diff --git a/docs/source/cheat_sheet_py3.rst b/docs/source/cheat_sheet_py3.rst
index fe5761ca61871..7ae8eeb59d667 100644
--- a/docs/source/cheat_sheet_py3.rst
+++ b/docs/source/cheat_sheet_py3.rst
@@ -209,6 +209,7 @@ Classes
        # This will allow access to any A.x, if x is compatible with the return type
        def __getattr__(self, name: str) -> int: ...
 
+   a = A()
    a.foo = 42  # Works
    a.bar = 'Ex-parrot'  # Fails type checking