The Lazy Unpacker
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
- L4
Interview Prompt
Given a list `nested` nested to arbitrary depth, implement `flatten_generator(nested)` that lazily yields each non-list leaf value in order using a recursive generator, then materializes and returns the leaves as a flat `list`. Non-list elements (ints, etc.) are leaves; lists are recursed into. An empty list yields nothing (returns `[]`). Order is preserved (left to right, depth-first).
Summary
Instead of loading it all at once, yield it one piece at a time.
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