Question

•PYTHON!!!!!!!!!!!

Design Stack class using composition, but this time, use the beginning of the list as the reference to push or pop items.

Answer 1

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

    def isEmpty(self):
        return len(self.items) == 0

    def push(self, item):
        self.items.append(item)

    def pop(self):
        return self.items.pop()

    def __len__(self):
        return len(self.items)

    def __str__(self):
        return str(self.items)

def main():
    s = Stack()
    s.push('plate 1')
    s.push('plate 2')
    s.push('plate 3')
    print(s)
    print(len(s))
    print(s.pop())
    print(s.pop())
    print(s.pop())
    print(s.isEmpty())

main()