Yeah, another Python 3.11 alpha release! The asyncore, asynchat and smtpd modules are back into Python 3.11! They were removed but the removal has been reverted to respect the PEP 387 process: have two Python versions (3.10 and 3.11) emitting a DeprecationWarning. In general, I strongly advice you running your project and its test suite with "python3 -W default" or PYTHONWARNINGS=default environment variable to see DeprecationWarning and PendingDeprecationWarning, or even "python3 -W error" or PYTHONWARNINGS=error to treat warnings as errors. You can also try the development mode which shows these warnings, and more, use "python3 -X dev" or PYTHONDEVMODE=1: https://docs.python.org/dev/library/devmode.html Victor On Thu, Dec 9, 2021 at 12:52 AM Pablo Galindo Salgado <pablogsal@gmail.com> wrote:

You can tell that we are slowly getting closer to the first beta as the number of release blockers that we need to fix on every release starts to increase But we did it! Thanks to Steve Dower, Ned Deily, Christian Heimes, Łukasz Langa and Mark Shannon that helped get things ready for this release :)

Go get the new version here:

https://www.python.org/downloads/release/python-3110a3/

**This is an early developer preview of Python 3.11**

# Major new features of the 3.11 series, compared to 3.10

Python 3.11 is still in development. This release, 3.11.0a3 is the third 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 (2022-05-06) and, if necessary, may be modified or deleted up until the release candidate phase (2022-08-01). Please keep in mind that this is a preview release and its use is **not** recommended for production environments.

Many new features for Python 3.11 are still being planned and written. Among the new major new features and changes so far:

* [PEP 657](https://www.python.org/dev/peps/pep-0657/) -- Include Fine-Grained Error Locations in Tracebacks * [PEP 654](https://www.python.org/dev/peps/pep-0654/) -- Exception Groups and except* * The [Faster Cpython Project](https://github.com/faster-cpython) is already yielding some exciting results: this version of CPython 3.11 is ~12% faster on the geometric mean of the [PyPerformance benchmarks](speed.python.org), compared to 3.10.0. * Hey, **fellow core developer,** if a feature you find important is missing from this list, let me know.

The next pre-release of Python 3.11 will be 3.11.0a4, currently scheduled for Monday, 2022-01-03.

# More resources

* [Online Documentation](https://docs.python.org/3.11/) * [PEP 664](https://www.python.org/dev/peps/pep-0664/), 3.11 Release Schedule * Report bugs at [https://bugs.python.org](https://bugs.python.org). * [Help fund Python and its community](/psf/donations/).

# And now for something completely different

Rayleigh scattering, named after the nineteenth-century British physicist Lord Rayleigh is the predominantly elastic scattering of light or other electromagnetic radiation by particles much smaller than the wavelength of the radiation. For light frequencies well below the resonance frequency of the scattering particle, the amount of scattering is inversely proportional to the fourth power of the wavelength. Rayleigh scattering results from the electric polarizability of the particles. The oscillating electric field of a light wave acts on the charges within a particle, causing them to move at the same frequency. The particle, therefore, becomes a small radiating dipole whose radiation we see as scattered light. The particles may be individual atoms or molecules; it can occur when light travels through transparent solids and liquids but is most prominently seen in gases.

The strong wavelength dependence of the scattering means that shorter (blue) wavelengths are scattered more strongly than longer (red) wavelengths. This results in the indirect blue light coming from all regions of the sky.

# We hope you enjoy those 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.

Your friendly release team, Pablo Galindo @pablogsal Ned Deily @nad Steve Dower @steve.dower _______________________________________________ python-committers mailing list -- python-committers@python.org To unsubscribe send an email to python-committers-leave@python.org https://mail.python.org/mailman3/lists/python-committers.python.org/ Message archived at https://mail.python.org/archives/list/python-committers@python.org/message/U... Code of Conduct: https://www.python.org/psf/codeofconduct/

-- Night gathers, and now my watch begins. It shall not end until my death.