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
- L4
Interview Prompt
Given a list of event dicts (each with 'user_id', 'event_type', 'amount'), pivot so each user becomes one dict with 'user_id' plus one column per distinct event_type summing the amounts. Return a list of per-user dicts. Missing event_types for a user are 0. Sort the list by user_id ascending.
Summary
Rows become columns. Columns become power.
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