Developer Guide

Release:

None.0.15.3

Date:

Aug 23, 2026

• Contributors Guide to the Code
  • Module Overview
  • Services
• Partition Assignor
  • Kafka Streams
  • Faust
  • Concerns
• The optional Cython accelerators
  • The cython_optimizations opt-in
  • Testing the compiled code
  • Why parity tests exist
  • Writing an accelerator
• Free-threaded Python (PEP 703)
  • Status
  • Why the .pyx files declare freethreading_compatible
  • Known limitation: aiokafka re-enables the GIL
  • Races that free-threading exposes
  • Working on a free-threaded interpreter