Stock Range Finder

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

Domain

Python

Difficulty

medium

Seniority

L3

Problem

The market-data team dumps end-of-day OHLCV bars as a list of CSV rows, one string per ticker per trading day in the form `Date,Ticker,Open,High,Low,Close,Volume` (no header row). A trader wants a quick volatility snapshot for one symbol: the day it had the widest intraday swing (High minus Low, earliest Date on ties) and its average daily Volume over the dump. Implement `analyze_ticker(lines, ticker)` that returns a dict with keys `max_range` (float, the largest High-Low value), `max_range_date` (str, the date of that day), and `avg_volume` (float, the mean Volume across the symbol's rows). Return an empty dict if the symbol never traded.

Summary

Prices move. One stretch had the widest gap.

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