interactive-coding-challenges/graphs_trees/bst/bst.py

class Node(object):

    def __init__(self, data):
        self.data = data
        self.left = None
        self.right = None

    def __str__(self):
        return str(self.data)


def insert(root, data):
    if data <= root.data:
        if root.left is None:
            root.left = Node(data)
        else:
            insert(root.left, data)
    else:
        if root.right is None:
            root.right = Node(data)
        else:
            insert(root.right, data)