python-peps/pep-0569.rst

PEP: 569
Title: Python 3.8 Release Schedule
Version: $Revision$
Last-Modified: $Date$
Author: Łukasz Langa <lukasz@python.org>
Status: Active
Type: Informational
Content-Type: text/x-rst
Created: 27-Jan-2018
Python-Version: 3.8


Abstract
========

This document describes the development and release schedule for
Python 3.8.  The schedule primarily concerns itself with PEP-sized
items.

.. Small features may be added up to the first beta
   release.  Bugs may be fixed until the final release,
   which is planned for end of October 2019.


Release Manager and Crew
========================

- 3.8 Release Manager: Łukasz Langa
- Windows installers: Steve Dower
- Mac installers: Ned Deily
- Documentation: Julien Palard


3.8 Lifespan
============

3.8 will receive bugfix updates approximately every 1-3 months for
approximately 18 months.  After the release of 3.9.0 final, a final
3.8 bugfix update will be released.  After that, it is expected that
security updates (source only) will be released until 5 years after
the release of 3.8 final, so until approximately October 2024.


Release Schedule
================

3.8.0 schedule
--------------

Actual:

- 3.8 development begins: Monday, 2018-01-29
- 3.8.0 alpha 1: Sunday, 2019-02-03
- 3.8.0 alpha 2: Monday, 2019-02-25
- 3.8.0 alpha 3: Monday, 2019-03-25
- 3.8.0 alpha 4: Monday, 2019-05-06
- 3.8.0 beta 1: Tuesday, 2019-06-04
  (No new features beyond this point.)

Expected:

- 3.8.0 beta 2: Monday, 2019-07-01
- 3.8.0 beta 3: Monday, 2019-07-29
- 3.8.0 beta 4: Monday, 2019-08-26
- 3.8.0 candidate 1: Monday, 2019-09-30
- 3.8.0 candidate 2: Monday, 2019-10-07 (if necessary)
- 3.8.0 final: Monday, 2019-10-21

Subsequent bugfix releases at a monthly cadence.


Features for 3.8
================

Some of the notable features of Python 3.8 include:

* PEP 572, Assignment Expressions
* PEP 570, Positional-only arguments
* PEP 587, Python Initialization Configuration
* PEP 590, Vectorcall: a fast calling protocol for CPython
* Parallel filesystem cache for compiled bytecode
* Debug builds share ABI as release builds
* f-strings support a handy ``=`` specifier for debugging
* ``continue`` is now legal in ``finally:`` blocks
* on Windows, the default ``asyncio`` event loop is now
  ``ProactorEventLoop``
* on macOS, the *spawn* start method is now used by default in
  ``multiprocessing``
* ``multiprocessing`` can now use shared memory segments to avoid
  pickling costs between processes
* ``typed_ast`` is merged back to CPython
* ``LOAD_GLOBAL`` is now 40% faster
* ``pickle`` now uses Protocol 4 by default, improving performance

There are many other interesting changes, please consult the
"What's New" page in the documentation for a full list.


Copyright
=========

This document has been placed in the public domain.


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