I'm considering using django properties on some models that are mostly tabulated numerical data. I'm want to derive some numerical scores from some of the columns of data I'm using as input. If I use properties for these derived scores, what is actually happening. Does Django put these into my models as fields and compute each score when a model instance is saved, Or is simply calling the property function when I ask for the property? Or is is evaluated when a query set is evaluated? i am dealing with a large amount of data so efficiency is important I may not need to score every row in my DB, But being able to have indexed lookup by my derived scores would be nice Should I define these scores as fields in my model to get them into the DB Or will propterties do something like this for me? Are properties anything else than python functions defined on a Class Or does django build in some special functionality for them? Doug
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