[3.10] bpo-43908: Add What's New entry for Py_TPFLAGS_IMMUTABLETYPE flag (GH-25816) by miss-islington · Pull Request #26115 · python/cpython

Expand Up @@ -1838,6 +1838,10 @@ New Features creating type instances. (Contributed by Victor Stinner in :issue:`43916`.)
* Add a new :c:data:`Py_TPFLAGS_IMMUTABLETYPE` type flag for creating immutable type objects: type attributes cannot be set nor deleted. (Contributed by Victor Stinner and Erlend E. Aasland in :issue:`43908`.)
Porting to Python 3.10 ----------------------
Expand Down Expand Up @@ -1895,6 +1899,12 @@ Porting to Python 3.10 been included directly, consider including ``Python.h`` instead. (Contributed by Nicholas Sim in :issue:`35134`)
* Use the :c:data:`Py_TPFLAGS_IMMUTABLETYPE` type flag to create immutable type objects. Do not rely on :c:data:`Py_TPFLAGS_HEAPTYPE` to decide if a type object is mutable or not; check if :c:data:`Py_TPFLAGS_IMMUTABLETYPE` is set instead. (Contributed by Victor Stinner and Erlend E. Aasland in :issue:`43908`.)
Deprecated ----------
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