Daily challenge · 2026-11-12 (UTC)
Keep identifiers as text and parse yes/no flags
Member IDs and postcodes have leading zeros that must survive, and the opt-in flag arrives as Y, yes, TRUE or 1. Parse the flag to a real boolean without guessing.
Today's challenge is solved in Python and pandas. It's a free, reviewed exercise graded on the visible dataset and on hidden datasets, like every exercise here. Challenges come from a fixed, versioned schedule (v1-2026-11), never from live AI generation.
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