The Tail End

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

Domain

Python

Difficulty

easy

Seniority

junior

Problem

Our expression evaluator needs a stack data structure. Implement a Stack class backed by a list, with push, pop, peek, and is_empty operations. Pop and peek on an empty stack should return None rather than throwing - the parser handles empty gracefully.

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