Specifically, if you maintain C-extensions, you need to pay close attention to the free-threaded build. While it is experimental, ensuring your code runs without the safety net of the GIL is a critical step toward future-proofing your packages.
Python 3.13.0 release candidate 1 (Code hardening begins).
The interactive interpreter (REPL) received a massive overhaul. It now features: Multi-line editing. Colorized prompts and tracebacks. Built-in help and history browsing. Paste mode for large code blocks. 3. Just-In-Time (JIT) Compiler (PEP 744)