The Column Shuffle

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

Domain

Python

Difficulty

medium

Seniority

L6

Problem

A long-format metrics export gives you one record per reading, each carrying an `id` and a single `amount`, and the same `id` can recur across many records. For each id, spread its amounts across numbered keys `amount_1`, `amount_2`, and so on in the order they appear, and return one dict per id (its `id` plus those keys) with ids in first-appearance order.

Summary

Rows in, columns out. Number them.

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