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Perl & LWP, by Sean M. Burke
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Perl soared to popularity as a language for creating and managing web content, but with LWP (Library for WWW in Perl), Perl is equally adept at consuming information on the Web. LWP is a suite of modules for fetching and processing web pages.The Web is a vast data source that contains everything from stock prices to movie credits, and with LWP all that data is just a few lines of code away. Anything you do on the Web, whether it's buying or selling, reading or writing, uploading or downloading, news to e-commerce, can be controlled with Perl and LWP. You can automate Web-based purchase orders as easily as you can set up a program to download MP3 files from a web site.Perl & LWP covers:
- Understanding LWP and its design
- Fetching and analyzing URLs
- Extracting information from HTML using regular expressions and tokens
- Working with the structure of HTML documents using trees
- Setting and inspecting HTTP headers and response codes
- Managing cookies
- Accessing information that requires authentication
- Extracting links
- Cooperating with proxy caches
- Writing web spiders (also known as robots) in a safe fashion
- Sales Rank: #1094032 in eBooks
- Published on: 2002-06-20
- Released on: 2009-02-09
- Format: Kindle eBook
Amazon.com Review
Perl & LWP sets out to unwrap the Library for the Web in Perl (LWP), which is a collection of modules that make it easier to access and pick apart Web pages (and FTP-accessible files, and outgoing e-mail messages) from within your Perl programs. The book succeeds wonderfully, not only in conveying the technical aspects of LWP programming, but in making clear the fun of doing work that's very well suited to Perl. Sean Burke assumes that his readers know something about Perl, albeit not much, and a similar amount about HTML. He does a great job of explaining how LWP functions fit into Perl programs, and how you can use them to make reference to Internet resources far more easily than before.
Burke's narrative takes the form of a guided tour in which he introduces his readers to aspects of the LWP modules one by one. His tone is generally straightforward (sharp commentary alternates with brief code listings, with occasional passages of reference material), but there's sometimes an undercurrent of exuberance that makes the reader want to get going with his or her own programming right away. Overall, the emphasis is on teaching both LWP and Perl itself to the extent necessary to do LWP work. Because of the concise and nicely indexed code modules, though, you'll find this book useful as a reference after you're under way with LWP. --David Wall
Topics covered: How to program with LWP and Perl itself. All of LWP's strong points--including HTML parsing (with tokens and trees as well as with regular expressions), HTML generation and modification, manipulation of HTML forms, and the operation of spiders--are covered. This book has more of a tutorial tone than any similar reference material on the Internet.
About the Author
Sean Burke is an active member in the Perl community and one of CPAN's most prolific module authors. He has been a columnist for The Perl Journal since 1998, and is an authority on markup languages. Trained as a linguist, he also develops tools for software internationalization and Native language preservation.
Most helpful customer reviews
0 of 0 people found the following review helpful.
great vendor
By Yonaguska
Excellent!
15 of 15 people found the following review helpful.
This book can teach you expert-level web scraping/munging.
By wickline
If you aren't yet comfortable using object-oriented Perl modules, the multitude of examples will at least allow you see how it's done even if you're a bit fuzzy on what's happening 'underneath' when you call object methods. If you're comfortable learning how to do something without knowing exactly why it works, then the author's clear step-by-step explantions and numerous progressively more powerful examples should make this book accessible even to relatively innexperienced Perl programmers.
More experienced programmers will understand better why things work, but any Perl programmer will set this book down feeling empowered to turn the web into their own valet. No longer do you need to check multiple sites looking for interesting information. Instead, you can readily author code to do that for you and alert you when items of interest are found. You can use these tools to free up personal time, to harvest information to inform business decisions, to automate tedious web application testing, and a zillion other things.
The author's clear exploration of the relevant Perl modules leaves the reader with a good depth of understanding of what these modules do, when you might want to use which module, and how to use them for real world tasks. Before reading the book, I knew of these modules, but they were a rather intimidating pile. I'd used a few of them on occasion for rather limited projects, but was reluctant to invest the time required to read all of the documentation from the whole collection. Mountains of method-level documentation do not a tutorial make. This book takes all of that information, selects the most important parts, and ensures that those parts are covered in progressively more powerful and/or flexible examples.
If you know Perl and you're sick of 'working the web' to get information and you want the web to work for you instead, then you need this book. I had a personal project that was on the back burner for a couple of years because it just sounded too hard. The weekend after I finished this book, I wrote what I had previously thought to be the hard part of that project and it was both easy and fun. This book makes hard things not just possible, but actually easy.
-matt
18 of 18 people found the following review helpful.
Excellent coverage of LWP, packed full of useful examples
By Gavin
I was definitely interested when I first heard that O'Reilly were publishing a book on LWP. LWP is a definitive collection of perl modules covering everything you could think of doing with URIs, HTML, and HTTP. While 'web services' are the buzzword friendly technology of the day, sometimes you need to roll your sleeves up and get a bit dirty scraping screens and hacking at HTML. For such a deep subject, this book weighs in at a slim 242 pages. This is a very good thing. I'm far too busy to read these massive shelf-destroying tomes that seem to be churned out recently.
It covers everything you need to know with concise examples, which is what makes this book really shine. You start with the basics using LWP::Simple through to more advanced topics using LWP::UserAgent, HTTP::Cookies, and WWW::RobotRules. Sean shows finger saving tips and shortcuts that take you more than a couple notches above what you can learn from the lwpcook manpage, with enough depth to satisfy somebody who is an experienced LWP hacker.
This book is a great reference, just flick through and you'll find a relevant chapter with an example to save the day. Chapters include filling in forms and extracting data from HTML using regular expressions, then more advanced topics using HTML::TokeParser, and then my preferred tool, the author's own HTML::TreeBuilder. The book ends with a chapter on spidering, with excellent coverage of design and warnings to get your started on your web trawling.
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