In this exercise you will implement, in Python, several Tree methods.

• add(value) - This method adds a key-value pair to the Binary Search Tree
• find(value) - This method returns the matching value for the given key if it is in the tree and None if the key is not found in the tree.
• Traversals: These methods return an array of dictionaries consisting of all the key-value pairs in the tree in a specific order.
  • inorder - This method returns an array of all the elements in the tree, in order.
  • postorder - This method returns an array of all the elements in a postorder fashion (left, right , root).
  • preorder - This method returns an array of all the elements in a preorder fashion (root, left, right).
• height - This method returns the height of the binary search tree.

• bfs - This method returns an array with the tree elements in a level-by-level order (see Breadth-First traversal)