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Stream-Process a Large CSV

A hard Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.

Domain
Python
Difficulty
hard
Seniority
senior, staff

Interview Prompt

Write a function that reads a CSV file and sums all values in a given column. The file could be several gigabytes, so you can't load it all into memory. Handle missing or non-numeric values gracefully.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write your python solution with real code execution
  4. Get instant feedback and a hire/no-hire decision