How to use stacks in Python

A stack is a linear data structure where inserted elements are kept in insertion order and only the last one to be added is removed, this is also known as LIFO (last in first out) behavior. A traditional Stack supports three operations: Insertion or push Peek or top Deletion or pop Execution times for both operations can vary slightly depending on the implementation, all three can be executed in constant times O(1) with the right data structure. Examples Consider the following list of numbers, l