diff --git a/python-mutable-immutable/point.py b/python-mutable-immutable/point.py
index 0758289177..a2aeb8474e 100644
--- a/python-mutable-immutable/point.py
+++ b/python-mutable-immutable/point.py
@@ -23,7 +23,7 @@ def __get__(self, instance, owner):
         return instance.__dict__[f"_{self._name}"]
 
     def __set__(self, instance, value):
-        raise AttributeError(f"can't set attribute {self._name}")
+        raise AttributeError(f"can't set attribute '{self._name}'")
 
 
 class Point: