bpo-45449: add note about PEP 585 in collections.abc's documentation (GH-29047)

Signed-off-by: Filipe Laíns <lains@riseup.net>
Co-authored-by: Łukasz Langa <lukasz@langa.pl>

diff --git a/Doc/library/collections.abc.rst b/Doc/library/collections.abc.rst
index 07df1873bba5884e33dd62b665b81dd3d964b1ec..132b0ce7192ac178d6e99851b61a7407945ea9d0 100644 (file)
--- a/Doc/library/collections.abc.rst
+++ b/Doc/library/collections.abc.rst
@@ -104,6 +104,9 @@ example, knowing that a class supplies ``__getitem__``, ``__len__``, and
 ``__iter__`` is insufficient for distinguishing a :class:`Sequence` from
 a :class:`Mapping`.
 
+.. versionadded:: 3.9
+   These abstract classes now support ``[]``. See :ref:`types-genericalias`
+   and :pep:`585`.
 
 .. _collections-abstract-base-classes:
 

diff --git a/Misc/NEWS.d/next/Documentation/2021-10-19-01-41-40.bpo-45449.fjHZJc.rst b/Misc/NEWS.d/next/Documentation/2021-10-19-01-41-40.bpo-45449.fjHZJc.rst
new file mode 100644 (file)
index 0000000..fb81775
--- /dev/null
+++ b/Misc/NEWS.d/next/Documentation/2021-10-19-01-41-40.bpo-45449.fjHZJc.rst
@@ -0,0 +1 @@
+Add note about :pep:`585` in :mod:`collections.abc`.