Stacks

data=input("Enter your Data!: ")

myStack=["a","b","c","d","","",""]
pointerTop=3
stackMax=len(myStack)-1

def push(myStack,pointerTop,data):
    if pointerTop==stackMax:
        print("Sorry this stack is full!")
    else:
        pointerTop=pointerTop+1
        myStack[pointerTop]=data
        print("Data Saved!")

    print(myStack)

    pop(myStack,pointerTop)

def pop(myStack,pointerTop):
    myStack[pointerTop]=""
    print("Data Deleted")
    pointerTop=pointerTop-1
    print(myStack)



push(myStack,pointerTop,data)