Python 3.14.0 beta 1 has been released, representing the initial installment of four anticipated beta versions. This release offers the broader community a chance to evaluate new features and address bug fixes, ensuring their projects are ready for the upcoming release. It is recommended that maintainers of third-party Python projects conduct testing with Python 3.14 during the beta phase and report any issues to the Python bug tracker.

The release is scheduled to be feature-complete; however, it may undergo modifications or be removed prior to the release candidate phase. Significant new features encompass deferred evaluation of type annotations, template string literals, and the introduction of the compression.zstd module, syntax highlighting in PyREPL, a zero-overhead external debugger interface for CPython, support for UUID versions 6-8, and enhanced error messages. The upcoming pre-release is version 3.14.0b2, set to be available on May 27, 2025.

Python Insider: Python 3.14.0 beta 1 is here!

Only one day late, welcome to the first beta!

https://www.python.org/downloads/release/python-3140b1/

This is a beta preview of Python 3.14

Python 3.14 is still in development. This release, 3.14.0b1, is the first of four planned beta releases.

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 3.14 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 (Tuesday 2025-07-22). Our goal is to have no ABI changes after beta 4 and as few code changes as possible after the first release candidate. To achieve that, it will be extremely important to get as much exposure for 3.14 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 3.14 series, compared to 3.13

Some of the major new features and changes in Python 3.14 are:

New features

• PEP 649: The evaluation of type annotations is now deferred, improving the semantics of using annotations.
• PEP 750: Template string literals (t-strings) for custom string processing, using the familiar syntax of f-strings.
• PEP 784: A new module compression.zstd providing support for the Zstandard compression algorithm.
• PEP 758: except and except* expressions may now omit the brackets.
• Syntax highlighting in PyREPL, and support for color in  unittest,  argparse,  json and  calendar CLIs.
• PEP 768: A zero-overhead external debugger interface for CPython.
• UUID versions 6-8 are now supported by the uuid module, and generation of versions 3-5 and 8 are up to 40% faster.
• PEP 765: Disallow return/break/continue that exit a finally block.
• PEP 741: An improved C API for configuring Python.
• A  new type of interpreter. For certain newer compilers, this interpreter provides significantly better performance. Opt-in for now, requires building from source.
• Improved error messages.
• Builtin implementation of HMAC with formally verified code from the HACL* project.

(Hey, fellow core developer, if a feature you find important is missing from this list, let Hugo know.)

For more details on the changes to Python 3.14, see  What’s new in Python 3.14. The next pre-release of Python 3.14 will be 3.14.0b2, scheduled for 2025-05-27.

Python Insider: Python 3.14.0 beta 1 is here!