diff --git a/04_quicksort/python/04_recursive_max.py b/04_quicksort/python/04_recursive_max.py
index c32fb54..908c31a 100644
--- a/04_quicksort/python/04_recursive_max.py
+++ b/04_quicksort/python/04_recursive_max.py
@@ -1,5 +1,8 @@
-def max(list):
-  if len(list) == 2:
-    return list[0] if list[0] > list[1] else list[1]
-  sub_max = max(list[1:])
-  return list[0] if list[0] > sub_max else sub_max
+def max_(lst):
+  if len(lst) == 0:
+    return None
+  if len(lst) == 1:
+    return lst[0]
+  else:
+    sub_max = max_(lst[1:])
+    return lst[0] if lst[0] > sub_max else sub_max