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[3.14] GH-123299: Copyedit 3.14 What's New: Trivia (GH-139618) #139626

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[3.14] GH-123299: Copyedit 3.14 What's New: Trivia (GH-139618) #139626

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56 changes: 34 additions & 22 deletions Doc/whatsnew/3.14.rst
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****************************
What's new in Python 3.14
****************************

:Editor: Hugo van Kemenade
:Editors: Adam Turner and Hugo van Kemenade

.. Rules for maintenance:
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when researching a change.
This article explains the new features in Python 3.14, compared to 3.13.

Python 3.14 will be released on 7 October 2025.
For full details, see the :ref:`changelog <changelog>`.

.. seealso::

:pep:`745` -- Python 3.14 release schedule

.. note::

Prerelease users should be aware that this document is currently in draft
form. It will be updated substantially as Python 3.14 moves towards release,
so it's worth checking back even after reading earlier versions.


Summary -- release highlights
Summary -- Release highlights
=============================

.. This section singles out the most important changes in Python 3.14.
Brevity is key.
Python 3.14 will be the latest stable release of the Python
programming language, with a mix of changes to the language, the
implementation and the standard library.

The biggest changes to the implementation include template strings (:pep:`750`),
deferred evaluation of annotations (:pep:`649`),
and a new type of interpreter that uses tail calls.

The library changes include the addition of a new :mod:`!annotationlib` module
for introspecting and wrapping annotations (:pep:`749`),
a new :mod:`!compression.zstd` module for Zstandard support (:pep:`784`),
plus syntax highlighting in the REPL,
Python 3.14 will be the latest stable release of the Python programming
language, with a mix of changes to the language, the implementation,
and the standard library.
The biggest changes include :ref:`template string literals
<whatsnew314-template-string-literals>`,
:ref:`deferred evaluation of annotations <whatsnew314-deferred-annotations>`,
and support for :ref:`subinterpreters <whatsnew314-multiple-interpreters>` in
the standard library.

The library changes include significantly improved capabilities for
:ref:`introspection in asyncio <whatsnew314-asyncio-introspection>`,
:ref:`support for Zstandard <whatsnew314-zstandard>` via a new
:mod:`compression.zstd` module, syntax highlighting in the REPL,
as well as the usual deprecations and removals,
and improvements in user-friendliness and correctness.

This article doesn't attempt to provide a complete specification
of all new features, but instead gives a convenient overview.
For full details refer to the documentation,
such as the :ref:`Library Reference <library-index>`
and :ref:`Language Reference <reference-index>`.
To understand the complete implementation and design rationale for a change,
refer to the PEP for a particular new feature;
but note that PEPs usually are not kept up-to-date
once a feature has been fully implemented.
See `Porting to Python 3.14`_ for guidance on upgrading from
earlier versions of Python.

--------------

.. PEP-sized items next.
Expand All @@ -100,6 +108,7 @@ Interpreter improvements:
* :ref:`A new type of interpreter <whatsnew314-tail-call-interpreter>`
* :ref:`Free-threaded mode improvements <whatsnew314-free-threaded-cpython>`
* :ref:`Improved error messages <whatsnew314-improved-error-messages>`
* :ref:`Incremental garbage collection <whatsnew314-incremental-gc>`

Significant improvements in the standard library:

Expand All @@ -124,7 +133,8 @@ Release changes:

* :pep:`779`: :ref:`Free-threaded Python is officially supported
<whatsnew314-free-threaded-now-supported>`
* :pep:`761`: :ref:`Discontinuation of PGP signatures <whatsnew314-no-more-pgp>`
* :pep:`761`: :ref:`PGP signatures have been discontinued for official releases
<whatsnew314-no-more-pgp>`
* :ref:`Windows and macOS binary releases now support the experimental
just-in-time compiler <whatsnew314-jit-compiler>`
* :ref:`Binary releases for Android are now provided <whatsnew314-build-changes>`
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blocking_code()
runner.run(operation_two())
email
-----

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* Add the :opcode:`POP_ITER` opcode to support 'virtual' iterators.
(Contributed by Mark Shannon in :gh:`132554`.)


Pseudo-instructions
-------------------

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