The Slow Leak
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
A metrics rollup arrives in `nested`: a list where each element is either a leaf reading or another sub-group, with sub-groups nested to arbitrary depth. Return one flat list of every reading in left-to-right order. Treat a string as a single reading that stays intact rather than splitting into characters, and let an empty sub-group contribute nothing.
Summary
Nested groups. One flat stream.
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