Python 3.14 Released With Performance Improvements, Free-Threading & Zstd

Python 3.14 is now available as the newest annual major feature release for the Python programming language.

Python 3.14 delivers on official support for the free-threaded Python code path, a new Zstd compression module, various performance improvements, a zero-overhead external debugger for Python, C API improvements, enhanced error messages a new opt-in interpreter, and many other enhancements.

- PEP 779: Free-threaded Python is officially supported
- PEP 649: The evaluation of 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 734: Multiple interpreters in the stdlib.
- 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 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.
- A new command-line interface to inspect running Python processes using asynchronous tasks.
- The pdb module now supports remote attaching to a running Python process.

Downloads and more details on the major Python 3.14 feature release via Python.org.