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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

Interview Prompt

Config files arrive as flat dicts with dot-notation keys like 'database.host.port' and need to be expanded before use. Convert the flat dict into a nested dict structure where each dot segment becomes a level of nesting.

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