Python3入门：打造与部署Web应用全攻略

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"Python3 Web Development Beginner's Guide" 是一本面向Python 3初学者的指南，专为那些对网络Web开发感兴趣的人设计。作者Michel Anders以其在BIRMINGHAM-MUMBAI的背景，带领读者通过Python语言构建独特的Web应用。这本书是2011年首次出版，版权属于Packt Publishing，强调所有内容未经许可不得复制、存储或传播。在本书中，读者可以系统地学习如何利用Python 3进行Web开发的基础知识，包括但不限于网页服务器的搭建、Python Web框架（如Django或Flask）的使用、HTTP协议的理解、数据处理与数据库交互、前端技术如HTML、CSS和JavaScript的配合，以及部署Web应用到生产环境的过程。作者会确保提供准确的信息，但需要明确的是，书中提供的内容并非保证无误，且不承担因使用本书信息导致的直接或间接损失的责任。此外，由于版权法的规定，Packt Publishing在提及书中涉及的所有公司和产品时尽可能使用了正确的商标标识，但并不能确保这些信息的绝对准确性。这是一本旨在帮助新手快速入门Python 3 Web开发，并通过实践项目提升技能的实用教材，适合想要踏入这个领域的学习者。

Preface

Building your own Python web applicaons provides you with the opportunity to have great

funconality, with no restricons. However, creang web applicaons with Python is not

straighorward. Coupled with learning a new skill of developing web applicaons, you would

normally have to learn how to work with a framework as well.

Python 3 Web Development Beginner's Guide shows you how to independently build your

own web applicaon that is easy to use, performs smoothly, and is themed to your taste—all

without having to learn another web framework.

Web development can take me and is oen ddly to get right. This book will show you

how to design and implement a complex program from start to nish. Each chapter looks

at a dierent type of web applicaon, meaning that you will learn about a wide variety

of features and how to add them to your customized web applicaon. You will also learn

to implement jQuery into your web applicaon to give it extra funconality. By using the

right combinaon of a wide range of tools, you can have a fully funconal, complex web

applicaon up and running in no me.

A praccal guide to building and customizing your own Python web applicaon, without the

restricon of a pre-dened framework.

What this book covers

Chapter 1, Choosing Your Tools, looks at the many aspects of designing web applicaons.

The idea is to provide you with an overview that may help you recognize components in

subsequent chapters and give you some insight into the arguments used to decide which

tool or library to use. We also illustrate some issues that are relevant when designing an

applicaon that does not deal with coding directly, such as security or usability.

Chapter 2, Creang a Simple Spreadsheet, develops a simple spreadsheet applicaon. The

spreadsheet funconality will be enrely implemented in JavaScript plus jQuery UI, but

on the server-side, we will encounter the applicaon server, CherryPy, for the rst me

and we will extend it with Python code to deliver the page that contains the spreadsheet

applicaon dynamically.

Preface

[ 2 ]

Chapter 3, Tasklist I: Persistence, a full edged web applicaon needs funconality to store

informaon on the server and a way to idenfy dierent users. In this chapter, we address

both issues as we develop a simple applicaon to maintain lists of tasks.

Chapter 4, Tasklist II: Databases and AJAX, refactors the tasklist applicaon developed in

the previous chapter. We will use the SQLite database engine on the server to store items

and will use jQuery's AJAX funconality to dynamically update the contents of the web

applicaon. On the presentaon side, we will encounter jQuery UI's event system and will

learn how to react on mouse clicks.

Chapter 5, Enes and Relaons, most real life applicaons sport more than one enty and

oen many of these enes are related. Modeling these relaons is one of the strong points

of a relaonal database. In this chapter, we will develop a simple framework to manage

these enes and use this framework to build an applicaon to maintain lists of books for

mulple users.

Chapter 6, Building a Wiki, develops a wiki applicaon and in doing so we focus on two

important concepts in building web applicaons. The rst one is the design of the data layer.

The wiki applicaon is quite complex, and in this chapter, we try to see where the limitaons

in our simple framework lie. The second one is input validaon. Any applicaon that accepts

input from all over the Internet should check the data it receives, and in this chapter, we look

at both client-side and server-side input validaon.

Chapter 7, Refactoring Code for Reuse, aer doing a substanal bit of work, it is oen a good

idea to take a step back and look crically at your own work to see if things could have been

done beer. In this chapter, we look at ways to make the enty framework more generally

useful and employ it to implement the books applicaon a second me.

Chapter 8, Managing Customer Relaons, there is more to an enty framework and CherryPy

applicaon code than merely browsing lists. The user must be able to add new instances and

edit exisng ones. This chapter is the start of the development of a CRM applicaon that will

be extended and rened in the nal chapters.

Chapter 9, Creang Full-Fledged Webapps: Implemenng Instances, focuses on the design

and implementaon of the user interface components to add and maintain enes,

and relaons between enes, in a way that is independent of the type of enty. This

funconality is immediately put to use in the CRM applicaon that we develop. Managing

user privileges is another issue we encounter as we explore the concept of role-based access

control.

Chapter 10, Customizing the CRM Applicaon, is the nal chapter and it extends our

framework and thereby our CRM applicaon by taking a look at browsing, ltering,

and sorng large numbers of enes. We also take a look at what is needed to allow

customizaon by the end user of the applicaon's appearance and its funconality.

Preface

[ 3 ]

Appendix A, References to Resources, is a convenient overview of both Web and paper

resources.

What you need for this book

Besides a computer running Windows or Linux to develop and test your applicaons, you will

need the following pieces of open source soware:

 Python 3.2

 CherryPy 3.2.0

 jQuery 1.4.4

 jQuery UI 1.8.6

How to obtain and install these packages is explained in detail in Chapter 2. We also use

some addional plugins for jQuery and provide installaon instrucons where appropriate.

You will also need a web browser to interact with your applicaons. The applicaons were

tested on Firefox 3 and Internet Explorer 8, but any moderately recent versions of these

browsers will probably work just as well, as will Chrome. The Firebug extension for Firefox,

however, is a superior tool to debug the client-side of web applicaons, so you might want to

try it if you have not done so already. Appendix A provides links to the necessary resources.

Finally, you will need a text editor, preferably with syntax highlighng capabilies for Python

as well as JavaScript and HTML. The author uses Notepad++ (

http://notepad-plus-

plus.org/

) on Windows and JOE (http://joe-editor.sourceforge.net/) on Linux,

but the choice is enrely up to you.

Who this book is for

Moderately experienced Python programmers who want to learn how to create fairly

complex, database-driven, cross browser compable web applicaons that are maintainable

and look good, will nd this book of most use. All applicaons in the book are developed

in Python 3, but experience with Python 2.x is sucient to understand all examples.

JavaScript plays an important supporng role in many of the example applicaons and some

introductory level knowledge of JavaScript might be useful, but is not strictly necessary

because the focus is mainly on Python development and the JavaScript code is used either

as building blocks or explained in such detail that anyone comfortable with Python should be

able to understand it.

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