Create

First create a class Stack

class Stack:

    def __init__(self):
        self.items = []

    def is_empty(self):
        """Returns True if the stack is empty."""
        return len(self.items) == 0

    def size(self):
        """Returns the number of items in the stack."""
        return len(self.items)

    def __str__(self):
        """Returns a string representation of the stack."""
        return str(self.items)