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[3.10] bpo-43908: Add What's New entry for Py_TPFLAGS_IMMUTABLETYPE flag (GH-25816) #26115

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May 13, 2021
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[3.10] bpo-43908: Add What's New entry for Py_TPFLAGS_IMMUTABLETYPE flag (GH-25816) #26115

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10 changes: 10 additions & 0 deletions Doc/whatsnew/3.10.rst
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Original file line number Diff line number Diff line change
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
----------

Expand Down