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Rhodes

Goerzen

Shelve in

Programming Languages/General

User level:

Intermediate–Advanced

www.apress.com

SOURCE CODE ONLINE

BOOKS FOR PROFESSIONALS BY PROFESSIONALS

Foundations of Python Network

Programming

Foundations of Python Network Programming, Third Edition, covers all of the classic

topics found in the second edition of this book, including network protocols,

network data and errors, email, server architecture, and HTTP and web applications,

plus updates for Python 3.

Some of the new topics in this edition include:

• Extensive coverage of the updated SSL support in Python 3

• How to write your own asynchronous I/O loop

• An overview of the “asyncio” framework that comes with Python 3.4

• How the Flask web framework connects URLs to your Python code

• How cross-site scripting and cross-site request forgery can be used to

attack your web site, and how to protect against them

• How a full-stack web framework like Django can automate the round trip

from your database to the screen and back

• Updated coverage of network protocol layers and data encodings

If you’re a Python programmer who needs a deep understanding of how to use

Python for network-related tasks and applications, this is the book for you. From

web application developers, to systems integrators, to system administrators—

this book has everything that you need to know.

THIRD

EDITION

9781430 258544

54999

ISBN 978-1-4302-5854-4

www.1024ebook.com

Contents at a Glance

About the Authors �� xvii

About the Technical Reviewers �� xix

Acknowledgments �� xxi

Introduction �� xxiii

Chapter 1: Introduction to Client-Server Networking ■ ��1

Chapter 2: UDP ■ ��17

Chapter 3: TCP ■ ��39

Chapter 4: Socket Names and DNS ■ ��57

Chapter 5: Network Data and Network Errors ■ ��75

Chapter 6: TLS/SSL ■ ��93

Chapter 7: Server Architecture ■ ��115

Chapter 8: Caches and Message Queues ■ ��137

Chapter 9: HTTP Clients ■ ��151

Chapter 10: HTTP Servers ■ ��169

Chapter 11: The World Wide Web ■ ��183

Chapter 12: Building and Parsing E-Mail ■ ��223

Chapter 13: SMTP ■ ��241

Chapter 14: POP ■ ��259

Chapter 15: IMAP ■ ��267

www.1024ebook.com

xxiii

Introduction

It is an exciting moment for the Python community. After two decades of careful innovation that saw the language

gain features such as context managers, generators, and comprehensions in a careful balance with its focus on

remaining simple in both its syntax and its concepts, Python is nally taking o.

Instead of being seen as a boutique language that can be risked only by top-notch programming shops such

as Google and NASA, Python is now experiencing rapid adoption, both in traditional programming roles, such as

web application design, and in the vast world of “reluctant programmers,” such as scientists, data specialists, and

engineers—people who learn to program not for its own sake but because they must write programs if they are to

make progress in their eld. e benets that a simple programming language oers for the occasional or nonexpert

programmer cannot, I think, be overstated.

Python 3

After its debut in 2008, Python 3 went through a couple of years of reworking and streamlining before it was ready

to step into the role of its predecessor. But as it now enters its second half-decade, it has emerged as the preferred

platform for innovation in the Python community.

Whether one looks at fundamental improvements, like the fact that true Unicode text is now the default string

type in Python 3, or at individual improvements, like correct support for SSL, a built-in asyncio framework for

asynchronous programming, and tweaks to Standard Library modules large and small, the platform that Python 3

oers the network programmer is in nearly every way improved. is is a signicant achievement. Python 2 was

already one of the best languages for making programmers quickly and eectively productive on the modern Internet.

is book is not a comprehensive guide to switching from Python 2 to Python 3. It will not tell you how to add

parentheses to your old print statements, rename Standard Library module imports to their new names, or debug

deeply awed network code that relied on Python 2’s dangerous automatic conversion between byte strings and

Unicode strings—conversions that were always based on rough guesswork. ere are already excellent resources to

help you with that transition or even to help you write libraries carefully enough so that their code will work under

both Python 2 and Python 3, in case you need to support both audiences.

Instead, this book focuses on network programming, using Python 3 for every example script and snippet of code at

the Python prompt. ese examples are intended to build a comprehensive picture of how network clients, network servers,

and network tools can best be constructed from the tools provided by the language. Readers can study the transition from

Python 2 to Python 3 by comparing the scripts used in each chapter of the second edition of this book with the listings here

in the third edition—both of which are available at https://github.com/brandon-rhodes/fopnp/tree/m/ thanks to the

excellent Apress policy of making source code available online. e goal in each of the following chapters is simply to show

you how Python 3 can best be used to solve modern network programming problems.

By focusing squarely on how to accomplish things the right way with Python 3, this book hopes to prepare both

the programmer who is getting ready to write a new application from the ground up and the programmer preparing

to transition an old code base to the new conventions. Both programmers should come away knowing what correct

networking code looks like in Python 3 and therefore knowing the look and avor of the kind of code that ought to be

their goal.

www.1024ebook.com

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