive in changing that; let's keep an eye on further developments).

Flask positions itself, not as a full-power out-of-the-box solution like both Django

and Web2py, but as a minimalistic solution where you're given the bare minimum to

work with and choose all the other stuff. That's very helpful when you want granular

control of your application, when you want to precisely pick your components, or

when your solution is simple (not simplistic, okay?).

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Preface

[ vi ]

This book is a response to that scenario of beautiful code and many options in the

Web world. It tries to walk through the main concerns regarding web development,

from security to content delivery and from session management to REST services

and CRUD. Important modern concepts such as overengineering, quality and the

development process are covered, so as to achieve better results from day one. To

make the learning process smooth, subjects are presented without rush and followed

by commented examples. The book also sets out to give readers real-world advice on

how to prevent common problems with code.

Come learn how to create great Flask applications, delivering value to your projects

and customers!

What this book covers

Chapter 1, Flask in a Flask, I Mean, Book, introduces you to Flask, explaining what it is,

what it is not, and how it positions itself in the web framework world.

Chapter 2, First App, How Hard Could it Be?, covers the very rst step toward Flask

development, including environment setup, your very own "Hello World" app, and

how templates enter into this equation. A uffy chapter it is!

Chapter 3, Man, Do I Like Templates!, deals with face tags and lters progresses

through the Jinja2 template engine and how it integrates with Flask. Things start to

get a little serious from here!

Chapter 4, Please Fill in This Form, Madam, discusses how to handle forms (as forms

are a fact in the web development life) with all the care they need using WTForms in

all its glory!

Chapter 5, Where Do You Store Your Stuff?, introduces you to the concepts of relational

and non-relational databases, covering how to handle both cases, and also when to.

Chapter 6, But I Wanna REST Mom, Now!, is a chapter on creating REST services (as

the REST hype must be satised), manually and using the amazing Flask-Restless.

Chapter 7, If Ain't Tested, It Ain't Game, Bro!, is our quality-centric chapter where you

learn to deliver quality through proper testing, the TDD and BDD way!

Chapter 8, Tips and Tricks or Flask Wizardry 101, is a dense chapter covering good

practices, architecture, blueprints, debugging, and session management.

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Preface

[ vii ]

Chapter 9, Extensions, How I Love Thee, covers all those great Flask extensions not

covered so far that will help you achieve the productivity the real world requires

from you.

Chapter 10, What Now?, ends our development trip covering all the basics for a

healthy deployment, and points you toward your next steps in the Flask world.

What you need for this book

To make the most of your reading experience, the reader is expected to have a

machine with Ubuntu 14.x or superior installed as the examples are designed

for this setup, a basic knowledge of Python (if you don't have this, refer to

http://learnxinyminutes.com/docs/python/ rst), and a text editor with

highlights of your likings (LightTable, Sublime, Atom). Other required software will

be discussed through the chapters.

Who this book is for

This book targets Python developers, with some or no experience with web

development, who wish to create minimalistic web applications. It is focused on

those who want to become web developers as all the basics are covered to some

extent, and also on those who already are familiar with web development using

other frameworks, be it Python-based frameworks such as Django, Bottle, or

Pyramid, or frameworks from other languages.

It is also important that you have a basic understanding of web technologies used to

construct web pages, as is the case for CSS, JavaScript, and HTML. If that is not your

background, please check out the W3Schools website (http://w3schools.com/)

as it covers the basics of using these technologies. Also, if you're skilled with the

Linux terminal, your life will be much easier throughout the whole book; try the link

https://help.ubuntu.com/community/UsingTheTerminal if this is not the case.

Nonetheless, be assured that, if you have a basic knowledge of Python, you're more

than capable of understanding the examples and the chapters; at the end of the

book, you will be creating amazing web applications that perform well and are

easy to maintain.

Conventions

In this book, you will nd a number of styles of text that distinguish between

different kinds of information. Here are some examples of these styles, and an

explanation of their meaning.

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Flask实战教程：Python构建个性化Web应用

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