The Shortest Path Home
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
- L3
Interview Prompt
API responses arrive as dicts nested arbitrarily deep, and the warehouse needs them as single-level rows. Collapse `nested` into a flat dict whose keys are the full path down to each leaf, joined by `separator`, where any value that is not itself a dict is a leaf. An empty inner dict contributes no key, so that branch simply disappears from the result.
Summary
Every leaf remembers the road it came from. Bring them all back on one line.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your python solution with real code execution
- Get instant feedback and a hire/no-hire decision