Monday, June 6, 2022

Python 3.10.5 is available

The latest bugfix drop for Python 3.10 is here: Python 3.10.5. This release packs more than 230 bugfixes and docs changes, so you surely want to update :) You can get it here:

https://www.python.org/downloads/release/python-3105/

This is the first maintenance release of Python 3.10


Python 3.10.5 is the newest major release of the Python programming language, and it contains many new features and optimizations.


Major new features of the 3.10 series, compared to 3.9

Among the new major new features and changes so far:

  • PEP 623 – Deprecate and prepare for the removal of the wstr member in PyUnicodeObject.
  • PEP 604 – Allow writing union types as X | Y
  • PEP 612 – Parameter Specification Variables
  • PEP 626 – Precise line numbers for debugging and other tools.
  • PEP 618 – Add Optional Length-Checking To zip.
  • bpo-12782: Parenthesized context managers are now officially allowed.
  • PEP 634 – Structural Pattern Matching: Specification
  • PEP 635 – Structural Pattern Matching: Motivation and Rationale
  • PEP 636 – Structural Pattern Matching: Tutorial

More resources

bpo-38605from __future__ import annotations (PEP 563) used to be on this list in previous pre-releases but it has been postponed to Python 3.11 due to some compatibility concerns. You can read the Steering Council communication about it here to learn more.

And now for something completely different

Strange quarks are the third lightest quarks, which are subatomic particles that are so small,  they are believed to be the fundamental particles, and not further divisible. Like down quarks, strange quarks have a charge of -1/3. Like all fermions (which are particles that can not exist in the same place at the same time), strange quarks have a spin of 1/2. What makes strange quarks different from down quarks–apart from having 25 times the mass of down quarks–is that they have something that scientists call "strangeness." Strangeness is basically a resistance to decay against strong force and electromagnetism. This means that any particle that contains a strange quark can not decay due to strong force (or electromagnetism), but instead with the much slower weak force. It was believed that this was a 'strange' method of decay, which is why the scientists gave the particles that name.

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.

Wednesday, June 1, 2022

Expedited release of Python3.11.0b3

Due to a known incompatibility with pytest and the previous beta release (Python 3.11.0b2) and after some deliberation, I and the rest of the release team have decided to do an expedited release of Python 3.11.0b3 so the community can continue testing their packages with pytest and therefore testing the betas as expected.

 Where can I get the new release?



What happened? 

Pytest by default rewrites the AST nodes in the testing code to provide better diagnostics when something fails in the test. For doing this, it creates new AST nodes that are then compiled. In Python 3.11, after some changes in the compiler and AST nodes, these new AST nodes that pytest was creating were invalid. This causes CPython to crash in debug mode because we have several assert statements in the compiler, but in release mode this doesn't cause always a crash, but it creates potential corrupted structures in the compiler silently. In 3.11.0b3 we changed the compiler to reject invalid AST nodes, so what was a silent problem and a crash in debug mode turned into an exception being raised. 

We had a fix to allow the nodes that pytest is creating to work to preserve backwards compatibility but unfortunately, it didn't make it into 3.11.0b2. Is still possible to use pytest with 3.11.0b2 if you add "--assert=plain" to the pytest invocation but given how many users would have to modify their test suite invocation we decided to proceed with a new release that has the fix. 

What happens with future beta releases 

Python 3.11.0b3 should be considered as an extra beta release. Instead of four beta releases, we will have five and the next beta release (3.11.0b4) will happen as scheduled on Thursday, 2022-06-16. 

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.

Tuesday, May 31, 2022

Python 3.11.0b2 is now available

Does anyone want bug fixes? Because we have 164 new commits fixing different things, from code to documentation. If you have reported some issue after 3.11.0b1, you should check if is fixed and if not, make sure you tell us so we can take a look  :eyes: We still have two more betas to go so help us to make sure we don’t miss anything so everything is ready for the final release :rocket:

https://www.python.org/downloads/release/python-3110b2/

This is a beta preview of Python 3.11

Python 3.11 is still in development. 3.11.0b2 is the second of four planned beta release previews. 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 3.11 during the beta phase and report issues found to the Python bug tracker 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, 2021-08-02). Our goal is have no ABI changes after beta 4 and as few code changes as possible after 3.11.0rc1, the first release candidate. To achieve that, it will be extremely important to get as much exposure for 3.11 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 3.11 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 3.11.0b3, currently scheduled for  currently scheduled for Thursday, 2022-06-16

More resources

And now for something completely different

The Planck time is the time required for light to travel a distance of 1 Planck length in a vacuum, which is a time interval of approximately 5.39*10^(−44) s. No current physical theory can describe timescales shorter than the Planck time, such as the earliest events after the Big Bang, and it is conjectured that the structure of time breaks down on intervals comparable to the Planck time. While there is currently no known way to measure time intervals on the scale of the Planck time, researchers in 2020 found that the accuracy of an atomic clock is constrained by quantum effects on the order of the Planck time, and for the most precise atomic clocks thus far they calculated that such effects have been ruled out to around 10^−33s, or 10 orders of magnitude above the Planck scale.

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.

Tuesday, May 17, 2022

Python 3.9.13 is now available

 

This is the thirteenth maintenance release of Python 3.9. Get it here:
Python 3.9.13

According to the release calendar specified in PEP 596, Python 3.9.13 is the final regular maintenance release. Starting now, the 3.9 branch will only accept security fixes and releases of those will be made in source-only form until October 2025.

This is a milestone moment for me as it means that now both of my release series are security-only. My work as release manager enters its final stage. I’m not crying, you’re crying! :smiling_face_with_tear:

Compared to the 3.8 series, this last regular bugfix release is still pretty active at 166 commits since 3.9.12. In comparison, version 3.8.10, the final regular bugfix release of Python 3.8, included only 92 commits. However, it’s likely that it was 3.8 that was special here with the governance changes occupying core developers’ minds. For reference, version 3.7.8, the final regular bugfix release of Python 3.7, included 187 commits.

In any case, 166 commits is quite a few changes, some of which being pretty important fixes. Take a look at the change log for details.

Major new features of the 3.9 series, compared to 3.8

Some of the new major new features and changes in Python 3.9 are:

  • PEP 573, Module State Access from C Extension Methods
  • PEP 584, Union Operators in dict
  • PEP 585, Type Hinting Generics In Standard Collections
  • PEP 593, Flexible function and variable annotations
  • PEP 602, Python adopts a stable annual release cadence
  • PEP 614, Relaxing Grammar Restrictions On Decorators
  • PEP 615, Support for the IANA Time Zone Database in the Standard Library
  • PEP 616, String methods to remove prefixes and suffixes
  • PEP 617, New PEG parser for CPython
  • BPO 38379, garbage collection does not block on resurrected objects;
  • BPO 38692, os.pidfd_open added that allows process management without races and signals;
  • BPO 39926, Unicode support updated to version 13.0.0;
  • BPO 1635741, when Python is initialized multiple times in the same process, it does not leak memory anymore;
  • A number of Python builtins (range, tuple, set, frozenset, list, dict) are now sped up using PEP 590 vectorcall;
  • A number of Python modules (_abc, audioop, _bz2, _codecs, _contextvars, _crypt, _functools, _json, _locale, operator, resource, time, _weakref) now use multiphase initialization as defined by PEP 489;
  • A number of standard library modules (audioop, ast, grp, _hashlib, pwd, _posixsubprocess, random, select, struct, termios, zlib) are now using the stable ABI defined by PEP 384.

You can find a more comprehensive list in this release’s “What’s New” document.

We hope you enjoy Python 3.9!

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.

Your friendly release team,
Ned Deily @nad
Steve Dower @steve.dower
Łukasz Langa @ambv

Saturday, May 7, 2022

Python 3.11.0b1 is now available

We did it, team! After quite a bumpy release process and a bunch of last-time fixes, we have reached beta 1 and feature freeze. What a ride eh? You can get the shiny new release artefacts from here:

https://www.python.org/downloads/release/python-3110b1/

This is a beta preview of Python 3.11

Python 3.11 is still in development. 3.11.0b1 is the first of four planned beta release previews. 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 3.11 during the beta phase and report issues found to the Python bug tracker 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, 2021-08-02). Our goal is have no ABI changes after beta 4 and as few code changes as possible after 3.11.0rc1, the first release candidate. To achieve that, it will be extremely important to get as much exposure for 3.11 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 3.11 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
  • 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 3.11.0b2, currently scheduled for Monday, 2022-05-30.

More resources

And now for something completely different

The holographic principle is a tenet of string theories and a supposed property of quantum gravity that states that the description of a volume of space can be thought of as encoded on a lower-dimensional boundary to the region—such as a light-like boundary like a gravitational horizon. First proposed by Gerard 't Hooft, it was given a precise string-theory interpretation by Leonard Susskind, who combined his ideas with previous ones of 't Hooft and Charles Thorn.[ Leonard Susskind said, “The three-dimensional world of ordinary experience––the universe filled with galaxies, stars, planets, houses, boulders, and people––is a hologram, an image of reality cited on a distant two-dimensional (2D) surface." As pointed out by Raphael Bousso, Thorn observed in 1978 that string theory admits a lower-dimensional description in which gravity emerges from it in what would now be called a holographic way.

The holographic principle was inspired by black hole thermodynamics, which conjectures that the maximal entropy in any region scales with the radius squared, and not cubed as might be expected. In the case of a black hole, the insight was that the informational content of all the objects that have fallen into the hole might be entirely contained in surface fluctuations of the event horizon. The holographic principle resolves the black hole information paradox within the framework of string theory. However, there exist classical solutions to the Einstein equations that allow values of the entropy larger than those allowed by an area law, hence in principle larger than those of a black hole. These are the so-called “Wheeler’s bags of gold”. The existence of such solutions conflicts with the holographic interpretation, and their effects in a quantum theory of gravity including the holographic principle are not full

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.

Wednesday, April 6, 2022

The last Python 3.11 alpha (3.11.0a7) is available

Brrrrr… do you feel that? That’s the chill of beta freeze coming closer. Meanwhile, your friendly CPython release team doesn’t rest and we have prepared a shiny new release for you: Python 3.11.0a7.

https://www.python.org/downloads/release/python-3110a7/

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
  • The Faster Cpython Project is already yielding some exciting results: this version of CPython 3.11 is ~19% faster on the geometric mean of the performance benchmarks, compared to 3.10.0.
  • (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 3.11.0b1, currently scheduled for Friday, 2022-05-06.

More resources

And now for something completely different

In mathematics, the Dirac delta distribution (δ distribution) is a generalized function or distribution over the real numbers, whose value is zero everywhere except at zero, and whose integral over the entire real line is equal to one. The current understanding of the impulse is as a linear functional that maps every continuous function to its value at zero. The delta function was introduced by physicist Paul Dirac as a tool for the normalization of state vectors. It also has uses in probability theory and signal processing. Its validity was disputed until Laurent Schwartz developed the theory of distributions where it is defined as a linear form acting on functions. 

Defining this distribution as a “function” as many physicist do is known to be one of the easier ways to annoy mathematicians :)

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.

Thursday, March 24, 2022

Python 3.10.4 and 3.9.12 are now available out of schedule

Did anybody say cursed releases? Well, it turns out that 3.10.3 and 3.9.11 both shipped a regression which caused those versions not to build on Red Hat Enterprise Linux 6. While this 11-year-old version is now out of maintenance support, it’s still used in production workloads. Some of those rely on Python 3.9 and/or 3.10. In particular, our own manylinux2010 image used to build widely compatible Linux wheels is based on CentOS 6. (Don’t worry, we do have newer manylinux* variants, see PEP 599 and PEP 600 for details.)

Due to the out-of-schedule release, the respective versions released today contain a very limited set of changes. Python 3.9.12 only contains 12 other bug fixes on top of 3.9.11. Python 3.10.4 only contains 10 other bug fixes on top of 3.10.3.

Get 3.10.4 here: Python Release Python 3.10.4 | Python.org
Get 3.9.12 here: Python Release Python 3.9.12 | Python.org

Hopefully, the third time’s a charm and we’ll return no sooner than May with the regularly scheduled bug fix releases of 3.9 and 3.10.

We hope you enjoy the new releases

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