gh-116535: Fix distracting "TypeError" in example code (gh-116538)

diff --git a/Doc/library/dataclasses.rst b/Doc/library/dataclasses.rst
index 4ada69d63abada19a394b1b8d1d021873f6d9ac9..c612c138fc6ea8f342bf16ea5d010a3d12154a83 100644 (file)
--- a/Doc/library/dataclasses.rst
+++ b/Doc/library/dataclasses.rst
@@ -719,7 +719,7 @@ Using dataclasses, *if* this code was valid::
   class D:
       x: list = []      # This code raises ValueError
       def add(self, element):
-          self.x += element
+          self.x.append(element)
 
 it would generate code similar to::
 
@@ -728,7 +728,7 @@ it would generate code similar to::
       def __init__(self, x=x):
           self.x = x
       def add(self, element):
-          self.x += element
+          self.x.append(element)
 
   assert D().x is D().x