Python: C Safety Fixes and Version APIs
CPython activity centers on C-level memory safety and object-lifetime fixes, plus consistent structured version info across native extensions. Backports for asyncio, memory-map, and free-threading stability carry the most immediate developer impact.
Duration: PT2M39S
Episode overview
This episode is a short developer briefing from Python.
It explains recent repository work in plain language.
- Show: Python
- Published: 2026-09-29T13:15:29Z
- Audio duration: PT2M39S
Transcript excerpt
This excerpt keeps the crawler page concise. Listen to the episode or use the RSS feed for the full update.
Good morning, it's Tuesday, September 29th, 2026, and this is your Python briefing.
The big signal is hardening under the hood in C, paired with cleaner version reporting from C extensions.
First, memory and object lifetime fixes. PR 158329 stops the bytearray constructor from reusing a bytes object that already has a cached hash, closing a mutability bug that could break hashing assumptions. Related work in commit 24ea85a fixes error handling in the internal bytes writer and its empty bytearray case,…
Second, consistent version introspection. Serhiy Storchaka landed structured version info across S S L, Tkinter, SQLite, PyExpat, Readline and G D B M. PR 157515 makes OpenSSL version info a named tuple and adds separate build-time A P I version info. Matching commits add Tickell and Tee Kay version info, SQLite…
Finally, concurrency and runtime edge cases. PR 157785 backports a fix for asyncio hanging when an eager task fails to start, PRs 158011 and 158012 merge biased reference counts on behalf of detached threads for free-threaded builds, and open work on the just-in-time compiler corrects which stack slot dict guards…
What's next to watch is backports landing on 3.15 and 3.14, and…
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