Update data_structures/binary_tree/binary_tree_traversals.py

Co-authored-by: Christian Clauss <[email protected]>

Author: rajansh87

data_structures/binary_tree/binary_tree_traversals.py

@@ -24,6 +24,8 @@ def preorder(root):
     PreOrder traversal: visit root node
     then its left subtree followed
     by right subtree.
+    preorder(make_tree())
+    1 2 4 5 3
     """
     if root:
         print(root.data, end=" ")