The query params were never in the lambda to begin with. Python function calls have strict (not lazy) semantics, i.e. "applicative order", i.e. both expressions passed as arguments to map() are evaluated before the map body gets them as parameters, thus the query params would only be evaluated once, even when inlined as they were originally.

Same with the lambda definition: it's evaluated only once. It's just the lambda body that gets reevaluated each loop, and only evaluated for the first time on the first loop.