Key enhancements in Python 3.14 include:
- Free-threaded Python support
- Deferred evaluation of type annotations
- Template string literals
- Multiple interpreters in the standard library
- Introduction of Zstandard compression
- Syntax highlighting in the Python REPL
- A zero-overhead external debugger interface for CPython
- Support for UUID versions 6 to 8
- New restrictions on return/break/continue statements within finally blocks
- Enhancements to the C API for Python configuration
- A new interpreter type
- Improved error messaging
- Built-in HMAC implementation with verified code from the HACL project
- A command-line interface for inspecting running Python processes with asynchronous tasks
- Support from the pdb module for remote attachment to running processes
As this version is still in development, it is critical for developers to conduct thorough testing. While the release aims to be feature-complete, there may still be adjustments prior to the release candidate phase, scheduled for July 22, 2025. The goal is to avoid any Application Binary Interface (ABI) changes after this beta version and to limit code changes after the initial release candidate.
To facilitate broader testing, pre-release wheels for Python 3.14 are being created, allowing other projects to test compatibility. However, it is advised that organizations refrain from using this beta for production releases until the first release candidate is available, to mitigate the risk of ABI issues.
In summary, Python 3.14.0 Beta 4 offers a variety of new features and improvements, and community engagement during this testing phase is crucial for a smooth transition to the final release
Python 3.14.0 Beta 4 released
Python 3.14.0 beta 4 represents the concluding version of Python 3.14, marking the end of the four scheduled beta releases. This release is designed to offer the broader community the chance to evaluate new features, address bug fixes, and prepare their projects for the upcoming feature launch. It is recommended that maintainers of third-party Python projects conduct testing with Python 3.14 during the beta phase and report any identified issues to the Python bug tracker. The objective is to ensure there are no ABI changes following beta 4 and to minimize code modifications after the initial release candidate.
Significant enhancements in Python 3.14 encompass support for free-threaded Python, deferred evaluation of type annotations, template string literals, multiple interpreters in the standard library, and the introduction of a new module for compression. The significant enhancements in Python 3.14 include Zstandard compression, syntax highlighting in the Python REPL, a zero-overhead external debugger interface for CPython, support for UUID versions 6 to 8, restrictions on return/break/continue statements that exit a finally block, enhancements to the C API for Python configuration, the introduction of a new interpreter type, improved error messaging, a built-in implementation of HMAC with formally verified code from the HACL* project, a new command-line interface for inspecting running Python processes using asynchronous tasks, and support from the pdb module for remote attachment to a running Python process.
