from collections import namedtuple


def count(node):
    counter = 0
    if node[0] is None and node[1] is None:
        counter += 1
        return counter
    if node[0] is not None:
        print(node, "------ left")
        counter += count(node[0])
    if node[1] is not None:
        print(node, "------ right")
        counter += count(node[1])

    return counter


if __name__ == "__main__":
    Node = namedtuple("Node", ["left", "right"])
    tree = Node(None, Node(Node(None, None), Node(None, None)))
    tree2 = Node(left=Node(left=None, right=None), right=Node(left=None, right=None))
    print(count(tree))  # 2
    print(count(tree2))  # 2