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Python 3.12.0b3

Release Date: June 19, 2023

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 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 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


Version Operating System Description MD5 Sum File Size GPG Sigstore
Gzipped source tarball Source release af32c1622872a39d5a7b49800524632a 25.6 MB SIG .sigstore
XZ compressed source tarball Source release b212ad7fde995ed0f1805e4c4a289bdf 19.3 MB SIG .sigstore
macOS 64-bit universal2 installer macOS for macOS 10.9 and later 650597fda8d5da3180d904ea2887e965 41.9 MB SIG .sigstore
Windows installer (64-bit) Windows Recommended 862b7250b1fe07c3dba03443b0a32ef8 24.5 MB SIG .sigstore
Windows installer (ARM64) Windows Experimental 30d2f1bdd38850b98bbbc994b9d27a4e 23.6 MB SIG .sigstore
Windows embeddable package (64-bit) Windows b7e3a0821c605ea3b90a6a7d39cce505 9.9 MB SIG .sigstore
Windows embeddable package (32-bit) Windows f444c46a4004b3d0cbee71ae5259880c 8.9 MB SIG .sigstore
Windows embeddable package (ARM64) Windows d17bc0edc479686f66d0d48280b91932 9.1 MB SIG .sigstore
Windows installer (32 -bit) Windows ec5d34da4bba54a17951f39230f8fbc4 23.4 MB SIG .sigstore