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
Given a possibly-nested list, return a single flat list of all leaf values in order. Nesting is arbitrarily deep. Strings are leaves, not iterated character-by-character.
Summary
Nested iterators. 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