Need to examine and act on old vs. new at .save() time

Hi all,

I need to be able to determine, at .save() time (before I call the
parent class' .save()), if a certain field on my model object was
changed, and act on that via some custom code. How can I do this,
bearing in mind that we call .save() from non-web code, etc? We use
Django's ORM from various other non-web interfaces and code. My point
is that we can't just inspect a web form's result data.

I'd appreciate any thoughts.

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