No-Repeating-Characters Check | Dataford Interview Questions

A Granicus content workflow needs to validate a string before processing it. Implement an algorithm that returns True when every character appears exactly once, and False when any character appears more than once.

Character comparisons are case-sensitive, and spaces and punctuation count as characters. For example, A and a are different characters.

Formal Specification

Implement has_unique_characters(s), where:

Input: s, a string containing zero or more characters.
Output: A boolean. Return True if no character occurs more than once; otherwise, return False.

Constraints

0 <= len(s) <= 100,000
The string may contain Unicode characters
Spaces and punctuation count as characters
Character comparisons are case-sensitive

Function Signature

def has_unique_characters(s):

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