Projects / Beginner
What you end up with
One pricing.html. No horizontal scroll at 360px, three cards side by side on a wide screen, and the recommended plan readable without relying on colour alone.
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Starting from a single orders CSV, you narrow down where sales are falling, working from the whole to the breakdown to one candidate. Using nothing but pandas aggregation, you finish with a one-page report holding a conclusion, its evidence, what the data cannot tell you, and one next step.
You take a function that does not match its spec and fix it by writing a failing test first rather than diving in. You learn how to pick the boundaries, and what to leave behind once it is fixed.
Writing types protects you at compile time, but a type annotation cannot protect a value that came from outside. You build a type guard that narrows from unknown, rejecting the rows that do not fit while counting them.