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Unflatten Keys

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

Domain
Python
Difficulty
medium
Seniority
L4

Interview Prompt

Given a flat dict whose keys use dot notation like 'a.b.c', build and return a nested dict where each dot segment becomes a nested key.

Summary

Dots in the key names. Rebuild the structure.

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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