Implementation of stack in Python using lists.

stack=[]
def PUSH():
    val=input('Enter an integer: ')
    num=int(val)
    stack.append(num)
def POP():
    if len(stack)==0:
        print('Stack is Empty.')
    else:
        deletedelement=stack.pop()
        print(deletedelement, ' is deleted.')
def Display():
    
    N=len(stack)
    if N!=0:
        for i in range(N-1,-1,-1):
            print(stack[i],'->')
    else:
        print('Stack is Empty.')

opt='Y'
while opt=='y' or opt=='Y':
    print('1.PUSH')
    print('2.POP')
    print('3.Display')
    choice=input('Enter the option: ')
    if choice=='1':
        PUSH()
    elif choice=='2':
        POP()
    elif choice=='3':
        Display()
    opt=input('Do you want to continue: ')