Thanks to all for your clear answers. I learned a lot about the way Python manages properties or attributes.
In my particular case, I think, as Spir said, that the best implementation depends on wether I am going to update the "base" properties very often or not, and wether I am going to access "the secondary properties" many times or not. I didn't realized that, in case I define "firstpart" as a property, I have to update it every time the "list" property is updated/changed. Thank you for that obvius detail! And thank you also for the advice about the name of properties. I agree with getting the "list_" prefix out. Thank you!! -- Vicent
_______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
