bpo-41137: Reorganize What's New in Python 3.11 (GH-28518)

* Merge the two Removed sections.
* Move "Build Changes" at the end, before "C API Changes".
* Move the pdb change in Porting to Python 3.11.
* Move C API new features in their section.
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@ -250,6 +250,68 @@ unicodedata
* The Unicode database has been updated to version 14.0.0. (:issue:`45190`).
Optimizations
=============
* Compiler now optimizes simple C-style formatting with literal format
containing only format codes ``%s``, ``%r`` and ``%a`` and makes it as
fast as corresponding f-string expression.
(Contributed by Serhiy Storchaka in :issue:`28307`.)
* "Zero-cost" exceptions are implemented. The cost of ``try`` statements is
almost eliminated when no exception is raised.
(Contributed by Mark Shannon in :issue:`40222`.)
* Method calls with keywords are now faster due to bytecode
changes which avoid creating bound method instances. Previously, this
optimization was applied only to method calls with purely positional
arguments.
(Contributed by Ken Jin and Mark Shannon in :issue:`26110`, based on ideas
implemented in PyPy.)
* Pure ASCII strings are now normalized in constant time by :func:`unicodedata.normalize`.
(Contributed by Dong-hee Na in :issue:`44987`.)
CPython bytecode changes
========================
* Added a new :opcode:`CALL_METHOD_KW` opcode. Calls a method in a similar
fashion as :opcode:`CALL_METHOD`, but also supports keyword arguments. Works
in tandem with :opcode:`LOAD_METHOD`.
Deprecated
==========
* The :mod:`lib2to3` package is now deprecated and may not be able to parse
Python 3.10 or newer. See the :pep:`617` (New PEG parser for CPython).
(Contributed by Victor Stinner in :issue:`40360`.)
* :class:`webbrowser.MacOSX` is deprecated and will be removed in Python 3.13.
It is untested and undocumented and also not used by webbrowser itself.
(Contributed by Dong-hee Na in :issue:`42255`.)
* The behavior of returning a value from a :class:`~unittest.TestCase` and
:class:`~unittest.IsolatedAsyncioTestCase` test methods (other than the
default ``None`` value), is now deprecated.
* Deprecated the following :mod:`unittest` functions, scheduled for removal in
Python 3.13:
* :func:`unittest.findTestCases`
* :func:`unittest.makeSuite`
* :func:`unittest.getTestCaseNames`
Use :class:`~unittest.TestLoader` method instead:
* :meth:`unittest.TestLoader.loadTestsFromModule`
* :meth:`unittest.TestLoader.loadTestsFromTestCase`
* :meth:`unittest.TestLoader.getTestCaseNames`
(Contributed by Erlend E. Aasland in :issue:`5846`.)
Removed
=======
@ -323,81 +385,6 @@ Removed
deprecated since Python 3.2.
(Contributed by Hugo van Kemenade in :issue:`45173`.)
Optimizations
=============
* Compiler now optimizes simple C-style formatting with literal format
containing only format codes ``%s``, ``%r`` and ``%a`` and makes it as
fast as corresponding f-string expression.
(Contributed by Serhiy Storchaka in :issue:`28307`.)
* "Zero-cost" exceptions are implemented. The cost of ``try`` statements is
almost eliminated when no exception is raised.
(Contributed by Mark Shannon in :issue:`40222`.)
* Method calls with keywords are now faster due to bytecode
changes which avoid creating bound method instances. Previously, this
optimization was applied only to method calls with purely positional
arguments.
(Contributed by Ken Jin and Mark Shannon in :issue:`26110`, based on ideas
implemented in PyPy.)
* :file:`.pdbrc` is now read with ``'utf-8'`` encoding.
* Pure ASCII strings are now normalized in constant time by :func:`unicodedata.normalize`.
(Contributed by Dong-hee Na in :issue:`44987`.)
CPython bytecode changes
========================
* Added a new :opcode:`CALL_METHOD_KW` opcode. Calls a method in a similar
fashion as :opcode:`CALL_METHOD`, but also supports keyword arguments. Works
in tandem with :opcode:`LOAD_METHOD`.
Build Changes
=============
* CPython can now be built with the ThinLTO option via ``--with-lto=thin``.
(Contributed by Dong-hee Na and Brett Holman in :issue:`44340`.)
Deprecated
==========
* The :mod:`lib2to3` package is now deprecated and may not be able to parse
Python 3.10 or newer. See the :pep:`617` (New PEG parser for CPython).
(Contributed by Victor Stinner in :issue:`40360`.)
* :class:`webbrowser.MacOSX` is deprecated and will be removed in Python 3.13.
It is untested and undocumented and also not used by webbrowser itself.
(Contributed by Dong-hee Na in :issue:`42255`.)
* The behavior of returning a value from a :class:`~unittest.TestCase` and
:class:`~unittest.IsolatedAsyncioTestCase` test methods (other than the
default ``None`` value), is now deprecated.
* Deprecated the following :mod:`unittest` functions, scheduled for removal in
Python 3.13:
* :func:`unittest.findTestCases`
* :func:`unittest.makeSuite`
* :func:`unittest.getTestCaseNames`
Use :class:`~unittest.TestLoader` method instead:
* :meth:`unittest.TestLoader.loadTestsFromModule`
* :meth:`unittest.TestLoader.loadTestsFromTestCase`
* :meth:`unittest.TestLoader.getTestCaseNames`
(Contributed by Erlend E. Aasland in :issue:`5846`.)
Removed
=======
* The :func:`@asyncio.coroutine <asyncio.coroutine>` :term:`decorator` enabling
legacy generator-based coroutines to be compatible with async/await code.
The function has been deprecated since Python 3.8 and the removal was
@ -435,18 +422,30 @@ Changes in the Python API
how universal newlines works.
(Contributed by Victor Stinner in :issue:`37330`.)
* The :mod:`pdb` module now reads the :file:`.pdbrc` configuration file with
the ``'utf-8'`` encoding.
(Contributed by Srinivas Reddy Thatiparthy (శ్రీనివాస్ రెడ్డి తాటిపర్తి) in :issue:`41137`.)
Build Changes
=============
* CPython can now be built with the ThinLTO option via ``--with-lto=thin``.
(Contributed by Dong-hee Na and Brett Holman in :issue:`44340`.)
C API Changes
=============
New Features
------------
* Add a new :c:func:`PyType_GetName` function to get type's short name.
(Contributed by Hai Shi in :issue:`42035`.)
* Add a new :c:func:`PyType_GetQualName` function to get type's qualified name.
(Contributed by Hai Shi in :issue:`42035`.)
New Features
------------
Porting to Python 3.11
----------------------