The Column Shuffle
A medium Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Python
- Difficulty
- medium
- Seniority
- L6
Interview Prompt
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.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your python solution with real code execution
- Get instant feedback and a hire/no-hire decision