October 2007
Intermediate to advanced
65 pages
1h 33m
English
Content preview from Getting Started with Pyparsing
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Getting Started with Pyparsing
Copyright © 2007 O'Reilly Media, Inc.
October XX, 2007
Abstract
Need to extract data from a text file or a web page? Or do you want to make your application more flexible with user-defined commands or search strings? Do regular expressions and lex/yacc make your eyes blur and your brain hurt?
Pyparsing could be the solution. Pyparsing is a pure-Python class library that makes it easy to build recursive-descent parsers quickly. There is no need to handcraft your own parsing state machine. With pyparsing, you can quickly create HTML page scrapers, logfile data extractors, or complex data structure or command processors. This Short Cut shows you how!
| "I need to analyze this logfile..." |
| "Just extract the data from this web page..." |
| "We need a simple input command processor..." |
| "Our source code needs to be migrated to the new API..." |
Each of these everyday requests generates the same reflex response in any developer faced with them: "Oh, *&#$*!, not another parser!"
The task of parsing data from loosely formatted text crops up in different forms on a regular basis for most developers. Sometimes it is for one-off development utilities, such as the API-upgrade example, that are purely for internal use. Other times, the parsing task is a user-interface function to be built in to a command-driven application.
If you are working in Python, you can tackle many ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.