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The First Encounter

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

Your team is building a data quality tool that needs to track the first time each unique value appears in a sequence. Given a string, return a dictionary mapping each character to the index of its first occurrence. Characters that appear multiple times should only record the first position.

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