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The First Stranger
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
- junior, mid
Interview Prompt
A spam filter needs to identify the first character in a message that appears exactly once, from left to right, to generate a unique fingerprint. Write a function that takes a string and returns the first non-repeated character. Return an empty string if all characters repeat.
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