Python 3.14 brings template string literals, free-threading, and stdlib subinterpreters

Python 3.14 is now the latest stable release, bringing substantial changes to the programming language, its implementation, and core libraries. Major updates include the introduction of template string literals, deferred evaluation for type annotations, and official support for subinterpreters in the standard library. Free-threaded Python is also now officially supported, unlocking new concurrency and parallelism possibilities for application developers.

Building on these headline features, developers will benefit from enhanced introspection capabilities in the asyncio module and the addition of a compression.zstd module, which enables Zstandard algorithm support out of the box. The read-eval-print loop (REPL) also gains syntax highlighting, while deprecations and removals continue to refine the language and improve usability for users at all experience levels.

In addition, multiple interpreters are now available directly in the standard library. Command-line tools such as unittest, argparse, json, and calendar gain color support, improving output clarity. For those developing external tools, CPython now offers a zero-overhead debugger interface, and the C API has been upgraded to streamline configuration. The uuid module extends support to versions 6 through 8, and also accelerates the generation of versions 3 through 5 by up to 40%. As always, this release also introduces several other enhancements and bug fixes.