From 39922339a3adfae9b8ec3a7b063392fddb8f283b Mon Sep 17 00:00:00 2001
From: bt3gl <138340846+bt3gl-cryptographer@users.noreply.github.com>
Date: Tue, 8 Aug 2023 15:03:55 -0700
Subject: [PATCH] Update bst_is_balanced.py

---
 trees/bst_is_balanced.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/trees/bst_is_balanced.py b/trees/bst_is_balanced.py
index 7acb0b0..1d3772b 100644
--- a/trees/bst_is_balanced.py
+++ b/trees/bst_is_balanced.py
@@ -5,7 +5,7 @@
 
 def height(root):
   
-    if not root:
+    if root is None:
       return -1
       
     return 1 + max(height(root.left), height(root.right))
@@ -13,7 +13,7 @@ def height(root):
 
 def is_balanced(root):
   
-    if not root:
+    if root is None:
       return True
 
     return abs(height(root.left) - height(root.right)) < 2 and \