The Stream Averager
A easy Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Python
- Difficulty
- easy
- Seniority
- L5
Interview Prompt
Implement StreamAverager with add(key, value) and get_averages(). add records a reading; get_averages returns a dict mapping each key to the average of its values. Test harness: ['add', key, value] and ['get_averages']; returns parallel list (None for add, dict for get_averages).
Summary
The answer moves with the data.
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