| Version | Change log |
| Python 3.13.5 Jun 12, 2025 |
3.13.5 is an expedited release to fix a couple of significant issues with the 3.13.4 release: gh-135151: Building extension modules on Windows for the regular (non-free-threaded) build failed. gh-135171: Generator expressions stopped raising TypeError (when iterating over non-iterable objects) at creation time, delaying it to first use. gh-135326: Passing int-like objects (like numpy.int64) to random.getrandbits() failed, when it worked before. Several other bug fixes (which would otherwise have waited until the next release) are also included. |
| Python 3.13.2 Feb 5, 2025 |
Security content in this release: gh-126623: Upgraded libexpat to 2.6.4 to fix CVE-2024-50602. gh-122792: Changed IPv4-mapped ipaddress.IPv6Address to consistently use the mapped IPv4 address value for deciding properties. Properties which have their behavior fixed are is_multicast, is_reserved, is_link_local, is_global, and is_unspecified. gh-124651: Properly quote template strings in venv activation scripts. gh-125140: Remove the current directory from sys.path when using PyREPL. New features: A new and improved interactive interpreter, based on PyPy's, featuring multi-line editing and color support, as well as colorized exception tracebacks. An experimental free-threaded build mode, which disables the Global Interpreter Lock, allowing threads to run more concurrently. The build mode is available as an experimental feature in the Windows and macOS installers as well. A preliminary, experimental JIT, providing the ground work for significant performance improvements. The locals() builtin function (and its C equivalent) now has well-defined semantics when mutating the returned mapping, which allows debuggers to operate more consistently. A modified version of mimalloc is now included, optional but enabled by default if supported by the platform, and required for the free-threaded build mode. Docstrings now have their leading indentation stripped, reducing memory use and the size of .pyc files. (Most tools handling docstrings already strip leading indentation.) The dbm module has a new dbm.sqlite3 backend that is used by default when creating new files. The minimum supported macOS version was changed from 10.9 to 10.13 (High Sierra). Older macOS versions will not be supported going forward. WASI is now a Tier 2 supported platform. Emscripten is no longer an officially supported platform (but Pyodide continues to support Emscripten). iOS is now a Tier 3 supported platform. Android is now a Tier 3 supported platform. Typing: Support for type defaults in type parameters |
| Python 3.13.1 Dec 4, 2024 |
Security content in this release: gh-126623: Upgraded libexpat to 2.6.4 to fix CVE-2024-50602. gh-122792: Changed IPv4-mapped ipaddress.IPv6Address to consistently use the mapped IPv4 address value for deciding properties. Properties which have their behavior fixed are is_multicast, is_reserved, is_link_local, is_global, and is_unspecified. gh-124651: Properly quote template strings in venv activation scripts. gh-125140: Remove the current directory from sys.path when using PyREPL. New features: A new and improved interactive interpreter, based on PyPy's, featuring multi-line editing and color support, as well as colorized exception tracebacks. An experimental free-threaded build mode, which disables the Global Interpreter Lock, allowing threads to run more concurrently. The build mode is available as an experimental feature in the Windows and macOS installers as well. A preliminary, experimental JIT, providing the ground work for significant performance improvements. The locals() builtin function (and its C equivalent) now has well-defined semantics when mutating the returned mapping, which allows debuggers to operate more consistently. A modified version of mimalloc is now included, optional but enabled by default if supported by the platform, and required for the free-threaded build mode. Docstrings now have their leading indentation stripped, reducing memory use and the size of .pyc files. (Most tools handling docstrings already strip leading indentation.) The dbm module has a new dbm.sqlite3 backend that is used by default when creating new files. The minimum supported macOS version was changed from 10.9 to 10.13 (High Sierra). Older macOS versions will not be supported going forward. WASI is now a Tier 2 supported platform. Emscripten is no longer an officially supported platform (but Pyodide continues to support Emscripten). iOS is now a Tier 3 supported platform. Android is now a Tier 3 supported platform. Typing: Support for type defaults in type parameters |
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