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The Stream Averager

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
senior

Interview Prompt

The IoT pipeline receives sensor readings tagged with a key, and the dashboard needs running averages per sensor at any point in the stream. Build a class with add(key, value) to record a reading and get_averages() to return a dict mapping each key to its current mean value.

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