Deletion from tree not happening when there is only one node.

[itsmepsk]

Deletion not happening when there is only one node. The code should go like this:
tree = tree.delete(17)

[sandeep21tw]

Did you find the solution?
i don't know the reason but i think this is something related to the fact we are returning None in the delete method. i don't understand how returning None is deleting the node in the first place!?