[3.13] gh-124520: What's New entry for ctypes metaclass __new__/__ini…

…t__ change (GH-124546) (#124708) gh-124520: What's New entry for ctypes metaclass __new__/__init__ change (GH-124546) (cherry picked from commit 3387f76) Co-authored-by: Petr Viktorin <[email protected]>
python · Sep 27, 2024 · ec4d7b5 · ec4d7b5
1 parent 09aecb6
commit ec4d7b5
Showing 1 changed file with 18 additions and 0 deletions.
diff --git a/Doc/whatsnew/3.13.rst b/Doc/whatsnew/3.13.rst
@@ -824,6 +824,24 @@ copy
   (Contributed by Serhiy Storchaka in :gh:`108751`.)
 
 
+ctypes
+------
+
+* As a consequence of necessary internal refactoring, initialization of
+  internal metaclasses now happens in ``__init__`` rather
+  than in ``__new__``. This affects projects that subclass these internal
+  metaclasses to provide custom initialization.
+  Generally:
+
+  - Custom logic that was done in ``__new__`` after calling ``super().__new__``
+    should be moved to ``__init__``.
+  - To create a class, call the metaclass, not only the metaclass's
+    ``__new__`` method.
+
+  See :gh:`124520` for discussion and links to changes in some affected
+  projects.
+
+
 dbm
 ---