The Online Elite

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 merchants (list of dicts with merchant_id and name), payments (list of dicts with merchant_id, amount, mode), and integer top_n, filter payments to mode = 'online'. Per merchant_id, sum amount. Rank merchants by that sum descending. Take the top_n merchants. Return the average of all online payment amounts belonging to those top-n merchants as a single float. If there are no qualifying online payments, return 0.0.

Summary

The top performers are hiding in the data.

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