Several critical bugs affecting the experimental JIT were resolved, including improper stack frame handling when deoptimizing compiled code back to the interpreter. These fixes reduce segmentation faults in long-running applications that rely on dynamic code generation, such as template engines and ORM query builders.
Python 3.13: Cool New Features for You to Try * An Improved Interactive Interpreter (REPL) * Better Error Messages. * Free-Threade... Real Python Python Release Python 3.13.7 Removals and new deprecations * PEP 594 (Removing dead batteries from the standard library) scheduled removals of many deprecated ... Python.org Python documentation by version Python 3.13 * Python 3.13.13, released on 7 April 2026. * Python 3.13.12, released on 3 February 2026. * Python 3.13.11, released ... Python.org Summary of Major Changes Between Python Versions Oct 4, 2024 — python 3.13.1 released oct 2025
Developers testing the --disable-gil build reported race conditions in the asyncio event loop and the weakref module. Version 3.13.1 introduces additional locking primitives and memory barrier instructions, making thread-safe operations more reliable without sacrificing the performance gains of GIL-free execution. Several critical bugs affecting the experimental JIT were
The new interactive interpreter (REPL) features multi-line editing, color support, and much friendlier error messages. * Free-Threade