The Pandas Pivot

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

Domain

Python

Difficulty

medium

Seniority

L4

Problem

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.

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