Stacks in Python — A Practical Guide to LIFO Data Structures

Stacks in Python follow the Last In First Out (LIFO) principle, like placing and eating pancakes from the top of a pile. Python offers multiple implementation options: native lists for simple applications, collections.deque for memory efficiency, queue.LifoQueue for thread safety, or custom classes for specialized behavior. Stacks power essential functions like expression parsing, undo/redo capabilities, and depth-first searches, with core operations (push, pop, peek) typically performing at O(1) time complexity.