### Tell us what’s happening:

The problem I’m having is with the assignment of the call to the _delete method. The challenge says “Assign the function call to the left node.” But I’m not sure what “left node” it’s talking about. I’ve tried:

```
left = _delete(node.left, key)
node.left = _delete(node.left, key)
self.left = _delete(node.left, key)
```

None of them work. Is there maybe something else that I’m missing?

### 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)
# User Editable Region
def _delete(self, node, key):
if node is None:
return node
if key < node.key:
_delete(node.left, key)
# User Editable Region
```

### Your browser information:

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### Challenge Information:

Learn Tree Traversal by Building a Binary Search Tree - Step 32