[Python-checkins] [3.8] [3.9] bpo-41688: Document bug in **= dispatching in the language data… (GH-22172) (GH-22175)

Miss Islington (bot) webhook-mailer at python.org
Tue Sep 15 09:44:32 EDT 2020

commit: 4c4c354de2c9a290afbd4e5fcba07e3696ca0396
branch: 3.8
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: GitHub <noreply at github.com>
date: 2020-09-09T11:15:49-07:00

[3.8] [3.9] bpo-41688: Document bug in **= dispatching in the language data… (GH-22172) (GH-22175)

(cherry picked from commit 46bc21e1780016aaacd34e472f838dc792fb674c)

Co-authored-by: Ammar Askar <ammar at ammaraskar.com>

Automerge-Triggered-By: @brettcannon

M Doc/reference/datamodel.rst

diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index c1262cdb9c106..3f05385862416 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -2404,6 +2404,13 @@ left undefined.
    :ref:`faq-augmented-assignment-tuple-error`), but this behavior is in fact
    part of the data model.
+   .. note::
+      Due to a bug in the dispatching mechanism for ``**=``, a class that
+      defines :meth:`__ipow__` but returns ``NotImplemented`` would fail to
+      fall back to ``x.__pow__(y)`` and ``y.__rpow__(x)``. This bug is fixed
+      in Python 3.10.
 .. method:: object.__neg__(self)

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