Web scraping - how to identify main content on a webpage

There are a number of ways to do it, but, none will always work. Here are the two easiest:

• if it's a known finite set of websites: in your scraper convert each url from the normal url to the print url for a given site (cannot really be generalized across sites)
• Use the arc90 readability algorithm (reference implementation is in javascript) http://code.google.com/p/arc90labs-readability/ . The short version of this algorithm is it looks for divs with p tags within them. It will not work for some websites but is generally pretty good.

A while ago I wrote a simple Python script for just this task. It uses a heuristic to group text blocks together based on their depth in the DOM. The group with the most text is then assumed to be the main content. It's not perfect, but works generally well for news sites, where the article is generally the biggest grouping of text, even if broken up into multiple div/p tags.

You'd use the script like: python webarticle2text.py <url>

There's no way to do this that's guaranteed to work, but one strategy you might use is to try to find the element with the most visible text inside of it.