Add following methods to [BinarySearchTreeNode class](https://github.com/codebasics/data-structures-algorithms-python/blob/master/data_structures/8_Binary_Tree_1 ...

Credits to https://www.youtube.com/@codebasics for these two video tutorials: https://www.youtube.com/watch?v=lFq5mYUWEBk (Binary Tree Part 1 | BST | Binary Search ...

They form the building blocks for advanced data structures. Python does not have in-built implementation ... Every child node further has child nodes of its own. However, binary trees can only have ...