Projects / Beginner
What you end up with
Seven tests that pin down the boundaries, and an implementation that passes all of them. The next person to touch it finds that the table of tests works as the spec.
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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 build a pricing table of three plans that holds its shape from a 360px phone up to a wide screen. The aim is to let it wrap because the content is cramped, without writing a single @media rule.
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.