class LinkListStack(object):
def __init__(self):
self._data = LinkedList()
def __len__(self):
return self._data.len
def push(self, x):
self._data.add_last(x)
def pop(self):
return self._data.remove_last()
def peek(self):
last = self._data.get_last()
print(last.val)
return last
def printStackItems(self):
self._data.print_list()
