Day 17/420: Packages and project layout basics
420 Day Python Production Track
Today I wanted packages and project layout basics to feel like a real engineering decision, not a syntax demo. The useful shift was turning packages and project layout 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 treated it like a build day, where the only useful explanation is one that survives contact with an actual repository and a real set of constraints.
That is the bar I want from this track: code that stays readable when requirements move, not just code that runs today. I also want to keep tracing one concrete path through the code because that exposes weak assumptions faster than a larger demo.
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