Learn Tree Traversal by Building a Binary Search Tree - Step 36

Python
1

Tell us what’s happening:

what am i missing out here? could someone help me out?

Your code so far

class TreeNode:
    def __init__(self, key):
        self.key = key
        self.left = None
        self.right = None

class BinarySearchTree:
    def __init__(self):
        self.root = None

    def insert(self,key):
        self.root = self._insert(self.root, key)

    def _insert(self, node, key):
        if node is None:
            return TreeNode(key)
        if key < node.key:
            node.left = self._insert(node.left, key)
        elif key > node.key:
            node.right = self._insert(node.right, key)
        return node

    def search(self, key):
        return self._search(self.root, key)

    def _search(self, node, key):
        if node is None or node.key == key:
            return node
        if key < node.key:
            return self._search(node.left, key)
        return self._search(node.right, key)

    def delete(self, key):
        self.root = self._delete(self.root, key)

    def _delete(self, node, key):
        if node is None:
            return node
        if key < node.key:
            node.left = self._delete(node.left, key)
        elif key > node.key:
            node.right = self._delete(node.right, key)

# User Editable Region

        else:
            if node.left is None:
                return node.right
        elif:
            if node.right is None:
                return node.left

# User Editable Region

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Challenge Information:

Learn Tree Traversal by Building a Binary Search Tree - Step 36

2

Hey, you cannot write an elif after the else. You need to add an elif after the if statement.

Basically, what you wrote here is correct.

3

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