The Column Shuffle

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

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 every id, lay its amounts out in the order they appear under keys `amount_1`, `amount_2`, and so on (an id with three readings gets three keys, an id with one reading gets one), and return a dict per id holding its `id` plus those numbered keys. Emit ids in first-appearance order and keep each id's amounts in input order rather than combining them.

Summary

Rows in, columns out. Number them.

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