Write push(rollno) and pop() method in Python:

push(rollno) — to add roll number in Stack

pop() — to remove roll number from Stack

stack = []

def push(rollno):
    stack.append(rollno)
    print("Roll number", rollno, "added to the stack.")

def pop():
    if not is_empty():
        rollno = stack.pop()
        print("Roll number", rollno, "removed from the stack.")
    else:
        print("Stack is empty, cannot perform pop operation.")

def is_empty():
    return len(stack) == 0

push(11)
push(12)
push(13)

pop()
pop()

Roll number 11 added to the stack.
Roll number 12 added to the stack.
Roll number 13 added to the stack.
Roll number 13 removed from the stack.
Roll number 12 removed from the stack.