update closest-binary-search-tree-value.py (#29)

* update closest-binary-search-tree-value.py

make it a bit clear

* Update closest-binary-search-tree-value.py

Author: sangheestyle

Python/closest-binary-search-tree-value.py

@@ -13,12 +13,11 @@ def closestValue(self, root, target):
         while root:
             if abs(root.val - target) < gap:
                 gap = abs(root.val - target)
-                closest = root
+                closest = root.val
             if target == root.val:
                 break
             elif target < root.val:
                 root = root.left
             else:
                 root = root.right
-        return closest.val
-
+        return closest