Python » PEP Index » PEP 703 Toggle light / dark / auto colour theme Author : Sam Gross <colesbury at gmail.com> Sponsor : Łukasz Langa <lukasz at python.org> Discussions-To : Discourse thread Status : Draft Type : Standards Track Created : 09-Jan-2023 Python-Version : 3.13 Post-History : 09-Jan-2023 , 04-May-2023 Resolution : Table of Contents Abstract Motivation The GIL Makes Many Types of Parallelism Difficult to Express The GIL Affects Python Library Usability GPU-Heavy Workloads Require Multi-Core Processing The GIL Makes Deploying Python AI Models Difficult Motivation Summary Specification Build Configuration Changes Overview of CPython Changes Reference Counting Immortalization Biased Reference Counting Default ( 0b00 ) Weakrefs ( 0b01 ) Queued ( 0b10 ) Merged ( 0b11 ) Reference counting pseudo-code Deferred ...