The Repeat Visitor
A medium Python mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- Domain
- Python
- Difficulty
- medium
- Seniority
- L4
Interview Prompt
You're combing purchase logs for a retail loyalty team, where each record carries a `user` and a `date` string in 'YYYY-MM-DD' format. A user counts as a repeat visitor if two of their purchases fall within `days` of each other on the calendar. Return the IDs of those users.
Summary
Loyal customers come back sooner than expected.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write and run your Python against test cases
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision