class Node(object):

    def __init__(self, data, rChild=None, lChild=None):
        super(Node, self).__init__()
self.data = data
self.rChild = rChild
self.lChild = lChild


class Tree(object):

    def __init__(self):
        super(Tree, self).__init__()
self.root = None
self.size = 0
Implementing binary search tree