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Python 3.12.0b4

Release Date: July 11, 2023

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 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

Files

Version Operating System Description MD5 Sum File Size GPG Sigstore
Gzipped source tarball Source release 36cc16b07557916f50eab03c026979ec 26851750 SIG .sigstore
XZ compressed source tarball Source release 7823c953fa3288bbd2b60171ec2b2aad 20244176 SIG .sigstore
macOS 64-bit universal2 installer macOS for macOS 10.9 and later d4a25c1ae5ce689b4c3e6dc901ba99a7 43936972 SIG .sigstore
Windows embeddable package (32-bit) Windows b958d12caf2cc6b9e4aba384a993c3c0 9352669 SIG .sigstore
Windows embeddable package (64-bit) Windows e960f02af289f016ba4f4319574889bd 10425207 SIG .sigstore
Windows embeddable package (ARM64) Windows cd949831346c4bf85e72c9d5f3cc3617 9617441 SIG .sigstore
Windows installer (32 -bit) Windows 2b162b6f5e7868527a61742774ef1923 24499144 SIG .sigstore
Windows installer (64-bit) Windows Recommended b3f49b8b8a2deddda40105ce128ea0fc 25735240 SIG .sigstore
Windows installer (ARM64) Windows Experimental bca108ac43a4d5a92b379d47f0322a62 24816912 SIG .sigstore