Python Insider

Python 3.13.0 alpha 2 is now available

2023-11-22T19:46:00.000-05:00

Well, well, well, it’s time for Python 3.13.0 alpha 2!

https://www.python.org/downloads/release/python-3130a2/

This is an early developer preview of Python 3.13

Major new features of the 3.13 series, compared to 3.12

Python 3.13 is still in development. This release, 3.13.0a2 is the second of seven planned alpha releases.

Alpha releases are intended to make it easier to test the current state of new features and bug fixes and to test the release process.

During the alpha phase, features may be added up until the start of the beta phase (2024-05-07) and, if necessary, may be modified or deleted up until the release candidate phase (2024-07-30). Please keep in mind that this is a preview release and its use is not recommended for production environments.

Many new features for Python 3.13 are still being planned and written. The most notable change so far:

PEP 594 (Removing dead batteries from the standard library) scheduled removals of many deprecated modules: aifc, audioop, chunk, cgi, cgitb, crypt, imghdr, mailcap, msilib, nis, nntplib, ossaudiodev, pipes, sndhdr, spwd, sunau, telnetlib, uu, xdrlib, lib2to3.
Many other removals of deprecated classes, functions and methods in various standard library modules.
New deprecations, most of which are scheduled for removal from Python 3.15 or 3.16.
C API removals and deprecations. (Some removals present in alpha 1 have been reverted in alpha 2, as the removals were deemed too disruptive at this time.)

(Hey, fellow core developer, if a feature you find important is missing from this list, let Thomas know.)

The next pre-release of Python 3.13 will be 3.13.0a3, currently scheduled for 2023-12-19.

More resources

Online Documentation
PEP 719, 3.13 Release Schedule
Report bugs at https://github.com/python/cpython/issues.
Help fund Python and its community.

Enjoy the new releases

Thanks to all of the many volunteers who help make Python Development and these releases possible! Please consider supporting our efforts by volunteering yourself or through organization contributions to the Python Software Foundation.

Regards from lovely Czechia,

Your release team,
Thomas Wouters
Ned Deily
Steve Dower
Łukasz Langa

Python 3.13.0 alpha 1 is now available

2023-10-13T08:31:00.005-04:00

It’s not a very exciting release (yet), but it’s time for the first alpha of Python 3.13 anyway!

https://www.python.org/downloads/release/python-3130a1/

This is an early developer preview of Python 3.13

Major new features of the 3.13 series, compared to 3.12

Python 3.13 is still in development. This release, 3.13.0a1 is the first of seven planned alpha releases.

Alpha releases are intended to make it easier to test the current state of new features and bug fixes and to test the release process.

During the alpha phase, features may be added up until the start of the beta phase (2024-05-07) and, if necessary, may be modified or deleted up until the release candidate phase (2024-07-30). Please keep in mind that this is a preview release and its use is not recommended for production environments.

Many new features for Python 3.13 are still being planned and written. The most notable change so far are new deprecations, most of which are scheduled for removal from Python 3.15 or 3.16

(Hey, fellow core developer, if a feature you find important is missing from this list, let Thomas know.)

The next pre-release of Python 3.13 will be 3.13.0a2, currently scheduled for 2023-11-21.

More resources

Online Documentation
PEP 719, 3.13 Release Schedule
Report bugs at https://github.com/python/cpython/issues.
Help fund Python and its community.

Enjoy the new releases

Regards from lovely Czechia,

Your release team,
Thomas Wouters
Ned Deily
Steve Dower
Łukasz Langa

Python 3.11.6 is now available

2023-10-02T13:20:00.003-04:00

This is the sixth maintenance release of Python 3.11

Python 3.11.6 is the newest major release of the Python programming language, and it contains many new features and optimizations. Get it here:

https://www.python.org/downloads/release/python-3116/

Major new features of the 3.11 series, compared to 3.10

Among the new major new features and changes so far:

PEP 657 – Include Fine-Grained Error Locations in Tracebacks
PEP 654 – Exception Groups and except*
PEP 673 – Self Type
PEP 646 – Variadic Generics
PEP 680 – tomllib: Support for Parsing TOML in the Standard Library
PEP 675 – Arbitrary Literal String Type
PEP 655 – Marking individual TypedDict items as required or potentially-missing
bpo-46752 – Introduce task groups to asyncio
PEP 681 – Data Class Transforms
bpo-433030– Atomic grouping ((?>…)) and possessive quantifiers (*+, ++, ?+, {m,n}+) are now supported in regular expressions.
The Faster Cpython Project is already yielding some exciting results. Python 3.11 is up to 10-60% faster than Python 3.10. On average, we measured a 1.22x speedup on the standard benchmark suite. See Faster CPython for details.

More resources

Online Documentation

PEP 664, 3.11 Release Schedule
Report bugs at https://bugs.python.org.

Help fund Python and its community.

And now for something completely different

A g-factor (also called g value) is a dimensionless quantity that characterizes the magnetic moment and angular momentum of an atom, a particle or the nucleus. It is essentially a proportionality constant that relates the different observed magnetic moments μ of a particle to their angular momentum quantum numbers and a unit of magnetic moment (to make it dimensionless), usually the Bohr magneton or nuclear magneton. Its value is proportional to the gyromagnetic ratio.

We hope you enjoy the new releases!

https://www.python.org/psf/

Your friendly release team,
Ned Deily @nad
Steve Dower @steve.dower
Pablo Galindo Salgado @pablogsal

Python 3.12.0 (final) now available

2023-10-02T12:00:00.000-04:00

Finally, it’s final! The final release of Python 3.12.0 (final) is here!

https://www.python.org/downloads/release/python-3120/

This is the stable release of Python 3.12.0

Python 3.12.0 is the newest major release of the Python programming language, and it contains many new features and optimizations.

Major new features of the 3.12 series, compared to 3.11

New features

More flexible f-string parsing , allowing many things previously disallowed (PEP 701).
Support for the buffer protocol in Python code (PEP 688).
A new debugging/profiling API (PEP 669).
Support for isolated subinterpreters with separate Global Interpreter Locks (PEP 684).
Even more improved error messages. More exceptions potentially caused by typos now make suggestions to the user.
Support for the Linux perf profiler to report Python function names in traces.
Many large and small performance improvements (like PEP 709 and support for the BOLT binary optimizer), delivering an estimated 5% overall performance improvement.

Type annotations

New type annotation syntax for generic classes (PEP 695).
New override decorator for methods (PEP 698).

Deprecations

The deprecated wstr and wstr_length members of the C implementation of unicode objects were removed, per PEP 623.
In the unittest module, a number of long deprecated methods and classes were removed. (They had been deprecated since Python 3.1 or 3.2).
The deprecated smtpd and distutils modules have been removed (see PEP 594 and PEP 632. The setuptools package continues to provide the distutils module.
A number of other old, broken and deprecated functions, classes and methods have been removed.
Invalid backslash escape sequences in strings now warn with SyntaxWarning instead of DeprecationWarning, making them more visible. (They will become syntax errors in the future.)
The internal representation of integers has changed in preparation for performance enhancements. (This should not affect most users as it is an internal detail, but it may cause problems for Cython-generated code.)

For more details on the changes to Python 3.12, see What’s new in Python 3.12.

More resources

Online Documentation.
PEP 693, the Python 3.12 Release Schedule.
Report bugs via GitHub Issues.
Help fund Python and its community.

And now for something completely different

They have no need of our help
So do not tell me
These haggard faces could belong to you or me
Should life have dealt a different hand
We need to see them for who they really are
Chancers and scroungers
Layabouts and loungers
With bombs up their sleeves
Cut-throats and thieves
They are not
Welcome here
We should make them
Go back to where they came from
They cannot
Share our food
Share our homes
Share our countries
Instead let us
Build a wall to keep them out
It is not okay to say
These are people just like us
A place should only belong to those who are born there
Do not be so stupid to think that
The world can be looked at another way

(now read from bottom to top)

Refugees, by Brian Bilston.

We hope you enjoy the new releases!

Your release team,
Thomas Wouters
Ned Deily
Steve Dower
Łukasz Langa

Python 3.12.0 release candidate 3 now available

2023-09-19T07:21:00.000-04:00

I'm pleased to announce the release of Python 3.12 release candidate 3.

https://www.python.org/downloads/release/python-3120rc3/

This is the second release candidate of Python 3.12.0

This release, 3.12.0rc3, is the absolutely last release preview for Python 3.12.

There will be no ABI changes from this point forward in the 3.12 series. The intent is for the final release of 3.12.0, scheduled for Monday, 2023-10-02, to be identical to this release candidate. This really is the last chance to find critical problems in Python 3.12.

Call to action

We strongly encourage maintainers of third-party Python projects to prepare their projects for 3.12 compatibilities during this phase, and where necessary publish Python 3.12 wheels on PyPI to be ready for the final release of 3.12.0. Any binary wheels built against Python 3.12.0rc3 will work with future versions of Python 3.12. As always, report any issues to the Python bug tracker.

Please keep in mind that this is a preview release and while it’s as close to the final release as we can get it, its use is not recommended for production environments.

Core developers: time to work on documentation now

Are all your changes properly documented?
Are they mentioned in What’s New?
Did you notice other changes you know of to have insufficient documentation?

Major new features of the 3.12 series, compared to 3.11

New features

More flexible f-string parsing, allowing many things previously disallowed (PEP 701).
Support for the buffer protocol in Python code (PEP 688).
A new debugging/profiling API (PEP 669).
Support for isolated subinterpreters with separate Global Interpreter Locks (PEP 684).
Even more improved error messages. More exceptions potentially caused by typos now make suggestions to the user.
Support for the Linux perf profiler to report Python function names in traces.
Many large and small performance improvements (like PEP 709 and support for the BOLT binary optimizer), delivering an estimated 5% overall performance improvement^{citation needed}.

Type annotations

New type annotation syntax for generic classes (PEP 695).
New override decorator for methods (PEP 698).

Deprecations

The deprecated wstr and wstr_length members of the C implementation of unicode objects were removed, per PEP 623.
In the unittest module, a number of long deprecated methods and classes were removed. (They had been deprecated since Python 3.1 or 3.2).
The deprecated smtpd and distutils modules have been removed (see PEP 594 and PEP 632. The setuptools package continues to provide the distutils module.
A number of other old, broken and deprecated functions, classes and methods have been removed.
Invalid backslash escape sequences in strings now warn with SyntaxWarning instead of DeprecationWarning, making them more visible. (They will become syntax errors in the future.)
The internal representation of integers has changed in preparation for performance enhancements. (This should not affect most users as it is an internal detail, but it may cause problems for Cython-generated code.)

(Hey, fellow core developer, if a feature you find important is missing from this list, let Thomas know.)

For more details on the changes to Python 3.12, see What’s new in Python 3.12. The next scheduled release of Python 3.12 will be 3.12.0, the final release, currently scheduled for 2023-10-02.

More resources

Online Documentation.
PEP 693, the Python 3.12 Release Schedule.
Report bugs via GitHub Issues.
Help fund Python and its community.

Enjoy the new release

Your release team,

Thomas Wouters

Ned Deily

Steve Dower

Łukasz Langa

Python 3.12.0 release candidate 2 now available

2023-09-06T07:05:00.000-04:00

I'm pleased to announce the release of Python 3.12 release candidate 2.

https://www.python.org/downloads/release/python-3120rc2/

This is the second release candidate of Python 3.12.0

This release, 3.12.0rc2, is the last release preview for Python 3.12.

There will be no ABI changes from this point forward in the 3.12 series. The intent is for the final release of 3.12.0, scheduled for Monday, 2023-10-02, to be identical to this release candidate. This is the last chance to find critical problems in Python 3.12.

Call to action

We strongly encourage maintainers of third-party Python projects to prepare their projects for 3.12 compatibilities during this phase, and where necessary publish Python 3.12 wheels on PyPI to be ready for the final release of 3.12.0. Any binary wheels built against Python 3.12.0rc2 will work with future versions of Python 3.12. As always, report any issues to the Python bug tracker.

Please keep in mind that this is a preview release and while it’s as close to the final release as we can get it, its use is not recommended for production environments.

Core developers: time to work on documentation now

Are all your changes properly documented?
Are they mentioned in What’s New?
Did you notice other changes you know of to have insufficient documentation?

Major new features of the 3.12 series, compared to 3.11

New features

More flexible f-string parsing, allowing many things previously disallowed (PEP 701).
Support for the buffer protocol in Python code (PEP 688).
A new debugging/profiling API (PEP 669).
Support for isolated subinterpreters with separate Global Interpreter Locks (PEP 684).
Even more improved error messages. More exceptions potentially caused by typos now make suggestions to the user.
Support for the Linux perf profiler to report Python function names in traces.
Many large and small performance improvements (like PEP 709), delivering an estimated 5% overall performance improvement^{citation needed}.

Type annotations

New type annotation syntax for generic classes (PEP 695).
New override decorator for methods (PEP 698).

Deprecations

The deprecated wstr and wstr_length members of the C implementation of unicode objects were removed, per PEP 623.
In the unittest module, a number of long deprecated methods and classes were removed. (They had been deprecated since Python 3.1 or 3.2).
The deprecated smtpd and distutils modules have been removed (see PEP 594 and PEP 632. The setuptools package continues to provide the distutils module.
A number of other old, broken and deprecated functions, classes and methods have been removed.
Invalid backslash escape sequences in strings now warn with SyntaxWarning instead of DeprecationWarning, making them more visible. (They will become syntax errors in the future.)
The internal representation of integers has changed in preparation for performance enhancements. (This should not affect most users as it is an internal detail, but it may cause problems for Cython-generated code.)

(Hey, fellow core developer, if a feature you find important is missing from this list, let Thomas know.)

For more details on the changes to Python 3.12, see What’s new in Python 3.12. The next scheduled release of Python 3.12 will be 3.12.0, the final release, currently scheduled for 2023-10-02.

More resources

Online Documentation.
PEP 693, the Python 3.12 Release Schedule.
Report bugs via GitHub Issues.
Help fund Python and its community.

Enjoy the new release

Your release team,

Thomas Wouters

Ned Deily

Steve Dower

Łukasz Langa

Python 3.11.5, 3.10.13, 3.9.18, and 3.8.18 is now available

2023-08-24T16:56:00.003-04:00

There’s security content in the releases, let’s dive right in.

gh-108310: Fixed an issue where instances of ssl.SSLSocket were vulnerable to a bypass of the TLS handshake and included protections (like certificate verification) and treating sent unencrypted data as if it were post-handshake TLS encrypted data. Security issue reported as CVE-2023-40217 1 by Aapo Oksman. Patch by Gregory P. Smith.

Upgrading is highly recommended to all users of affected versions.

Python 3.11.5

Get it here: https://www.python.org/downloads/release/python-3115/

This release was held up somewhat by the resolution of this CVE, which is why it includes a whopping 328 new commits since 3.11.4 (compared to 238 commits between 3.10.4 and 3.10.5). Among those, there is a fix for CVE-2023-41105 which affected Python 3.11.0 - 3.11.4. See gh-106242 for details.

There are also some fixes for crashes, check out the change log to see all information.

Most importantly, the release notes on the downloads page include a description of the Larmor precession. I understood some of the words there!

Python 3.10.13

Get it here: https://www.python.org/downloads/release/python-31013/

16 commits.

Python 3.9.18

Get it here: https://www.python.org/downloads/release/python-3918/

11 commits.

Python 3.8.18

Get it here: https://www.python.org/downloads/release/python-3818/

9 commits.

Stay safe and upgrade!

–
Łukasz Langa @ambv
on behalf of your friendly release team,

Ned Deily @nad
Steve Dower @steve.dower
Pablo Galindo Salgado @pablogsal
Łukasz Langa @ambv
Thomas Wouters @thomas

Python 3.12.0 release candidate 1 released

2023-08-06T09:11:00.000-04:00

I'm pleased to announce the release of Python 3.12 release candidate 1.

https://www.python.org/downloads/release/python-3120rc1/

This is the first release candidate of Python 3.12.0

This release, 3.12.0rc1, is the penultimate release preview. Entering the release candidate phase, only reviewed code changes which are clear bug fixes are allowed between this release candidate and the final release. The second candidate (and the last planned release preview) is scheduled for Monday, 2023-09-04, while the official release of 3.12.0 is scheduled for Monday, 2023-10-02.

There will be no ABI changes from this point forward in the 3.12 series, and the goal is that there will be as few code changes as possible.

Call to action

We strongly encourage maintainers of third-party Python projects to prepare their projects for 3.12 compatibilities during this phase, and where necessary publish Python 3.12 wheels on PyPI to be ready for the final release of 3.12.0. Any binary wheels built against Python 3.12.0rc1 will work with future versions of Python 3.12. As always, report any issues to the Python bug tracker.

Please keep in mind that this is a preview release and while it’s as close to the final release as we can get it, its use is not recommended for production environments.

Core developers: time to work on documentation now

Are all your changes properly documented?
Are they mentioned in What’s New?
Did you notice other changes you know of to have insufficient documentation?

Major new features of the 3.12 series, compared to 3.11

New features

More flexible f-string parsing, allowing many things previously disallowed (PEP 701).
Support for the buffer protocol in Python code (PEP 688).
A new debugging/profiling API (PEP 669).
Support for isolated subinterpreters with separate Global Interpreter Locks (PEP 684).
Even more improved error messages. More exceptions potentially caused by typos now make suggestions to the user.
Support for the Linux perf profiler to report Python function names in traces.
Many large and small performance improvements (like PEP 709), delivering an estimated 5% overall performance improvement^{citation needed}.

Type annotations

New type annotation syntax for generic classes (PEP 695).
New override decorator for methods (PEP 698).

Deprecations

The deprecated wstr and wstr_length members of the C implementation of unicode objects were removed, per PEP 623.
In the unittest module, a number of long deprecated methods and classes were removed. (They had been deprecated since Python 3.1 or 3.2).
The deprecated smtpd and distutils modules have been removed (see PEP 594 and PEP 632. The setuptools package continues to provide the distutils module.
A number of other old, broken and deprecated functions, classes and methods have been removed.
Invalid backslash escape sequences in strings now warn with SyntaxWarning instead of DeprecationWarning, making them more visible. (They will become syntax errors in the future.)
The internal representation of integers has changed in preparation for performance enhancements. (This should not affect most users as it is an internal detail, but it may cause problems for Cython-generated code.)

(Hey, fellow core developer, if a feature you find important is missing from this list, let Thomas know.)

For more details on the changes to Python 3.12, see What’s new in Python 3.12. The next pre-release of Python 3.12 will be 3.12.0rc2, the final release candidate, currently scheduled for 2023-09-04.

More resources

Online Documentation.
PEP 693, the Python 3.12 Release Schedule.
Report bugs via GitHub Issues.
Help fund Python and its community.

Enjoy the new release

Your release team,

Thomas Wouters

Ned Deily

Steve Dower

Łukasz Langa

Python 3.12.0 beta 4 released

2023-07-11T16:08:00.003-04:00

I'm pleased to announce the release of Python 3.12 beta 4.

https://www.python.org/downloads/release/python-3120b4/

This is a beta preview of Python 3.12

Python 3.12 is still in development. This release, 3.12.0b4, is the final of four beta release previews of 3.12.

Beta release previews are intended to give the wider community the opportunity to test new features and bug fixes and to prepare their projects to support the new feature release.

We strongly encourage maintainers of third-party Python projects to test with 3.12 during the beta phase and report issues found to [the Python bug tracker (https://github.com/python/cpython/issues) as soon as possible. While the release is planned to be feature complete entering the beta phase, it is possible that features may be modified or, in rare cases, deleted up until the start of the release candidate phase (Monday, 2023-07-31). Our goal is to have no ABI changes after this release, and as few code changes as possible after 3.12.0rc1, the first release candidate. To achieve that, it will be extremely important to get as much exposure for 3.12 as possible during the beta phase.

Please keep in mind that this is a preview release and its use is not recommended for production environments.

Major new features of the 3.12 series, compared to 3.11

Some of the new major new features and changes in Python 3.12 are:

New type annotation syntax for generic classes (PEP 695).
More flexible f-string parsing, allowing many things previously disallowed (PEP 701).
Support for the buffer protocol in Python code (PEP 688).
Even more improved error messages. More exceptions potentially caused by typos now make suggestions to the user.
Many large and small performance improvements (like PEP 709).
Support for the Linux perf profiler to report Python function names in traces.
The deprecated wstr and wstr_length members of the C implementation of unicode objects were removed, per PEP 623.
In the unittest module, a number of long deprecated methods and classes were removed. (They had been deprecated since Python 3.1 or 3.2).
The deprecated smtpd and distutils modules have been removed (see PEP 594 and PEP 632. The setuptools package continues to provide the distutils module.
A number of other old, broken and deprecated functions, classes and methods have been removed.
Invalid backslash escape sequences in strings now warn with SyntaxWarning instead of DeprecationWarning, making them more visible. (They will become syntax errors in the future.)
The internal representation of integers has changed in preparation for performance enhancements. (This should not affect most users as it is an internal detail, but it may cause problems for Cython-generated code.)
(Hey, fellow core developer, if a feature you find important is missing from this list, let Thomas know.)

For more details on the changes to Python 3.12, see What’s new in Python 3.12. The next pre-release of Python 3.12 will be 3.12.0rc1, the first release candidate, currently scheduled for 2023-07-31.

More resources

Online Documentation.

PEP 693, the Python 3.12 Release Schedule.

Report bugs via GitHub Issues.

Help fund Python and its community.

Enjoy the new release

Your release team,

Thomas Wouters

Ned Deily

Steve Dower

Łukasz Langa

Python 3.12.0 beta 3 released

2023-06-20T14:52:00.000-04:00

I'm pleased to announce the release of Python 3.12 beta 3.

https://www.python.org/downloads/release/python-3120b3/

This is a beta preview of Python 3.12

Python 3.12 is still in development. This release, 3.12.0b3, is the third of four planned beta release previews of 3.12.

Beta release previews are intended to give the wider community the opportunity to test new features and bug fixes and to prepare their projects to support the new feature release.

We strongly encourage maintainers of third-party Python projects to test with 3.12 during the beta phase and report issues found to [the Python bug tracker (https://github.com/python/cpython/issues) as soon as possible. While the release is planned to be feature complete entering the beta phase, it is possible that features may be modified or, in rare cases, deleted up until the start of the release candidate phase (Monday, 2023-07-31). Our goal is to have no ABI changes after beta 4 and as few code changes as possible after 3.12.0rc1, the first release candidate. To achieve that, it will be extremely important to get as much exposure for 3.12 as possible during the beta phase.

Please keep in mind that this is a preview release and its use is not recommended for production environments.

Major new features of the 3.12 series, compared to 3.11

Some of the new major new features and changes in Python 3.12 are:

New type annotation syntax for generic classes (PEP 695).
More flexible f-string parsing, allowing many things previously disallowed (PEP 701).
Even more improved error messages. More exceptions potentially caused by typos now make suggestions to the user.
Many large and small performance improvements (like PEP 709).
Support for the Linux perf profiler to report Python function names in traces.
The deprecated wstr and wstr_length members of the C implementation of unicode objects were removed, per PEP 623.
In the unittest module, a number of long deprecated methods and classes were removed. (They had been deprecated since Python 3.1 or 3.2).
The deprecated smtpd and distutils modules have been removed (see PEP 594 and PEP 632. The setuptools package continues to provide the distutils module.
A number of other old, broken and deprecated functions, classes and methods have been removed.
Invalid backslash escape sequences in strings now warn with SyntaxWarning instead of DeprecationWarning, making them more visible. (They will become syntax errors in the future.)
The internal representation of integers has changed in preparation for performance enhancements. (This should not affect most users as it is an internal detail, but it may cause problems for Cython-generated code.)
(Hey, fellow core developer, if a feature you find important is missing from this list, let Thomas know.)

For more details on the changes to Python 3.12, see What’s new in Python 3.12. The next pre-release of Python 3.12 will be 3.12.0b4, the last beta release, currently scheduled for 2023-07-10.

More resources

Online Documentation.

PEP 693, the Python 3.12 Release Schedule.

Report bugs via GitHub Issues.

Help fund Python and its community.

Enjoy the new release

Your release team,

Thomas Wouters

Ned Deily

Steve Dower

Łukasz Langa

Python 3.11.4, 3.10.12, 3.9.17, 3.8.17, 3.7.17, and 3.12.0 beta 2 are now available

2023-06-07T02:56:00.001-04:00

Greetings! Time for another combined release of six separate versions of Python!

Before you scroll away to the download links

Please test the 3.12 beta! Downloading it and trying it out helps us a lot in ensuring Python 3.12.0 will be as polished as possible.

We welcome 3.10 to the prestigious club of security-only releases. It’s officially an old version of Python now! If you haven’t rewritten all your if:elif:else:s with pattern matching yet, are you even still writing Python?

At the same time, it looks like 3.7 is reaching end-of-life. Unless another security release happens in June, 3.7.17 will be the final release of Python 3.7. I mean, now that I typed it out for all you to read, I’m sure I jinxed it. But in case I didn’t, I would like to thank Ned Deily for serving as the release manager of Python 3.6 and Python 3.7. He was my mentor as Release Manager, and continues serving Python as the provider of Mac installers for new releases. Thank you, Ned!

Speaking of installers, Steve Dower used to be the sole provider of Windows installers for Python releases for years now. His secret was a well-automated Azure pipeline that let him build, sign, and publish releases with minimal manual effort. Now he extended the power to press the blue “Run pipeline” button to more members of the team. Thank you, Steve! This is an important bus factor increment. In fact, the Windows installers for both 3.12.0b2 and 3.11.4 were ~~made by me~~ initiated by me. If there’s anything wrong with them, well, I guess that means I pressed the button wrong.

Security fixes in today’s releases

Updating is recommended due to security content:

3.7 - 3.12: gh-103142: The version of OpenSSL used in Windows and Mac installers has been upgraded to 1.1.1u to address CVE-2023-2650, CVE-2023-0465, CVE-2023-0466, CVE-2023-0464, as well as CVE-2023-0286, CVE-2022-4303, and CVE-2022-4303 fixed previously in 1.1.1t (gh-101727).
3.7 - 3.11: gh-102153: urllib.parse.urlsplit() now strips leading C0 control and space characters following the specification for URLs defined by WHATWG in response to CVE-2023-24329.
3.7 - 3.11: gh-99889: Fixed a security in flaw in uu.decode() that could allow for directory traversal based on the input if no out_file was specified.
3.7 - 3.11: gh-104049: Do not expose the local on-disk location in directory indexes produced by http.client.SimpleHTTPRequestHandler.
3.7 - 3.11: gh-101283: subprocess.Popen now uses a safer approach to find cmd.exe when launching with shell=True.
3.8 - 3.11: gh-103935: trace.__main__ now uses io.open_code() for files to be executed instead of raw open().
3.8 - 3.11: gh-102953: The extraction methods in tarfile, and shutil.unpack_archive(), have a new filter argument that allows limiting tar features than may be surprising or dangerous, such as creating files outside the destination directory. See Extraction filters for details.
3.9: gh-102126: Fixed a deadlock at shutdown when clearing thread states if any finalizer tries to acquire the runtime head lock.
3.9: gh-100892: Fixed a crash due to a race while iterating over thread states in clearing threading.local.

Python 3.12.0 beta 2

Get it here: 3.12.0b2

116 new commits since 3.12.0 beta 1.

Python 3.11.4

Get it here: 3.11.4

233 new commits.

Python 3.10.12

Get it here: 3.10.12

Security-only release with no binaries. 20 new commits.

Python 3.9.17

Get it here: 3.9.17

Security-only release with no binaries. 26 commits.

Python 3.8.17

Get it here: 3.8.17

Security-only release with no binaries. 24 commits.

Python 3.7.17

Get it here as it might be the last release of 3.7 ever:
3.7.17

Security-only release with no binaries. 21 commits.

We hope you enjoy the new releases!

–
Łukasz Langa @ambv
on behalf of your friendly release team,

Ned Deily @nad
Steve Dower @steve.dower
Pablo Galindo Salgado @pablogsal
Łukasz Langa @ambv
Thomas Wouters @thomas

Python 3.12.0 beta 1 released

2023-05-22T16:55:00.003-04:00

I'm pleased to announce the release of Python 3.12 beta 1 (and feature freeze for Python 3.12).

https://www.python.org/downloads/release/python-3120b1/

This is a beta preview of Python 3.12

Python 3.12 is still in development. This release, 3.12.0b1, is the first of four planned beta release previews of 3.12.

Beta release previews are intended to give the wider community the opportunity to test new features and bug fixes and to prepare their projects to support the new feature release.

We strongly encourage maintainers of third-party Python projects to test with 3.12 during the beta phase and report issues found to [the Python bug tracker (Issues · python/cpython · GitHub) as soon as possible. While the release is planned to be feature complete entering the beta phase, it is possible that features may be modified or, in rare cases, deleted up until the start of the release candidate phase (Monday, 2023-07-31). Our goal is to have no ABI changes after beta 4 and as few code changes as possible after 3.12.0rc1, the first release candidate. To achieve that, it will be extremely important to get as much exposure for 3.12 as possible during the beta phase.

Please keep in mind that this is a preview release and its use is not recommended for production environments.

Major new features of the 3.12 series, compared to 3.11

Some of the new major new features and changes in Python 3.12 are:

New type annotation syntax for generic classes (PEP 695).
More flexible f-string parsing, allowing many things previously disallowed (PEP 701).
Even more improved error messages. More exceptions potentially caused by typos now make suggestions to the user.
Many large and small performance improvements (like PEP 709).
Support for the Linux perf profiler to report Python function names in traces.
The deprecated wstr and wstr_length members of the C implementation of unicode objects were removed, per PEP 623.
In the unittest module, a number of long deprecated methods and classes were removed. (They had been deprecated since Python 3.1 or 3.2).
The deprecated smtpd and distutils modules have been removed (see PEP 594 and PEP 632. The setuptools package (installed by default in virtualenvs and many other places) continues to provide the distutils module.
A number of other old, broken and deprecated functions, classes and methods have been removed.
Invalid backslash escape sequences in strings now warn with SyntaxWarning instead of DeprecationWarning, making them more visible. (They will become syntax errors in the future.)
The internal representation of integers has changed in preparation for performance enhancements. (This should not affect most users as it is an internal detail, but it may cause problems for Cython-generated code.)
(Hey, fellow core developer, if a feature you find important is missing from this list, let Thomas know.)

For more details on the changes to Python 3.12, see What’s new in Python 3.12. The next pre-release of Python 3.12 will be 3.12.0b2, currently scheduled for 2023-05-29.

More resources

Online Documentation.

PEP 693, the Python 3.12 Release Schedule.

Report bugs via GitHub Issues.

Help fund Python and its community.

And now for something completely different

As the first beta release marks the point at which we fork off the release branch from the main development branch, here’s a poem about forks in the road.

Two roads diverged in a yellow wood,
And sorry I could not travel both
And be one traveler, long I stood
And looked down one as far as I could
To where it bent in the undergrowth;

Then took the other, as just as fair,
And having perhaps the better claim,
Because it was grassy and wanted wear;
Though as for that the passing there
Had worn them really about the same,

And both that morning equally lay
In leaves, no step had trodden black.
Oh, I kept the first for another day!
Yet knowing how way leads on to way,
I doubted if I should ever come back.

I shall be telling this with a sigh
Somewhere ages and ages hence:
Two roads diverged in a wood, and I —
I took the one less traveled by,
And that has made all the difference.

The Road Not Taken, by Robert Frost.

Enjoy the new release

Your release team,

Thomas Wouters

Ned Deily

Steve Dower

Python 3.11.3, Python 3.10.11 and 3.12.0 alpha 7 are available

2023-04-05T08:25:00.001-04:00

It's time for another set of Python releases! Python 3.11.3, 3.10.11 and 3.12 alpha 7 are now available.

Python 3.12.0 alpha 7

The final alpha release of Python 3.12! The next release will be beta 1, which is also the feature freeze. Last chance to get your new features and API changes into 3.12!

https://www.python.org/downloads/release/python-3120a7/

246 new commits since 3.12.0a6.

Python 3.11.3

More bugfixes and security fixes for the best Python version (so far).

https://www.python.org/downloads/release/python-3113/

167 new commits since 3.11.2

Python 3.10.11

The final regular bugfix release for Python 3.10! It is now entering security-fix-only mode. This also means this is the last version for which we will ship Windows and macOS installers. If you rely on these binary releases, it's time to upgrade to Python 3.11.

https://www.python.org/downloads/release/python-31011/

121 new commits since 3.10.10.

We hope you enjoy the new releases!

https://www.python.org/psf/

From the release team,

Thomas Wouters
Pablo Galindo Salgado
Łukasz Langa
Ned Deily
Steve Dower

Python 3.12.0 alpha 6 released

2023-03-07T23:38:00.002-05:00

I'm pleased to announce the release of Python 3.12 alpha 6.

https://www.python.org/downloads/release/python-3120a6/

This is an early developer preview of Python 3.12.

Major new features of the 3.12 series, compared to 3.11

Python 3.12 is still in development. This release, 3.12.0a6 is the sixth of seven planned alpha releases.

Alpha releases are intended to make it easier to test the current state of new features and bug fixes and to test the release process.

During the alpha phase, features may be added up until the start of the beta phase (2023-05-08) and, if necessary, may be modified or deleted up until the release candidate phase (2023-07-31). Please keep in mind that this is a preview release and its use is not recommended for production environments.

Many new features for Python 3.12 are still being planned and written. Among the new major new features and changes so far:

Even more improved error messages. More exceptions potentially caused by typos now make suggestions to the user.
Support for the Linux perf profiler to report Python function names in traces.
The deprecated wstr and wstr_length members of the C implementation of unicode objects were removed, per PEP 623.
In the unittest module, a number of long deprecated methods and classes were removed. (They had been deprecated since Python 3.1 or 3.2).
The deprecated smtpd and distutils modules have been removed (see PEP 594 and PEP 632). The setuptools package (installed by default in virtualenvs and many other places) continues to provide the distutils module.
A number of other old, broken and deprecated functions, classes and methods have been removed.
Invalid backslash escape sequences in strings now warn with SyntaxWarning instead of DeprecationWarning, making them more visible. (They will become syntax errors in the future.)
The internal representation of integers has changed in preparation for performance enhancements. (This should not affect most users as it is an internal detail, but it may cause problems for Cython-generated code.)
(Hey, fellow core developer, if a feature you find important is missing from this list, let Thomas know.)

For more details on the changes in Python 3.12, see What's New In Python 3.12. The next pre-release of Python 3.12 will be 3.12.0a7, currently scheduled for 2023-04-03.

More resources

Online Documentation
PEP 693, the 3.12 Release Schedule
Report bugs at https://github.com/python/cpython/issues.
Help fund Python and its community.

And now for something completely different

Let me not to the marriage of true minds
Admit impediments. Love is not love
Which alters when it alteration finds,
Or bends with the remover to remove:
O, no! it is an ever-fixed mark,
That looks on tempests and is never shaken;
It is the star to every wandering bark,
Whose worth’s unknown, although his height be taken.
Love’s not Time’s fool, though rosy lips and cheeks
Within his bending sickle’s compass come;
Love alters not with his brief hours and weeks,
But bears it out even to the edge of doom.

If this be error, and upon me prov’d,
I never writ, nor no man ever lov’d.

Sonnet 116, by William Shakespeare.

Enjoy the new releases

https://www.python.org/psf/

Your release team,

Thomas Wouters

Ned Deily

Steve Dower

Python 3.11.2, Python 3.10.10 and 3.12.0 alpha 5 are available

2023-02-08T09:31:00.009-05:00

Hi everyone,

I am happy to report that after solving some last-time problems we have a bunch of fresh releases for you!

Python 3.12.0 alpha 5

Check the new alpha of 3.12 with some Star Trek vibes:

https://www.python.org/downloads/release/python-3120a5/

210 new commits since 3.12.0a4 last month

Python 3.11.2

A shipment of bugfixes and security releases for the newest Python!

https://www.python.org/downloads/release/python-3112/

194 new commits since 3.11.1

Python 3.10.10

Your trusty Python3.10 just got more stable and secure!

https://www.python.org/downloads/release/python-31010/

131 new commits since 3.10.9

We hope you enjoy the new releases!

Thanks to all of the many volunteers who help make Python Development and these releases possible! Please consider supporting our efforts by volunteering yourself or through organization contributions to the Python Software Foundation.
https://www.python.org/psf/
Your friendly release team,
Ned Deily @nad
Steve Dower @steve.dower
Pablo Galindo Salgado @pablogsal
Łukasz Langa @ambv
Thomas Wouters @thomas

Python 3.12.0 alpha 4 released

2023-01-10T15:24:00.000-05:00

I'm pleased to announce the release of Python 3.12 alpha 4.

https://www.python.org/downloads/release/python-3120a4/

This is an early developer preview of Python 3.12.

Major new features of the 3.12 series, compared to 3.11

Python 3.12 is still in development. This release, 3.12.0a4 is the fourth of seven planned alpha releases.

Alpha releases are intended to make it easier to test the current state of new features and bug fixes and to test the release process.

Many new features for Python 3.12 are still being planned and written. Among the new major new features and changes so far:

Even more improved error messages. More exceptions potentially caused by typos now make suggestions to the user.
Support for the Linux perf profiler to report Python function names in traces.
The deprecated wstr and wstr_length members of the C implementation of unicode objects were removed, per PEP 623.
In the unittest module, a number of long deprecated methods and classes were removed. (They had been deprecated since Python 3.1 or 3.2).
The deprecated smtpd and distutils modules have been removed (see PEP 594 and PEP 632). The setuptools package (installed by default in virtualenvs and many other places) continues to provide the distutils module.
A number of other old, broken and deprecated functions, classes and methods have been removed.
(Hey, fellow core developer, if a feature you find important is missing from this list, let Thomas know.)

For more details on the changes in Python 3.12, see What's New In Python 3.12. The next pre-release of Python 3.12 will be 3.12.0a4, currently scheduled for 2023-02-06.

More resources

Online Documentation
PEP 693, the 3.12 Release Schedule
Report bugs at https://github.com/python/cpython/issues.
Help fund Python and its community.

And now for something completely different

Two haikus apt, as Python's development springs ever forward.

I write, erase, rewrite
Erase again, and then
A poppy blooms.

Haiku by Katsushika Hokusai.

O snail
Climb Mount Fuji,
But slowly, slowly!

Haiku by Kobayashi Issa.

Enjoy the new releases

https://www.python.org/psf/

Your release team,

Thomas Wouters

Ned Deily

Steve Dower

Python 3.11.1, 3.10.9, 3.9.16, 3.8.16, 3.7.16, and 3.12.0 alpha 3 are now available

2022-12-06T17:58:00.004-05:00

Greetings! We bring you a slew of releases this fine Saint Nicholas / Sinterklaas day. Six simultaneous releases has got to be some record. There’s one more record we broke this time, you’ll see below.

In any case, updating is recommended due to security content:

3.7 - 3.12: gh-98739: Updated bundled libexpat to 2.5.0 to fix CVE-2022-43680 (heap use-after-free).
3.7 - 3.12: gh-98433: The IDNA codec decoder used on DNS hostnames by socket or asyncio related name resolution functions no longer involves a quadratic algorithm to fix CVE-2022-45061. This prevents a potential CPU denial of service if an out-of-spec excessive length hostname involving bidirectional characters were decoded. Some protocols such as urllib http 3xx redirects potentially allow for an attacker to supply such a name.
3.7 - 3.12: gh-100001: python -m http.server no longer allows terminal control characters sent within a garbage request to be printed to the stderr server log.
3.8 - 3.12: gh-87604: Avoid publishing list of active per-interpreter audit hooks via the gc module.
3.9 - 3.10 (already released in 3.11+ before): gh-97514: On Linux the multiprocessing module returns to using filesystem backed unix domain sockets for communication with the forkserver process instead of the Linux abstract socket namespace. Only code that chooses to use the “forkserver” start method is affected. This prevents Linux CVE-2022-42919 (potential privilege escalation) as abstract sockets have no permissions and could allow any user on the system in the same network namespace (often the whole system) to inject code into the multiprocessing forkserver process. This was a potential privilege escalation. Filesystem based socket permissions restrict this to the forkserver process user as was the default in Python 3.8 and earlier.
3.7 - 3.10: gh-98517: Port XKCP’s fix for the buffer overflows in SHA-3 to fix CVE-2022-37454.
3.7 - 3.9 (already released in 3.10+ before): gh-68966: The deprecated mailcap module now refuses to inject unsafe text (filenames, MIME types, parameters) into shell commands to address CVE-2015-20107. Instead of using such text, it will warn and act as if a match was not found (or for test commands, as if the test failed).

Python 3.12.0 alpha 3

Get it here, read the change log, sing a GPT-3-generated Sinterklaas song:

https://www.python.org/downloads/release/python-3120a3/

216 new commits since 3.12.0 alpha 2 last month.

Python 3.11.1

Get it here, see the change log, read the recipe for quark soup:

https://www.python.org/downloads/release/python-3111/

A whopping 495 new commits since 3.11.0. This is a massive increase of changes comparing to 3.10 at the same stage in the release cycle: there were “only” 339 commits between 3.10.0 and 3.10.1.

Python 3.10.9

Get it here, read the change log, see circular patterns:

https://www.python.org/downloads/release/python-3109/

165 new commits.

Python 3.9.16

Get it here, read the change log, consider upgrading to a newer version:

https://www.python.org/downloads/release/python-3916/

Security-only release with no binaries. 10 commits.

Python 3.8.16

Get it here, see the change log, definitely upgrade to a newer version:

https://www.python.org/downloads/release/python-3816/

Security-only release with no binaries. 9 commits.

Python 3.7.16

Get it here, read the change log, check PEP 537 to confirm EOL is coming to this version in June 2023:

https://www.python.org/downloads/release/python-3716/

Security-only release with no binaries. 8 commits.

We hope you enjoy the new releases!

https://www.python.org/psf/

Your friendly release team,

Ned Deily @nad
Steve Dower @steve.dower
Pablo Galindo Salgado @pablogsal
Łukasz Langa @ambv
Thomas Wouters @thomas

Python 3.12.0 alpha 2 released

2022-11-15T08:06:00.000-05:00

I'm pleased to announce the release of Python 3.12 alpha 2.

https://www.python.org/downloads/release/python-3120a2/

This is an early developer preview of Python 3.12.

Major new features of the 3.12 series, compared to 3.11

Python 3.12 is still in development. This release, 3.12.0a2 is the second of seven planned alpha releases.

Alpha releases are intended to make it easier to test the current state of new features and bug fixes and to test the release process.

Many new features for Python 3.12 are still being planned and written. Among the new major new features and changes so far:

Even more improved error messages. More exceptions potentially caused by typos now make suggestions to the user.
Support for the Linux perf profiler to report Python function names in traces.
The deprecated wstr and wstr_length members of the C implementation of unicode objects were removed, per PEP 623.
In the unittest module, a number of long deprecated methods and classes were removed. (They had been deprecated since Python 3.1 or 3.2).
The deprecated smtpd and distutils modules have been removed (see PEP 594 and PEP 632). The setuptools package (installed by default in virtualenvs and many other places) continues to provide the distutils module.
A number of other old, broken and deprecated functions, classes and methods have been removed.
(Hey, fellow core developer, if a feature you find important is missing from this list, let Thomas know.)

For more details on the changes in Python 3.12, see What's New In Python 3.12. The next pre-release of Python 3.12 will be 3.12.0a3, currently scheduled for 2022-12-05.

More resources

Online Documentation
PEP 693, the 3.12 Release Schedule
Report bugs at https://github.com/python/cpython/issues.
Help fund Python and its community.

And now for something completely different

Life, believe, is not a dream
So dark as sages say;
Oft a little morning rain
Foretells a pleasant day.
Sometimes there are clouds of gloom,
But these are transient all;
If the shower will make the roses bloom,
O why lament its fall?

Rapidly, merrily,
Life's sunny hours flit by,
Gratefully, cheerily,
Enjoy them as they fly!

What though Death at times steps in
And calls our Best away?
What though sorrow seems to win,
O'er hope, a heavy sway?
Yet hope again elastic springs,
Unconquered, though she fell;
Still buoyant are her golden wings,
Still strong to bear us well.

Manfully, fearlessly,
The day of trial bear,
For gloriously, victoriously,
Can courage quell despair!

Life, by Charlotte Brontë, from Poems by Currer, Ellis, and Acton Bell.

Charlotte wrote about the publishing under pseudonyms by her and her sisters, Emily and Anne, in a preface to Emily's Wuthering Heights:

Averse to personal publicity, we veiled our own names under those of Currer, Ellis and Acton Bell; the ambiguous choice being dictated by a sort of conscientious scruple at assuming Christian names positively masculine, while we did not like to declare ourselves women, because – without at that time suspecting that our mode of writing and thinking was not what is called "feminine" – we had a vague impression that authoresses are liable to be looked on with prejudice; we had noticed how critics sometimes use for their chastisement the weapon of personality, and for their reward, a flattery, which is not true praise.

Enjoy the new releases

https://www.python.org/psf/

Your release team,

Thomas Wouters

Ned Deily

Steve Dower

Python 3.12.0 alpha 1 released

2022-10-25T00:00:00.000-04:00

As Pablo released Python 3.11.0 final earlier today, now it's my turn to release Python 3.12.0 alpha 1.

https://www.python.org/downloads/release/python-3120a1/

This is an early developer preview of Python 3.12

Major new features of the 3.12 series, compared to 3.11

Python 3.12 is still in development. This release, 3.12.0a1, is the first of seven planned alpha releases.

Alpha releases are intended to make it easier to test the current state of new features and bug fixes and to test the release process.

During the alpha phase, features may be added up until the start of the beta phase (2023-05-08) and, if necessary, may be modified or deleted up until the release candidate phase (2023-07-31). Please keep in mind that this is a preview release and its use is not recommended for production environments.

Many new features for Python 3.12 are still being planned and written. Among the new major new features and changes so far:

The deprecated `wstr` and `wstr_length` members of the C implementation of unicode objects were removed, per PEP 623.
In the `unittest` module, a number of long deprecated methods and classes were removed. (They had been deprecated since Python 3.1 or 3.2).
The deprecated `smtpd` module has been removed.
A number of other old, broken and deprecated functions, classes and methods have been removed.
(Hey, **fellow core developer,** if a feature you find important is missing from this list, let Thomas know.)

The next pre-release of Python 3.12 will be 3.12.0a2, currently scheduled for 2022-11-14.

More resources

Online Documentation
PEP 693, the 3.12 Release Schedule
Report bugs at https://github.com/python/cpython/issues.
Help fund Python and its community at https://www.python.org/psf/donations/.

And now for something completely different

This is Not the Poem that I Had Hoped to Write

This is not the poem that I had hoped to write
when I sat at my desk and the page was white.
You see, there were other words that I’d had in mind,
yet this is what I leave behind.

I thought it was a poem to eradicate war;
one of such power, it would heal all the sores
of a world torn apart by conflict and schism.
But it isn’t.

Lovers, I’d imagined, would quote from it daily,
Mothers would sing it to soothe crying babies.
And whole generations would be given new hope.
Nope.

I had grand aspirations. Believe me, I tried.
Humanity examined with lessons applied.
But the right words escaped me; so often they do.
Have these in lieu.

Brian Bilston

Enjoy the new releases

https://www.python.org/psf/

Your release team,
Thomas Wouters
Ned Deily
Steve Dower

Python 3.11.0 is now available

2022-10-24T16:29:00.003-04:00

This is the release of Python 3.11.0

Python 3.11 is finally released. In the CPython release team, we have put a lot of effort into making 3.11 the best version of Python possible. Better tracebacks, faster Python, exception groups and except*, typing improvements and much more. Get it here:

https://www.python.org/downloads/release/python-3110/

Major new features of the 3.11 series, compared to 3.10

Among the new major new features and changes so far:

PEP 657 – Include Fine-Grained Error Locations in Tracebacks
PEP 654 – Exception Groups and except*
PEP 673 – Self Type
PEP 646 – Variadic Generics
PEP 680 – tomllib: Support for Parsing TOML in the Standard Library
PEP 675 – Arbitrary Literal String Type
PEP 655 – Marking individual TypedDict items as required or potentially-missing
bpo-46752 – Introduce task groups to asyncio
PEP 681 – Data Class Transforms
bpo-433030– Atomic grouping ((?>…)) and possessive quantifiers (*+, ++, ?+, {m,n}+) are now supported in regular expressions.
The Faster Cpython Project is already yielding some exciting results. Python 3.11 is up to 10-60% faster than Python 3.10. On average, we measured a 1.22x speedup on the standard benchmark suite. See Faster CPython for details.

More resources

Online Documentation

PEP 664, 3.11 Release Schedule
Report bugs at https://bugs.python.org.

Help fund Python and its community.

And now for something completely different

When a spherical non-rotating body of a critical radius collapses under its own gravitation under general relativity, theory suggests it will collapse to a single point. This is not the case with a rotating black hole (a Kerr black hole). With a fluid rotating body, its distribution of mass is not spherical (it shows an equatorial bulge), and it has angular momentum. Since a point cannot support rotation or angular momentum in classical physics (general relativity being a classical theory), the minimal shape of the singularity that can support these properties is instead a ring with zero thickness but non-zero radius, and this is referred to as a ringularity or Kerr singularity.

This kind of singularity has the following peculiar property. The spacetime allows a geodesic curve (describing the movement of observers and photons in spacetime) to pass through the center of this ring singularity. The region beyond permits closed time-like curves. Since the trajectory of observers and particles in general relativity are described by time-like curves, it is possible for observers in this region to return to their past. This interior solution is not likely to be physical and is considered a purely mathematical artefact.

There are some other interesting free-fall trajectories. For example, there is a point in the axis of symmetry that has the property that if an observer is below this point, the pull from the singularity will force the observer to pass through the middle of the ring singularity to the region with closed time-like curves and it will experience repulsive gravity that will push it back to the original region, but then it will experience the pull from the singularity again and will repeat this process forever. This is, of course, only if the extreme gravity doesn’t destroy the observer first.

We hope you enjoy the new releases!

https://www.python.org/psf/

Your friendly release team,
Ned Deily @nad
Steve Dower @steve.dower
Pablo Galindo Salgado @pablogsal

Python Core Development Sprint 2022: 3.11 and beyond!

2022-10-24T12:05:00.000-04:00

From October 3rd to October 7th a group of Python core developers gathered for a sprint hosted at Google. The event was mainly sponsored by Google and the Python Software Foundation. The core team used to do this annually between 2016 and 2019. It was high time to return to this tradition as the remote online sprints organized in years 2020 and 2021 proved to be a poor substitution for in-person collaboration.

Participating in a core sprint that isn't following a public tech conference is unique in many ways. We come fresh and ready to work on Python for the entire week, without the brain fog that builds up during a multi-day conference. With other contributors there with us, it's easier to focus on the task at hand without professional or private interruptions. Finally, on a human level, we really missed each other. And some of us never met in real life before.

The sprint was the most active week on the repository in five years. It managed to overshadow the sprint at Meta in 2016 which happened shortly before the 3.6 beta freeze, at the time said to be "the most productive [single] week for Python ever". During the five days of the sprint there were 344 commits to our five active branches that span versions of Python from 3.7 to 3.12. 157 of those were made to the main branch alone, which will end up being Python 3.12. Some fixes were pretty deep, like the sneaky 3.11 crasher that only reproduces when performing a full pytest run on a large async app, and disappears once you start diagnosing it. Progress was made on putting full f-string parsing into the grammar of the language, which will allow some new constructs that I'm sure will raise more than one eyebrow when the time comes!

Using the opportunity of meeting in person, the sprint week contained some additional events like a Q&A meeting between the core developers and the Steering Council. We discussed the process for core mentorship, open undecided PEPs like PEP 649, or the future of the C API. To be clear, no decisions about the Python programming language are made behind closed doors. The meetings during the sprint help reaching consensus but continue in our dedicated online communications channels like discuss.python.org and the python-dev mailing list. All changes require opening issues on GitHub, and larger ones require going through the PEP process.

A few interest groups gathered to meet during the sprint as well. Most of those meetings were hybrid, meaning that they included remote participants dialing in. The documentation experts, the core workflow experts, the asyncio experts, the code of conduct working group, and the C API interest group all met to discuss their respective topics.

One highlight of the event that most participants brought up is rapid knowledge sharing that it allowed. Pair programming, whiteboard design, or simply talking somebody through a problem, happened often. Among the topics in this vein the eval breaker came up often, as did asyncio and typing topics. Ken Jin presented a summary of the performance improvements coming in Python 3.11, and Dustin Ingram talked about Sigstore for Python releases. Speaking of security, Google provided core developers attending the sprint with FIDO2 hardware security keys to additionally secure their access to GitHub and PyPI.

Some work looks further into the future. Ken Jin and C.A.M. Gerlach authored a new PEP during the sprint as well, and PEP 688 received a rewrite from Jelle Zijlstra. Carl Meyer worked on dict watchers and callbacks when a type is modified, both needed to allow for a pluggable JIT.

A vote to nominate a new core developer, Alex Waygood, was opened during the sprint and passed unanimously. Alex was present at the sprint as a collaborating triager and mentee.

Huge thanks to everybody that participated! The list below is in alphabetical order, along with thanks to the organizations that helped finance their attendance. We also acknowledge that travel for a multi-day event separates people from their families. We're grateful for their understanding. In the end, we had 28 in-person participants from 8 countries on 3 continents:

Brandt Bucher
Brett Cannon (Microsoft)
Ned Deily
Martin Demello (Google)
C.A.M. Gerlach
Larry Hastings
Dustin Ingram (Google)
Ken Jin
Hugo van Kemenade
Senthil Kumaran
Łukasz Langa
Carl Meyer (Meta)
Joannah Nanjekye
Lysandros Nikolaou
Benjamin Peterson
Guido van Rossum (Microsoft)
Pablo Galindo Salgado (Bloomberg)
Yury Selivanov (EdgeDB)
Mariatta (Google)
Mark Shannon (Microsoft)
Eric Smith
Gregory P. Smith (Google)
Eric Snow (Microsoft)
Barry Warsaw (Microsoft)
Alex Waygood
Frank Wierzbicki
Thomas Wouters (Google)
Jelle Zijlstra (Quora)

Special thanks to Greg for making the event happen!

Python versions 3.10.8, 3.9.15, 3.8.15, 3.7.15 now available

2022-10-11T15:44:00.015-04:00

Déjà vu? Right, a month after the expedited releases we are doing the dance again. This coincides with the regular scheduled time for 3.10.8 but since we accrued a few fixes in 3.7 - 3.9 as well, we’re again releasing all four editions at the same time. We’re not promising to continue at this pace

Security content this time

CVE-2022-40674: bundled libexpat was upgraded from 2.4.7 to 2.4.9 which fixes a heap use-after-free vulnerability in function doContent
gh-97616: a fix for a possible buffer overflow in list *= int
gh-97612: a fix for possible shell injection in the example script get-remote-certificate.py(this issue originally had a CVE assigned to it, which its author withdrew)
gh-96577: a fix for a potential buffer overrun in msilib

Python 3.10.8

Get it here: https://www.python.org/downloads/release/python-3108/

As a bugfix release coming a mere month after an out-of-schedule security release, 3.10.8 is somewhat smaller compared to 3.9.8 released at the same stage of the release cycle a year ago. There’s 151 commits vs 204 in 3.9. It’s still a larger release than 3.10.7 at 113 commits. One way or the other, it’s worth checking out the change log.

And now for something completely different

Granular convection is a phenomenon where granular material subjected to shaking or vibration will exhibit circulation patterns similar to types of fluid convection.

It is sometimes described as the Brazil nut effect when the largest particles end up on the surface of a granular material containing a mixture of variously sized objects; this derives from the example of a typical container of mixed nuts, where the largest will be Brazil nuts.

The phenomenon is also known as the muesli effect since it is seen in packets of breakfast cereal containing particles of different sizes but similar densities, such as muesli mix.

Under experimental conditions, granular convection of variously sized particles has been observed forming convection cells similar to fluid motion.

We hope you enjoy the new releases!

Your friendly release team,

Ned Deily @nad
Steve Dower @steve.dower
Pablo Galindo Salgado @pablogsal
Łukasz Langa @ambv

Python 3.11.0rc2 is now available

2022-09-12T07:26:00.006-04:00

This is the second release candidate of Python 3.11

https://www.python.org/downloads/release/python-3110rc2/

This release, 3.11.0rc2, is the last preview before the final release of Python 3.11.0 on 2022-10-24.

Entering the release candidate phase, only reviewed code changes which are clear bug fixes are allowed between this release candidate and the final release. The second candidate and the last planned release preview is currently planned for Monday, 2022-09-05 while the official release is planned for Monday, 2022-10-24.

There will be no ABI changes from this point forward in the 3.11 series and the goal is that there will be as few code changes as possible.

Modification of the final release

Due to the fact that we needed to delay the last release candidate by a week and because of personal scheduling problems I am delaying the final release to 2022-10-24 (three weeks from the original date).

Call to action

The 3.11 branch is now accepting changes for 3.11.1. To maximize stability, the final release will be cut from the v3.11.0rc2 tag. If you
need the release manager (me) to cherry-pick any critical fixes, mark issues as release blockers, and/or add me as a reviewer on a critical
backport PR on GitHub. To see which changes are currently cherry-picked for inclusion in 3.11.0, look at the short-lived branch-v3.11.0
https://github.com/python/cpython/tree/branch-v3.11.0 on GitHub.

Core developers: all eyes on the docs now

* Are all your changes properly documented?

* Did you notice other changes you know of to have insufficient documentation?

Community members

We strongly encourage maintainers of third-party Python projects to prepare their projects for 3.11 compatibilities during this phase. As always, report any issues to the Python bug tracker.

Please keep in mind that this is a preview release and its use is **not** recommended for production environments.

Major new features of the 3.11 series, compared to 3.10

Among the new major new features and changes so far:

PEP 657 – Include Fine-Grained Error Locations in Tracebacks
PEP 654 – Exception Groups and except*
PEP 673 – Self Type
PEP 646 – Variadic Generics
PEP 680 – tomllib: Support for Parsing TOML in the Standard Library
PEP 675 – Arbitrary Literal String Type
PEP 655 – Marking individual TypedDict items as required or potentially-missing
bpo-46752 – Introduce task groups to asyncio
PEP 681 – Data Class Transforms
bpo-433030– Atomic grouping ((?>…)) and possessive quantifiers (*+, ++, ?+, {m,n}+) are now supported in regular expressions.
The Faster Cpython Project is already yielding some exciting results. Python 3.11 is up to 10-60% faster than Python 3.10. On average, we measured a 1.22x speedup on the standard benchmark suite. See Faster CPython for details.

(Hey,

fellow core developer,

if a feature you find important is missing from this list,

let Pablo know

The next release will be the final release of Python 3.11.0, which is currently scheduled for Monday, 2022-10-24.

More resources

Online Documentation

PEP 664, 3.11 Release Schedule
Report bugs at https://bugs.python.org.

Help fund Python and its community.

And now for something completely different

In general relativity, a white hole is a theoretical region of spacetime and singularity that cannot be entered from the outside, although energy-matter, light and information can escape from it. In this sense, it is the reverse of a black hole, which can be entered only from the outside and from which energy-matter, light and information cannot escape. White holes appear in the theory of eternal black holes. In addition to a black hole region in the future, such a solution of the Einstein field equations has a white hole region in its past. This region does not exist for black holes that have formed through gravitational collapse, however, nor are there any observed physical processes through which a white hole could be formed. Supermassive black holes are theoretically predicted to be at the centre of every galaxy and that possibly, a galaxy cannot form without one. Stephen Hawking and others have proposed that these supermassive black holes spawn a supermassive white hole.

We hope you enjoy the new releases!

https://www.python.org/psf/

Your friendly release team,
Ned Deily @nad
Steve Dower @steve.dower
Pablo Galindo Salgado @pablogsal

Python releases 3.10.7, 3.9.14, 3.8.14, and 3.7.14 are now available

2022-09-07T09:03:00.002-04:00

We have some security content, and plenty of regular bug fixes for 3.10. Let’s dive right in.

CVE-2020-10735

Converting between int and str in bases other than 2 (binary), 4, 8 (octal), 16 (hexadecimal), or 32 such as base 10 (decimal) now raises a ValueError if the number of digits in string form is above a limit to avoid potential denial of service attacks due to the algorithmic complexity.

Security releases for 3.9.14, 3.8.14, and 3.7.14 are made available simultaneously to address this issue, along with some less urgent security content.

Upgrading your installations is highly recommended.

Python 3.10.7

Get it here:

https://www.python.org/downloads/release/python-3107/

This bugfix version of Python was released out-of-schedule to address the CVE, and as such contains a smaller number of changes compared to 3.10.6 (200 commits), or in fact 3.9.7 (187 commits) at the same stage of the release cycle a year ago. But there’s still over a 100 commits in this latest Python version so it’s worth checking out the change log.

And now for something completely different

In quantum mechanics, the uncertainty principle (also known as Heisenberg’s uncertainty principle) is any of a variety of mathematical inequalities asserting a fundamental limit to the accuracy with which the values for certain pairs of physical quantities of a particle, such as position and momentum or the time and the energy can be predicted from initial conditions.

Such variable pairs are known as complementary variables or canonically conjugate variables; and, depending on interpretation, the uncertainty principle limits to what extent such conjugate properties maintain their approximate meaning, as the mathematical framework of quantum physics does not support the notion of simultaneously well-defined conjugate properties expressed by a single value.

The uncertainty principle implies that it is in general not possible to predict the value of a quantity with arbitrary certainty, even if all initial conditions are specified.

We hope you enjoy the new releases!

https://www.python.org/psf/

Your friendly release team,

Ned Deily @nad
Steve Dower @steve.dower
Pablo Galindo Salgado @pablogsal
Łukasz Langa @ambv

Python 3.11.0rc1 is now available

2022-08-08T13:17:00.002-04:00

This is the first release candidate of Python 3.11

https://www.python.org/downloads/release/python-3110rc1/

This release, **3.11.0rc1**, is the penultimate release preview. Entering the release candidate phase, only reviewed code changes which are clear bug fixes are allowed between this release candidate and the final release. The second candidate and the last planned release preview is currently planned for Monday, 2022-09-05 while the official release is planned for Monday, 2022-10-03.

There will be no ABI changes from this point forward in the 3.11 series and the goal is that there will be as few code changes as possible.

Call to action

Core developers: all eyes on the docs now

* Are all your changes properly documented?

* Did you notice other changes you know of to have insufficient documentation?

Community members

We strongly encourage maintainers of third-party Python projects to prepare their projects for 3.11 compatibilities during this phase. As always, report any issues to the Python bug tracker.

Please keep in mind that this is a preview release and its use is **not** recommended for production environments.

Major new features of the 3.11 series, compared to 3.10

Among the new major new features and changes so far:

PEP 657 – Include Fine-Grained Error Locations in Tracebacks
PEP 654 – Exception Groups and except*
PEP 673 – Self Type
PEP 646 – Variadic Generics
PEP 680 – tomllib: Support for Parsing TOML in the Standard Library
PEP 675 – Arbitrary Literal String Type
PEP 655 – Marking individual TypedDict items as required or potentially-missing
bpo-46752 – Introduce task groups to asyncio
PEP 681 – Data Class Transforms
bpo-433030– Atomic grouping ((?>…)) and possessive quantifiers (*+, ++, ?+, {m,n}+) are now supported in regular expressions.
The Faster Cpython Project is already yielding some exciting results. Python 3.11 is up to 10-60% faster than Python 3.10. On average, we measured a 1.22x speedup on the standard benchmark suite. See Faster CPython for details.

(Hey,

fellow core developer,

if a feature you find important is missing from this list,

let Pablo know

The next pre-release of Python 3.11 will be 3.11.0rc2, currently scheduled for Monday, 2022-09-05.

More resources

Online Documentation

PEP 664, 3.11 Release Schedule
Report bugs at https://bugs.python.org.

Help fund Python and its community.

And now for something completely different

A quark star is a hypothetical type of compact, exotic star, where extremely high core temperature and pressure have forced nuclear particles to form quark matter, a continuous state of matter consisting of free quarks.

Some massive stars collapse to form neutron stars at the end of their life cycle, as has been both observed and explained theoretically. Under the extreme temperatures and pressures inside neutron stars, the neutrons are normally kept apart by degeneracy pressure, stabilizing the star and hindering further gravitational collapse. However, it is hypothesized that under even more extreme temperature and pressure, the degeneracy pressure of the neutrons is overcome, and the neutrons are forced to merge and dissolve into their constituent quarks, creating an ultra-dense phase of quark matter based on densely packed quarks. In this state, a new equilibrium is supposed to emerge, as a new degeneracy pressure between the quarks, as well as repulsive electromagnetic forces, will occur and hinder total gravitational collapse.

If these ideas are correct, quark stars might occur, and be observable, somewhere in the universe. Theoretically, such a scenario is seen as scientifically plausible, but it has been impossible to prove both observationally and experimentally because the very extreme conditions needed for stabilizing quark matter cannot be created in any laboratory nor observed directly in nature. The stability of quark matter, and hence the existence of quark stars, is for these reasons among the unsolved problems in physics.

We hope you enjoy the new releases!

https://www.python.org/psf/

Your friendly release team,
Ned Deily @nad
Steve Dower @steve.dower
Pablo Galindo Salgado @pablogsal