Mis on virn Pythonis?

In Python, a stack is a data structure that operates on the LIFO (Last In, First Out) principle, meaning the last added element is the first to be removed. Python does not have a separate built-in "stack" type, but it can be implemented using a list (list), utilizing the append() method for adding and the pop() method for removing elements from the end of the list.

Example of implementing a stack in Python:

stack = []

# Adding elements
stack.append(1)
stack.append(2)
stack.append(3)

# Removing elements
print(stack.pop())  # Will print 3
print(stack.pop())  # Will print 2

Stacks are often used in algorithms, for example, for traversing graphs, implementing recursion, processing expressions, etc.