### Tell us what’s happening:

Didn’t I do exactly what it said? Isn’t my indentation correct?

Now, to perform the actual insertion, define an empty insert method within the BinarySearchTree class and give it a self parameter.

### 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
# User Editable Region
def _insert(self):
pass
# User Editable Region
```

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### Challenge Information:

Learn Tree Traversal by Building a Binary Search Tree - Step 16