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The Forward Fill

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

Domain
Python
Difficulty
easy
Seniority
junior, mid

Interview Prompt

Our analytics pipeline ingests sensor readings that occasionally drop to None during network hiccups. The downstream dashboard can't render gaps, so it needs a clean version of the stream. Write a function that takes the raw readings and produces a patched list where every gap has been filled in.

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