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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

Interview Prompt

Given a list of record dicts, return a dict per column name with 'null_count' and 'non_null_count'. Consider a value null when it is Python None.

Summary

The data is not as clean as it looks.

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

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