Portfolio Profit Calculator

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

Domain

Python

Difficulty

medium

Seniority

L6

Problem

You are given prices, a dict mapping each date string to that day's price, and purchases, a list of [date, quantity] pairs (each quantity is an integer number of shares bought on that date). Let latest_price be the price at the chronologically latest date key in prices. Compute the total profit as the sum over every purchase of quantity * (latest_price - prices[date]), where prices[date] is the price paid on the purchase date. Return that total as a float. A positive result is profit; a negative result is a loss.

Summary

Portfolio gain from purchase history and current prices.

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