Ian Bicking: the old part of his blog

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related:

http://www.livejournal.com/users/glyf/6877.html

(my own guideline is that "your application's data format is part of the design, and if you never look at it, how can you know if it's any good". fwiw, I only use pickle when I need to cache stuff on disk, and even then I tend to stick to simple data types).
Comment on Persistent Persistence
by Fredrik