March 2001
Intermediate to advanced
1296 pages
38h 8m
English
Content preview from Programming Python, Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The PyErrata Web Site
The last chapter concluded with a discussion of the downsides of deploying applications on the Web. But now that I’ve told you all the reasons you might not want to design systems for the Web, I’m going to completely contradict myself and present a system that cries out for a web-based implementation. This chapter presents the PyErrata web site, a Python program that lets arbitrary people on arbitrary machines submit book comments and bug reports (usually called errata) over the Web, using just a web browser.
PyErrata is in some ways simpler than the PyMailCgi case study presented in the previous chapter. From a user’s perspective, PyErrata is more hierarchical than linear: user interactions are shorter and spawn fewer pages. There is also little state retention in web pages themselves in PyErrata; URL parameters pass state in only one isolated case, and no hidden form fields are generated.
On the other hand, PyErrata introduces an entirely new dimension: persistent data storage. State (error and comment reports) is stored permanently by this system on the server, either in flat pickle files or a shelve-based database. Both raise the specter of concurrent updates, since any number of users out in cyberspace may be accessing the site at the same time.
System Goals
Before you ponder too long over the seeming paradox of a book that comes with its own bug-reporting system, I should provide a little background. Over the last five years, I’ve been fortunate ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.