Duplicate Entries Function | Dataford Interview Questions

During QA validation of the Oakley Prizm catalog, each imported product identifier should appear only once. Given a list of catalog IDs, determine whether any identifier occurs more than once.

Return True if at least one duplicate exists. Return False when every identifier is unique.

Formal Specification

Implement contains_duplicate(entries), where entries is a list of strings. The function must return a boolean and must compare identifiers using exact, case-sensitive string equality. An empty list contains no duplicates.

Constraints

0 <= len(entries) <= 100,000
Each identifier is a non-empty string of at most 64 characters
Identifier comparisons are case-sensitive

Function Signature

def contains_duplicate(entries):

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