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The One-of-Each

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

The upstream data feed keeps sending duplicate records, and the warehouse load is rejecting the batch. Write a function that takes a list of records and a key field name, then returns a clean list with duplicates removed based on that key, keeping the first occurrence of each.

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