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The Lone Character
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
- senior
Interview Prompt
Our search indexer assigns a unique shard key based on the first non-repeated character in a string. Write a function called first_unique_char that takes a string and returns the first character appearing exactly once. Return an empty string if every character repeats.
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