Every Line on the Receipt

A medium Python interview practice problem on DataDriven. Write and execute real python code with instant grading.

Domain

Python

Difficulty

medium

Seniority

L5

Problem

Transaction events arrive as nested structures: each event is a dict with a store_id (str), a timestamp (str), and an items list of dicts (each item has item_name and item_price). Write `flatten_transactions(events)` that explodes every event into one record per item, returning a flat list of dicts where each record carries store_id, item_name, timestamp, and item_price from its parent transaction. An event with an empty items list produces zero records (do not emit placeholder rows). An empty input list returns an empty list. Preserve the natural order: events in input order, and within each event the items in their listed order.

Summary

Nested deep inside the receipt. Pull every item out.

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