How to use stacks in Python

Short summary

Stacks are LIFO data structures with three core operations: push, pop, and peek. Python offers multiple implementations—lists (O(1) amortized), deques (O(1) all operations), or custom classes for stricter control. Real-world applications include parentheses matching, tree traversals, and DFS algorithms.

• •LIFO structure with constant-time push, pop, and peek operations
• •Python implementations compared: list (amortized O(1)), deque (O(1) all ops), custom class (full control)
• •Practical use cases: bracket matching, tree traversal, DFS, undo/redo systems

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