All the Way Down
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
The payload nests without end. The warehouse needs one flat row.
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