gh-115775: Add whatsnew entry about __static_attributes__

Doc/reference/datamodel.rst

@@ -970,6 +970,7 @@
    single: __doc__ (class attribute)
    single: __annotations__ (class attribute)
    single: __type_params__ (class attribute)
+   single: __static_attributes__ (class attribute)
 
 Special attributes:
 
@@ -1000,6 +1001,10 @@
       A tuple containing the :ref:`type parameters <type-params>` of
       a :ref:`generic class <generic-classes>`.
 
+   :attr:`__static_attributes__`
+      A tuple containing names of attributes of this class which are accessed
+      through ``self.X`` from any function in its body.
+
 
 Class instances
 ---------------

Doc/whatsnew/3.13.rst

@@ -115,6 +115,11 @@ Improved Error Messages
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
     TypeError: split() got an unexpected keyword argument 'max_split'. Did you mean 'maxsplit'?
 
+* Classes have a new ``__static_attributes__`` attribute, populated by the compiler,
+  with a tuple of names of attributes of this class which are accessed
+  through ``self.X`` from any function in its body. (Contributed by Irit Katriel
+  in :gh:`115775`.)
+
 Incremental Garbage Collection
 ------------------------------