Linked Lists- length of List

    def length_iterative(self):

        count = 0
        current_node = self.head

        while current_node:
            count += 1
            current_node = current_node.next
        return count

    def length_recursive(self, node):
        if node is None:
            return 0
        return 1 + self.length_recursive(node.next)