Day 13/420: CSV, JSON, and serialization basics

420 Day Python Production Track

Today I wanted csv, json, and serialization basics to feel like a real engineering decision, not a syntax demo. The useful shift was turning csv, json, and serialization basics into something I can explain from the code instead of memorizing from a tutorial.

The checks that mattered were data shapes that stay obvious at a glance, control flow that makes valid states visible, and small units of logic that remain easy to test.

The failure mode I was actively trying to avoid was letting convenience hide where state changes actually happen. I kept it tied to one realistic Python workflow so the lesson would sound like something I could defend in review instead of something I only recognized from a course.

That is the bar I want from this track: code that stays readable when requirements move, not just code that runs today.