Python / Pandas / EDA Screens

# Python / Pandas / EDA Screens (Ecommerce + RFM Cases) Solve 3 timed pandas cases: the screen rewards working code + narration, not perfect syntax. ## Case 1 — messy orders (20 min) Load the ecommerce orders CSV; fix dtypes, dedupe, build monthly revenue + top-10 products. Narrate each step: what you assume, what you check. ## Case 2 — RFM mini (20 min) Recency/frequency/monetary quintiles on the transactions file; name 2 segments and one action each. Pattern follows the RFM35 EDA playbook. ## Case 3 — join trap (15 min) Two files with mismatched keys (case + whitespace). Clean keys, left-join, report the unmatched rate. The trap is silent row loss — always count before and after the join.