Python 3.13 is a recommended upgrade for most developers, with the JIT delivering free speed. The no-GIL build is a sneak peek of Python's parallel future – use it for new CPU-bound projects, but don't migrate production GIL-reliant systems yet.
# Improved type hinting def greet(name: str) -> None: print(f"Hello, name!") python 3.13 release news 2025 november
def worker(num: int) -> None: print(f"Worker num started") # Do some work print(f"Worker num finished") Python 3
A 4-thread CPU-bound task (prime sieve) scaled to 3.8x on an 8-core M2 MacBook Air. name!") def worker(num: int) ->