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[3.13] gh-112346: Always set OS byte to 255, simpler gzip.compress function. (GH-120486) (#120563)
gh-112346: Always set OS byte to 255, simpler gzip.compress function. (GH-120486)

This matches the output behavior in 3.10 and earlier; the optimization in 3.11 allowed the zlib library's "os" value to be filled in instead in the circumstance when mtime was 0.  this keeps things consistent.
(cherry picked from commit 08d09cf5ba)

Co-authored-by: Ruben Vorderman <r.h.p.vorderman@lumc.nl>
2024-06-15 19:10:50 +00:00
.azure-pipelines gh-109408: Move Windows builds from Azure Pipelines PR to GitHub Actions (#109569) 2023-09-20 12:56:42 -06:00
.devcontainer no-issue: devcontainer: update to Fedora 40 (gh-118161) 2024-04-24 20:13:35 +09:00
.github [3.13] gh-119146: Update ``regexp`` in `build.yml` to not trigger the jobs on `*.md` and `*.ini` files. (GH-120435) (#120447) 2024-06-13 12:03:59 +00:00
Android gh-116622: Android sysconfig updates (#118352) 2024-05-01 16:47:54 +00:00
Doc [3.13] gh-112346: Always set OS byte to 255, simpler gzip.compress function. (GH-120486) (#120563) 2024-06-15 19:10:50 +00:00
Grammar [3.13] gh-119724: Revert "bpo-45759: Better error messages for non-matching 'elif'/'else' statements (GH-29513)" (GH-119974) (GH-120013) 2024-06-04 08:36:16 +02:00
Include [3.13] gh-117657: Make PyType_HasFeature (exported version) atomic (GH-120484) (#120554) 2024-06-15 15:06:54 +00:00
Lib [3.13] gh-112346: Always set OS byte to 255, simpler gzip.compress function. (GH-120486) (#120563) 2024-06-15 19:10:50 +00:00
Mac Update macOS installer screens and README for 3.13.0b1 (GH-118685) 2024-05-07 00:49:07 -04:00
Misc [3.13] gh-112346: Always set OS byte to 255, simpler gzip.compress function. (GH-120486) (#120563) 2024-06-15 19:10:50 +00:00
Modules [3.13] gh-120161: Fix a Crash in the _datetime Module (gh-120518) 2024-06-14 19:54:46 +00:00
Objects [3.13] gh-117657: Make PyType_HasFeature (exported version) atomic (GH-120484) (#120554) 2024-06-15 15:06:54 +00:00
PC gh-119679: Fix layout of PYD and DLL files on Windows when using PC/layout script (GH-120133) 2024-06-06 15:38:31 +00:00
PCbuild gh-116145: Updated bundled Tcl/Tk on Windows to 8.6.14 (GH-117030) 2024-05-31 12:38:03 +00:00
Parser [3.13] gh-119724: Revert "bpo-45759: Better error messages for non-matching 'elif'/'else' statements (GH-29513)" (GH-119974) (GH-120013) 2024-06-04 08:36:16 +02:00
Programs [3.13] gh-93691: fix too broad source locations of for statement iterators (GH-120330) (#120399) 2024-06-12 12:18:43 +00:00
Python [3.13] gh-120526: Correct signature of map() builtin (GH-120528) (GH-120539) 2024-06-15 05:59:37 +00:00
Tools [3.13] gh-117657: Add TSAN suppression for set_default_allocator_unlocked (GH-120500) (#120510) 2024-06-14 16:34:07 +00:00
iOS gh-114099: Fix typos in iOS/README.rst (GH-118378) 2024-04-29 14:15:15 +03:00
.coveragerc gh-106368: Improve coverage reports for argument clinic (#107693) 2023-08-06 20:40:55 +01:00
.editorconfig gh-115317: Rewrite changelog filter to use vanilla JavaScript (#115324) 2024-02-12 22:17:33 +00:00
.gitattributes gh-107361: strengthen default SSL context flags (#112389) 2024-03-06 13:44:58 -08:00
.gitignore gh-114099 - Add iOS framework loading machinery. (GH-116454) 2024-03-19 08:36:19 -04:00
.mailmap Update name in acknowledgements and add mailmap (#103696) 2023-04-30 03:21:20 +00:00
.pre-commit-config.yaml GH-118487: Add Black to `.pre-commit-config.yaml` for JIT files (GH-118537) 2024-05-03 10:49:51 -07:00
.readthedocs.yml RtD docs previews: Cancel building PRs if no changes in Doc dir (#104100) 2023-05-24 16:54:15 +03:00
LICENSE Update copyright years to 2024. (GH-113608) 2024-01-16 21:54:05 +01:00
Makefile.pre.in [3.13] gh-106531: Apply changes from importlib_resources 6.3.2 (GH-117054) (#120014) 2024-06-04 10:54:59 -04:00
README.rst Python 3.13.0b2 2024-06-05 16:46:34 +02:00
aclocal.m4 gh-115765: Don't use deprecated AC_EGREP_* macros in configure.ac (#116016) 2024-02-28 14:35:41 +01:00
config.guess bpo-33393: Update config.guess and config.sub (GH-29781) 2021-11-25 20:55:29 +01:00
config.sub gh-114099: Add configure and Makefile targets to support iOS compilation. (GH-115390) 2024-02-25 20:21:10 -05:00
configure [3.13] gh-120400 :Support Linux perf profile to see Python calls on RISC-V architecture (GH-120089) (#120413) 2024-06-14 17:03:24 +02:00
configure.ac [3.13] gh-120400 :Support Linux perf profile to see Python calls on RISC-V architecture (GH-120089) (#120413) 2024-06-14 17:03:24 +02:00
install-sh Update CI files to account for the master -> main rename (GH-25860) 2021-05-03 23:36:55 +01:00
pyconfig.h.in gh-117845: Detect libedit hook function signature in configure (#117870) 2024-04-17 11:26:10 +02:00


This is Python version 3.13.0 beta 2

.. image:: https://github.com/python/cpython/workflows/Tests/badge.svg
   :alt: CPython build status on GitHub Actions
   :target: https://github.com/python/cpython/actions

.. image:: https://dev.azure.com/python/cpython/_apis/build/status/Azure%20Pipelines%20CI?branchName=main
   :alt: CPython build status on Azure DevOps
   :target: https://dev.azure.com/python/cpython/_build/latest?definitionId=4&branchName=main

.. image:: https://img.shields.io/badge/discourse-join_chat-brightgreen.svg
   :alt: Python Discourse chat
   :target: https://discuss.python.org/

Copyright © 2001-2024 Python Software Foundation.  All rights reserved.

See the end of this file for further copyright and license information.

.. contents::

General Information

- Website: https://www.python.org
- Source code: https://github.com/python/cpython
- Issue tracker: https://github.com/python/cpython/issues
- Documentation: https://docs.python.org
- Developer's Guide: https://devguide.python.org/

Contributing to CPython

For more complete instructions on contributing to CPython development,
see the `Developer Guide`_.

.. _Developer Guide: https://devguide.python.org/

Using Python

Installable Python kits, and information about using Python, are available at

.. _python.org: https://www.python.org/

Build Instructions

On Unix, Linux, BSD, macOS, and Cygwin::

    make test
    sudo make install

This will install Python as ``python3``.

You can pass many options to the configure script; run ``./configure --help``
to find out more.  On macOS case-insensitive file systems and on Cygwin,
the executable is called ``python.exe``; elsewhere it's just ``python``.

Building a complete Python installation requires the use of various
additional third-party libraries, depending on your build platform and
configure options.  Not all standard library modules are buildable or
useable on all platforms.  Refer to the
`Install dependencies <https://devguide.python.org/getting-started/setup-building.html#build-dependencies>`_
section of the `Developer Guide`_ for current detailed information on
dependencies for various Linux distributions and macOS.

On macOS, there are additional configure and build options related
to macOS framework and universal builds.  Refer to `Mac/README.rst

On Windows, see `PCbuild/readme.txt

To build Windows installer, see `Tools/msi/README.txt

If you wish, you can create a subdirectory and invoke configure from there.
For example::

    mkdir debug
    cd debug
    ../configure --with-pydebug
    make test

(This will fail if you *also* built at the top-level directory.  You should do
a ``make clean`` at the top-level first.)

To get an optimized build of Python, ``configure --enable-optimizations``
before you run ``make``.  This sets the default make targets up to enable
Profile Guided Optimization (PGO) and may be used to auto-enable Link Time
Optimization (LTO) on some platforms.  For more details, see the sections

Profile Guided Optimization

PGO takes advantage of recent versions of the GCC or Clang compilers.  If used,
either via ``configure --enable-optimizations`` or by manually running
``make profile-opt`` regardless of configure flags, the optimized build
process will perform the following steps:

The entire Python directory is cleaned of temporary files that may have
resulted from a previous compilation.

An instrumented version of the interpreter is built, using suitable compiler
flags for each flavor. Note that this is just an intermediary step.  The
binary resulting from this step is not good for real-life workloads as it has
profiling instructions embedded inside.

After the instrumented interpreter is built, the Makefile will run a training
workload.  This is necessary in order to profile the interpreter's execution.
Note also that any output, both stdout and stderr, that may appear at this step
is suppressed.

The final step is to build the actual interpreter, using the information
collected from the instrumented one.  The end result will be a Python binary
that is optimized; suitable for distribution or production installation.

Link Time Optimization

Enabled via configure's ``--with-lto`` flag.  LTO takes advantage of the
ability of recent compiler toolchains to optimize across the otherwise
arbitrary ``.o`` file boundary when building final executables or shared
libraries for additional performance gains.

What's New

We have a comprehensive overview of the changes in the `What's New in Python
3.13 <https://docs.python.org/3.13/whatsnew/3.13.html>`_ document.  For a more
detailed change log, read `Misc/NEWS
<https://github.com/python/cpython/tree/main/Misc/NEWS.d>`_, but a full
accounting of changes can only be gleaned from the `commit history

If you want to install multiple versions of Python, see the section below
entitled "Installing multiple versions".


`Documentation for Python 3.13 <https://docs.python.org/3.13/>`_ is online,
updated daily.

It can also be downloaded in many formats for faster access.  The documentation
is downloadable in HTML, PDF, and reStructuredText formats; the latter version
is primarily for documentation authors, translators, and people with special
formatting requirements.

For information about building Python's documentation, refer to `Doc/README.rst


To test the interpreter, type ``make test`` in the top-level directory.  The
test set produces some output.  You can generally ignore the messages about
skipped tests due to optional features which can't be imported.  If a message
is printed about a failed test or a traceback or core dump is produced,
something is wrong.

By default, tests are prevented from overusing resources like disk space and
memory.  To enable these tests, run ``make buildbottest``.

If any tests fail, you can re-run the failing test(s) in verbose mode.  For
example, if ``test_os`` and ``test_gdb`` failed, you can run::

    make test TESTOPTS="-v test_os test_gdb"

If the failure persists and appears to be a problem with Python rather than
your environment, you can `file a bug report
<https://github.com/python/cpython/issues>`_ and include relevant output from
that command to show the issue.

See `Running & Writing Tests <https://devguide.python.org/testing/run-write-tests.html>`_
for more on running tests.

Installing multiple versions

On Unix and Mac systems if you intend to install multiple versions of Python
using the same installation prefix (``--prefix`` argument to the configure
script) you must take care that your primary python executable is not
overwritten by the installation of a different version.  All files and
directories installed using ``make altinstall`` contain the major and minor
version and can thus live side-by-side.  ``make install`` also creates
``${prefix}/bin/python3`` which refers to ``${prefix}/bin/python3.X``.  If you
intend to install multiple versions using the same prefix you must decide which
version (if any) is your "primary" version.  Install that version using
``make install``.  Install all other versions using ``make altinstall``.

For example, if you want to install Python 2.7, 3.6, and 3.13 with 3.13 being the
primary version, you would execute ``make install`` in your 3.13 build directory
and ``make altinstall`` in the others.

Release Schedule

See :pep:`719` for Python 3.13 release details.

Copyright and License Information

Copyright © 2001-2024 Python Software Foundation.  All rights reserved.

Copyright © 2000 BeOpen.com.  All rights reserved.

Copyright © 1995-2001 Corporation for National Research Initiatives.  All
rights reserved.

Copyright © 1991-1995 Stichting Mathematisch Centrum.  All rights reserved.

See the `LICENSE <https://github.com/python/cpython/blob/main/LICENSE>`_ for
information on the history of this software, terms & conditions for usage, and a

This Python distribution contains *no* GNU General Public License (GPL) code,
so it may be used in proprietary projects.  There are interfaces to some GNU
code but these are entirely optional.

All trademarks referenced herein are property of their respective holders.