def push(self, data):
node = SLLNode(data)
if self.top is None:
self.top = node
else:
node.next = self.top
self.top = node
self.size += 1
def push(self, data):
node = SLLNode(data)
if self.top is None:
self.top = node
else:
node.next = self.top
self.top = node
self.size += 1
