Stack

__author__ = 'Shail'
a = list();
n = int(input("Size of stack: "));
count = 0;
while True:
    print(a[:]);
    choice = int(input("1.Push 2.Pop 3.Exit: "));
    if choice == 1:
        if count == n: print("Stack is full.");
        else:
            a.append(input("Enter a number to push: "));
            count += 1;
    elif choice == 2:
        if count == 0: print("Stack is empty.");
        else:
            del a[count-1];
            count -= 1;
    elif choice == 3:
        break;
    else: print("Enter 1, 2, or 3.");