The Ones That Come Back
An easy 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
- easy
- Seniority
- L3
Interview Prompt
A data-quality check on an event export flagged a column of integer `ids` that's supposed to be unique but isn't. Return the id values that show up more than once.
Summary
In a column that promised uniqueness, some values kept their seat. Name them.
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