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The Pandas Pivot

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
mid, senior

Interview Prompt

Given a list of event records, each with a user ID, event type, and integer amount, pivot the data so each user has one row and each event type becomes a column. Values should be the sum of amounts for that user and event type. Return a list of dicts representing the pivoted rows, sorted by user ID.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write your python solution with real code execution
  4. Get instant feedback and a hire/no-hire decision