Update binary-search-tree.py

ivanmmarkovic · web-flow · commit 526a0be7d68b · 2022-02-16T15:14:11.000+01:00
diff --git a/trees/binary-search-tree.py b/trees/binary-search-tree.py
@@ -107,7 +107,7 @@ def _get(self, root: TreeNode, key) -> TreeNode:
 
     def contains(self, key) -> bool:
         if self.is_empty():
-            return None
+            return False
         found: bool = False
         node: TreeNode = self.root
         while node is not None and not found:
