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The Intervals

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
junior

Interview Prompt

Our analytics pipeline groups events into weekly cohorts for retention analysis. Write a function that takes a list of date strings (YYYY-MM-DD) and buckets them into weeks - week 1 starts from the earliest date. Return a dict mapping week number to its list of dates.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write your python solution with real code execution
  4. Get instant feedback and a hire/no-hire decision