Book Description

The Complete Guide to Avoiding and Fixing Common Rails 3 Code and Design Problems

As developers worldwide have adopted the powerful Ruby on Rails web framework, many have fallen victim to common mistakes that reduce code quality, performance, reliability, stability, scalability, and maintainability. Rails™ AntiPatterns identifies these widespread Rails code and design problems, explains why they’re bad and why they happen—and shows exactly what to do instead.

The book is organized into concise, modular chapters—each outlines a single common AntiPattern and offers detailed, cookbook-style code solutions that were previously difficult or impossible to find. Leading Rails developers Chad Pytel and Tammer Saleh also offer specific guidance for refactoring existing bad code or design to reflect sound object-oriented principles and established Rails best practices. With their help, developers, architects, and testers can dramatically improve new and existing applications, avoid future problems, and establish superior Rails coding standards throughout their organizations.

This book will help you understand, avoid, and solve problems with

• Model layer code, from general object-oriented programming violations to complex SQL and excessive redundancy
• Domain modeling, including schema and database issues such as normalization and serialization Download Now »

Book Description

Ruby on Rails strips complexity from the development process, enabling professional developers to focus on what matters most: delivering business value via clean and maintainable code. The Rails™ 3 Way is the only comprehensive, authoritative guide to delivering production-quality code with Rails 3. Pioneering Rails expert Obie Fernandez and a team of leading experts illuminate the entire Rails 3 API, along with the idioms, design approaches, and libraries that make developing applications with Rails so powerful. Drawing on their unsurpassed experience and track record, they address  the real challenges development teams face, showing how to use Rails 3 to maximize your productivity.

Using numerous detailed code examples, the author systematically covers Rails 3 key capabilities and subsystems, making this book a reference that you will turn to again and again. He presents advanced Rails programming techniques that have been proven effective in day-to-day usage on dozens of production Rails systems and offers important insights into behavior-driven development and production considerations such as scalability. Dive deep into the Rails 3 codebase and discover why Rails is designed the way it is—and how to make it do what you want it to do.

This book will help you

• Learn what’s new in Rails 3
• Increase your productivity as a web application developer Download Now »

Book Description

In today’s world of desktop applications there is a great amount of incentive to be able to develop applications that can run in more than one environment. Currently there are a handful of options available for cross platform frameworks to develop desktop applications in Python. wxPython is one such cross- platform GUI toolkit for the Python programming language. It allows Python programmers to create programs with a complete, highly functional graphical user interface, simply and easily. wxPython code style has changed quite a bit over the years, and gotten much more Pythonic. The examples you will find in this book are right up to date and reflect this change in style.

This cookbook provides you with the latest recipes to quickly create robust, reliable, and reusable wxPython applications. These recipes will guide you from writing simple, basic wxPython scripts all the way through complex concepts, and also feature various design approaches and techniques in wxPython.

The book starts off by covering a variety of topics from the most basic requirements of a wxPython application to some of the more in depth details of the inner workings of the framework laying the foundation for any wxPython application. It then explains event handling, basic and advanced user interface controls, designing and layout, creating dialogs, components and extending functionality, and so on. We conclude by learning how to build and manage applications for distribution.

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Book Description

This book gives you everything you need to know about network programming using Python 3, the latest version of the Python language. It will benefit both scripters and serious application developers who want a feature-rich, yet simple language. Fully updated, this second edition includes all the new developments in network programming such as WSGI, FastCGI, and asynchronous communication.

Foundations of Python 3 Network Programming, Second Edition explains multitasking network servers using several models, including forking, threading, and non-blocking sockets. Extensive examples throughout the book demonstrate important concepts and practices, and provide a cadre of fully-functioning stand alone programs. Readers may even use the examples included as building blocks to create their own software.

What you’ll learn

• Understand low level networking
• Handle sending and receiving email including composing and decoding emails, SMTP, POP and IMAP
• Program the lower levels of web application programming such as FastCGI and WSGI
• Script file transfer and backups
• Access web services using Python Download Now »

Book Description

Python is a great object-oriented and interactive programming language that lets you develop graphics, both static and animated, using built-in vector graphics functions that are provided with Python.

Python 2.6 Graphics Cookbook is a collection of straightforward recipes and illustrative screenshots for creating and animating graphic objects using the Python language. This book makes the process of developing graphics interesting and entertaining by working in a graphic workspace without the burden of mastering complicated language definitions and opaque examples.

If you choose to work through all the recipes from the beginning, you will learn to install Python and create basic programs for making lines and shapes using the built-in Tkinter module. The confusing topic of color manipulation is explored in detail using existing Python tools as well as some new tools in the recipes. Next you will learn to manipulate font size, color, and placement of text as placing text exactly where you want on a screen can be tricky because font height, inter-character spacing, and text window dimensions all interfere with each other. Then you will learn how to animate graphics, for example having more than one independent graphic object co-exist and interact using various Python methods.

You will also learn how you can work with raster images, such as converting their formats using the Python Imaging Library. Next you will learn how you can combine vector images with raster images so that you can animate the raster images with ease. Download Now »

Book Description

Natural Language Processing is used everywhere – in search engines, spell checkers, mobile phones, computer games – even your washing machine. Python’s Natural Language Toolkit (NTLK) suite of libraries has rapidly emerged as one of the most efficient tools for Natural Language Processing. You want to employ nothing less than the best techniques in Natural Language Processing – and this book is your answer.

Python Text Processing with NTLK 2.0 Cookbook is your handy and illustrative guide, which will walk you through all the Natural Language Processing techniques in a step-by-step manner. It will demystify the advanced features of text analysis and text mining using the comprehensive NTLK suite.

This book cuts short the preamble and you dive right into the science of text processing with a practical hands-on approach.

Get started off with learning tokenization of text. Get an overview of WordNet and how to use it. Learn the basics as well as advanced features of Stemming and Lemmatization. Discover various ways to replace words with simpler and more common (read: more searched) variants. Create your own corpora and learn to create custom corpus readers for JSON files as well as for data stored in MongoDB. Use and manipulate POS taggers. Transform and normalize parsed chunks to produce a canonical form without changing their meaning. Dig into feature extraction and text classification. Learn how to easily handle huge amounts of data without any loss in efficiency or speed. Download Now »