Question

Write push(books)and pops(books)methods in python to add books and remove books considering them to act as push and pop operations of stack.

Answer 1

Push and Pop are operations of Stack:

Push: Adds item on to stack

Pop: Removes item from the stack

Always pop is done by taking out elements from the top. Push always pushes new item to the top.

class StackPushPop:

    def __init__(self):

        self.items = []

    def pushitems(self, item):

        self.items.append(item)

    def popitems(self):

        return self.items.pop()

s1=StackPushPop()

s1.pushitems(9)

s1.pushitems(‘Elephant’)

s1.pushitems(True)

//After pushing elements, the size of the stack

print(s1.size())

print(s1.isEmpty())

s1.push(9.3)

print(s1.popitems())

print(s1.popitems())

//After removing 2 items

print(s1.size())

Answer 2

Go through the image.......,.............