Python: Asyncio Resilience and Faster Builtins
CPython hardened asyncio servers against connection resets and socket option failures, while moving zip and filter to modern fast-call parsing. Embedding and C extension interfaces also saw crash fixes and limited API additions.
Duration: PT2M31S
Episode overview
This episode is a short developer briefing from Python.
It explains recent repository work in plain language.
- Show: Python
- Published: 2026-11-04T14:09:01Z
- Audio duration: PT2M31S
Transcript excerpt
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Hello, today is November 4th, 2026, and here's your Python developer briefing.
The signal today is operational resilience: keeping servers alive on hostile networks, keeping embedded interpreters alive on edge-case inputs, and trimming overhead from calls you make every day.
First, asyncio learns to tolerate failure. Pull request 161238 keeps Windows proactor servers accepting after a client resets while waiting in the listen queue, turning that platform error into a connection reset and closing only the failed accept socket. Pull request 161253 ignores errors setting the TCP no-delay…
Second, everyday builtins get faster through modernization. Pull request 160944 moves zip to Argument Clinic with vector call support for variable arguments, removing hand-written parsing and tuple and dictionary construction per call. The result is about 22 percent faster for two arguments and nearly twice as fast…
Third, embedding and extension interfaces get safer. Pull request 161258 fixes a crash when passing null to an optional string in the new init config API, with added tests and documentation. Related work exposes the unicode writer to the limited API, adds a new frozen-dict-and-clear…
What's…
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