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The First Stranger
A easy Python interview practice problem on DataDriven. Write and execute real python code with instant grading.
- Domain
- Python
- Difficulty
- easy
- Seniority
- junior, mid
Problem
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.
Practice This Problem
Solve this Python problem with real code execution. DataDriven runs your Python code in a sandboxed Docker environment and grades it instantly.