PYTHON PROBLEM 087 · Intermediate

Find the first nonrepeating character: Unique letter exists

Find the earliest character that appears only once.

Counter · generator expressionCountergenerator expression

PROBLEM OVERVIEW

What this Python exercise asks you to practise

This scenario tests find the first nonrepeating character. It belongs to the Strings and Text Processing roadmap and uses the counter · generator expression pattern.

Indexing, slicing, searching, formatting, normalization, and character-by-character logic.

COMPLETE WORKSPACE

Learn the plan, trace the logic and run the solution

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SKILL TO CARRY FORWARD

Pattern relevance

This exercise strengthens counter · generator expression. Be ready to explain the input, the rule, the boundary cases, and why the chosen approach is appropriate.