Python 313 Release Notes Verified
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Following the long-standing deprecation schedules outlined across PEP 594 , Python 3.13 completely removes multiple obsolete and legacy modules from the base installer package. Removed Module Modern Alternative/Status 2to3
: A "copy-and-patch" JIT is included to provide the foundation for future performance gains. It is currently disabled by default and offers modest improvements in this initial stage. Improved Error Messages
: While still experimental and deactivated by default, it compiles hot bytecode loops into native machine instructions. python 313 release notes verified
: It integrates a modified version of mimalloc to manage thread-safe, lock-free memory operations efficiently. Experimental Just-In-Time (JIT) Compiler (PEP 744)
Continuing the work of the "Faster CPython" initiative, 3.13 introduces a .
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Before diving into technical changes, Python 3.13 brings a strategic shift for its own lifecycle. The release cycle policy, originally defined in PEP 602 (Annual Release Cycle for Python), has been updated. The full support, or "bugfix," period for new releases has been extended to two years, giving developers and organizations more time to plan and execute their upgrade strategies without feeling rushed. This change underscores a commitment to stability as the language embarks on a journey of more aggressive performance experimentation.
The help() system has been improved, and simple commands like exit and quit now work without needing parentheses. 2. Experimental Free-Threaded Mode (No-GIL)
as the new default backend for creating database files via the Typing Improvements : Introduces typing.TypeIs : It integrates a modified version of mimalloc
For decades, Python relied completely on a Global Interpreter Lock (GIL) to prevent multiple execution threads from handling raw Python bytecodes simultaneously. PEP 703 introduces an alternative, experimental build configuration that completely .
Verified: A copy-and-patch JIT compiler is added behind a build flag ( --enable-experimental-jit ). Reality: Not a speed miracle yet. It translates bytecode to machine code at runtime, but initial benchmarks show modest gains (5–15% in some loops). The foundation is laid — expect major improvements in 3.14.
PEP 703 – Making the Global Interpreter Lock Optional (Experimental)