: You can now mark TypedDict items as read-only, preventing modification after creation.
test()
The default interactive shell has received a massive overhaul, moving away from the basic prompt to a more productive environment.
iOS and Android are now Tier 3 supported platforms . python 313 release notes verified
If you have questions about specific libraries or how to on your project, I can provide more details.13's free-threaded build ? Python Release Python 3.13.13
Take advantage of the enhanced shell for better debugging, but set PYTHON_BASIC_REPL if you need the old functionality.
For decades, Python's Global Interpreter Lock (GIL) has been the primary obstacle to true multi-threaded parallelism. PEP 703 changes that by introducing an experimental "free-threaded" build of CPython that disables the GIL, allowing threads to run concurrently across multiple CPU cores. As the official documentation notes, this allows for "full utilization of the available processing power by running threads in parallel on available CPU cores". : You can now mark TypedDict items as
Free-threaded CPython represents a major milestone in the language's history, opening the door to true parallelism for CPU-intensive Python applications.
The most significant architectural shift in Python 3.13 is the experimental support for running without the Global Interpreter Lock (GIL). How It Works
| Workload (4 worker threads) | Standard 3.13 | Free-Threaded 3.13 | Speedup | |---|---|---|---| | Mandelbrot computation | 11.2 s | 3.4 s | 3.3x | | SHA-256 of 1GB dataset | 4.1 s | 1.3 s | 3.2x | | Pure-Python regex over 100k strings | 9.8 s | 3.1 s | 3.1x | If you have questions about specific libraries or
: Common tasks like exiting or accessing help no longer require function calls; you can simply type exit , quit , or help .
In the quiet hours of a rainy Tuesday, Alex sat before a glowing terminal, the soft hum of the radiator the only sound in the room. For months, the rumors had been building—whispers of a version that would change everything. Today, the official release notes for Python 3.13 were finally verified.