A easy Python interview practice problem on DataDriven. Write and execute real python code with instant grading.

Domain

Python

Difficulty

easy

Seniority

L5

Problem

Given a string, return the first character that appears exactly once. Return '' if no such character exists.

Summary

It appeared exactly one time. That made it special.

Practice This Problem

Solve this Python problem with real code execution. DataDriven runs your Python code in a real environment and grades it automatically.