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Python 3.12.0a6

Release Date: March 8, 2023

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 to 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

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 worths unknown, although his height be taken.
Loves not Times fool, though rosy lips and cheeks
Within his bending sickles 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 provd,
I never writ, nor no man ever lovd.

Sonnet 116, by William Shakespeare.


Version Operating System Description MD5 Sum File Size GPG Sigstore
Gzipped source tarball Source release 8b5986524d06b208b8cdca8d0411801b 25.2 MB SIG CRT SIG
XZ compressed source tarball Source release 832b1c175bb9982a75dd4a1f8b899675 18.9 MB SIG CRT SIG
macOS 64-bit universal2 installer macOS for macOS 10.9 and later e5dd31509889c630bfecf0a9b70bb3b8 40.6 MB SIG CRT SIG
Windows installer (64-bit) Windows Recommended 171a0ae8f7fb92caaa1ac07312f36815 24.1 MB SIG CRT SIG
Windows installer (32-bit) Windows 337efcc2b41b7d52c5d95b99c0ed3ce8 23.0 MB SIG CRT SIG
Windows installer (ARM64) Windows Experimental 9ce06807e2c96d2b50f4d70be2d04334 23.4 MB SIG CRT SIG
Windows embeddable package (64-bit) Windows dd8436303ec5bf6f6179fa6d34b23c5d 9.7 MB SIG CRT SIG
Windows embeddable package (32-bit) Windows b743a93fb98b8509d7823a34a38a4897 8.7 MB SIG CRT SIG
Windows embeddable package (ARM64) Windows 7d58b2d9779bae73e8945858a491c9c7 9.1 MB SIG CRT SIG