I was unable to find much elaboration on how user-defined functions
are implemented in sage. I tried things like "user-defined functions"
site:sagemath.org in google, and very little turned up.

In particular, I'm desiring to work with user-defined functions that
reference variables whose values change during a session. For example,
imagine there's a list CurrentPrices containing three values, then I
might want a function BidIsLower(x) such that BidIsLower(x) is "true"
if x is smaller than all current values in the list and false
otherwise.

Thanks.

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