Release Notes Verified !!top!! — Python 313

Python 3.13 follows PEP 602's two-year full support policy, with active support until October 2026 and security-only support until October 2029. The first maintenance release (3.13.1) contained over 300 bugfixes, build improvements, and documentation corrections, with subsequent patch releases continuing at roughly two-month intervals.

The default interactive shell has been completely overhauled, based on code from the PyPy project. It now offers features previously only available in third-party tools:

: A preliminary Just-In-Time compiler has been added, laying the groundwork for substantial performance improvements in future versions. Enhanced Interactive Interpreter (REPL) : The default interactive shell now features: Multi-line editing with history preservation. Colorized output for prompts and exception tracebacks. New "Paste Mode" (F3) for easier insertion of large code blocks. Direct support for commands like without needing to call them as functions. Improved Error Messages

author: Leader = 'name': 'Yang Zhou', 'age': 30 author['age'] = 31 # Allowed author['name'] = 'Yang' # Type error: 'name' is read-only python 313 release notes verified

The release notes for Python 3.13 have been verified through a thorough review of the official documentation and testing of the language features. The verification process involved:

Enables running without the GIL, allowing true CPU parallelism.

Python 3.13 adjusts its supported platforms significantly: Python 3

The foundations laid in Python 3.13 will enable the performance breakthroughs planned for 3.14 and 3.15. For now, the release delivers exactly what its official documentation claims: modest improvements, experimental foundations, and a clear roadmap toward a faster, more parallel Python. All information in this article has been cross-referenced against official Python documentation and source code for complete accuracy.

aifc , audioop , cgi , cgitb , chunk , crypt , imghdr , mailcap , msilib , nis , nntplib , ossaudiodev , pipes , sndhdr , spwd , sunau , telnetlib , uu , xdrlib , and lib2to3 .

Python 3.13 addresses long-standing performance architecture paradigms by introducing experimental support for a free-threaded runtime and an entirely new Just-In-Time (JIT) compiler. Free-Threaded CPython (PEP 703) It now offers features previously only available in

This is the first step toward a Just-In-Time (JIT) compiler for CPython.

Python 3.13.0, released on October 7, 2024, marks a pivotal moment in the language's evolution. While maintaining the stability and backward compatibility that production systems demand, this release introduces experimental foundations for a faster and more parallel future. However, this future requires deliberate activation, as the headline features remain .

| Bug Fix | Description | | --- | --- | | Security Fixes | Addressed security vulnerabilities | | Crash Fixes | Resolved crash issues |

: Several long-deprecated legacy modules were officially removed, including New DBM Backend dbm.sqlite3