Learn Tree Traversal by Building a Binary Search Tree - Step 24

Python
1

Tell us what’s happening:

He is asking me to call _search in the search function but i am not sure where exactly i am going wrong as i am following the steps mentioned by him can someone please help me.

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

# User Editable Region

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

# User Editable Region

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Challenge Information:

Learn Tree Traversal by Building a Binary Search Tree - Step 24

2

You don’t need to include the return keyword. Just call the method.

3

ok let me try and will update you how it goes.

4

thanks that did worked and now i am able to move other steps will make sure that return is not used until they have asked it.

1 Like