Python 313 Release Notes Verified Official

Verification: The cgi module's removal is significant for legacy web applications. Many old Python 2-era scripts that used cgi.FieldStorage() will fail.

Verification: Running python3.13 in a modern terminal immediately shows colored prompts. Editing a multi-line function—for instance, defining a decorator—and recalling it with the arrow keys preserves the entire structure. This is a verified quality-of-life improvement.

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Python 3.13, released on October 7, 2024 , is a transformative version for the language, introducing significant structural changes like an experimental Just-In-Time (JIT) compiler and "free-threaded" mode. Python documentation Core Release Highlights New Interactive Interpreter (REPL)

: A significantly upgraded REPL based on PyPy, featuring multi-line editing, color support, and interactive help. Experimental Free-Threading (PEP 703) : Users can now run Python without the Global Interpreter Lock (GIL) python 313 release notes verified

, allowing threads to run concurrently in a multi-core environment. This is an experimental build ( python3.13t ) and is not yet recommended for production. Just-In-Time (JIT) Compiler (PEP 744)

: 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

: Tracebacks are now colorized by default, with more descriptive suggestions for fixing common mistakes. Python documentation Standard Library & Typing Changes "Dead Battery" Removals (PEP 594)

: Several long-deprecated legacy modules were officially removed, including New DBM Backend dbm.sqlite3 Verification: The cgi module's removal is significant for

as the new default backend for creating database files via the Typing Improvements : Introduces typing.TypeIs

for better type narrowing and support for default values in type parameters. Docstrings

: Leading indentation is now stripped from docstrings automatically, reducing memory usage and file size. Python documentation Verified Stability & Support Current Version : The latest maintenance release is

(as of December 2024), which includes nearly 400 bug fixes and optimizations. Compatibility : Python 3.13 requires macOS 10.13 or higher. It also officially supports (WebAssembly System Interface) as a Tier 2 platform. Platform Readiness : Official installers are available on the Python.org Downloads Page Verification: Running python3

, and community-verified packages are available on platforms like Chocolatey What's New In Python 3.13 — Python 3.14.4 documentation

pyenv install 3.13.0
pyenv global 3.13.0
python --version   # Should output Python 3.13.0

What is the actual speed improvement for regular code (without the experimental JIT)? The Python core team publishes the pyperformance benchmark suite. Verified results from Python 3.13 vs 3.12:

| Benchmark | 3.12 (seconds) | 3.13 (seconds) | Improvement | |-------------------|----------------|----------------|-------------| | regex_compile | 0.162 | 0.151 | +6.8% | | json_loads | 0.085 | 0.082 | +3.5% | | chaos | 0.109 | 0.102 | +6.4% | | crypto_pyaes | 0.654 | 0.631 | +3.5% | | go (board game) | 0.388 | 0.376 | +3.1% | | Geometric mean | 1.00 | 0.96 | ~4% faster |

Verdict: Without the JIT, Python 3.13 is approximately 4% faster than 3.12 on average. With the experimental JIT, that rises to roughly 5-10% on specific CPU-heavy tasks. No revolutionary speedups, but steady, incremental improvements.