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The Lazy Stream
A hard Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Python
- Difficulty
- hard
- Seniority
- senior, staff
Interview Prompt
Implement a generator class that accepts another iterable and yields its elements one at a time. Then implement a second class that wraps the first and lazily flattens one level of nesting - if a yielded element is itself iterable (but not a string), yield its elements individually. Demonstrate with a test sequence.
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