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[3.12] GH-100425: Note improved commutativity in sum(). (GH-107785) by miss-islington · Pull Request #107787 · python/cpython · GitHub

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[3.12] GH-100425: Note improved commutativity in sum(). (GH-107785) #107787

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[3.12] GH-100425: Note improved commutativity in sum(). (GH-107785) #107787

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2 changes: 1 addition & 1 deletion Doc/library/functions.rst
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Expand Up @@ -1752,7 +1752,7 @@ are always available. They are listed here in alphabetical order.
The *start* parameter can be specified as a keyword argument.

.. versionchanged:: 3.12 Summation of floats switched to an algorithm
that gives higher accuracy on most builds.
that gives higher accuracy and better commutativity on most builds.


.. class:: super()
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4 changes: 2 additions & 2 deletions Doc/whatsnew/3.12.rst
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Expand Up @@ -505,8 +505,8 @@ Other Language Changes
* :class:`slice` objects are now hashable, allowing them to be used as dict keys and
set items. (Contributed by Will Bradshaw, Furkan Onder, and Raymond Hettinger in :gh:`101264`.)

* :func:`sum` now uses Neumaier summation to improve accuracy when summing
floats or mixed ints and floats.
* :func:`sum` now uses Neumaier summation to improve accuracy and commutativity
when summing floats or mixed ints and floats.
(Contributed by Raymond Hettinger in :gh:`100425`.)

* Exceptions raised in a typeobject's ``__set_name__`` method are no longer
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