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  • Python 3.4.0 Release Candidate 2 Release

    ...hash algorithm for Python strings and binary data PEP 3154, a new and improved protocol for pickled objects PEP 3156, a new "asyncio" module, a new framework for asynchronous I/O More resources Online Documentation 3.4 Release Schedule Report bugs at http://bugs.python.org. Help fund Python and its community. Download This is a preview release, and its use is not recommended in production settings. We currently support these formats for download: XZ compressed source tar ball ...

  • Release – Python 3.3.4

    Version: None

    Released: Feb. 9, 2014

    fixes several security and a lot of overall bug fixes found in Python 3.3.3. This release fully supports OS X 10.9 Mavericks. In particular, this release fixes an issue that could cause previous versions of Python to crash when typing in interactive mode on OS X 10.9. …

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  • Release – Python 3.3.1

    Version: None

    Released: April 6, 2013

    release. It includes hundreds of bugfixes over 3.3.0. Major new features of the 3.3 series, compared to 3.2 Python 3.3 includes a range of improvements of the 3.x series, as well as easier porting between 2.x and 3.x. PEP 380, syntax for delegating …

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  • Release – Python 3.3.2

    Version: None

    Released: May 15, 2013

    regressions <http://docs.python.org/release/3.3.2/whatsnew/changelog.html>`_ found in Python 3.3.1. Major new features of the 3.3 series, compared to 3.2 Python 3.3 includes a range of improvements of the 3.x series, as well as easier porting between 2.x and 3.x. PEP 380, syntax for delegating …

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  • Release – Python 3.3.3

    Version: None

    Released: Nov. 17, 2013

    fixes several security issues and various other bugs found in Python 3.3.2. This release fully supports OS X 10.9 Mavericks. In particular, this release fixes an issue that could cause previous versions of Python to crash when typing in interactive mode on OS X 10.9. Major …

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  • Release – Python 3.14.0b1

    Version: None

    Released: May 7, 2025

    Only one day late, welcome to the first beta! This is a beta preview of Python 3.14 Python 3.14 is still in development. This release, 3.14.0b1, is the first of four planned beta releases. Beta release previews are intended to give the wider community the opportunity to …

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  • Release – Python 3.14.0b4

    Version: None

    Released: July 8, 2025

    It's the final 3.14 beta! https://www.python.org/downloads/release/python-3140b4/ This is a beta preview of Python 3.14 Python 3.14 is still in development. This release, 3.14.0b4, is the last of four planned beta releases. Beta release previews are intended to give the wider community the opportunity to test new …

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  • Release – Python 3.14.0rc2

    Version: None

    Released: Aug. 14, 2025

    It's the final 🪄 penultimate 🪄 3.14 release candidate! Note: rc2 was originally planned for 2025-08-26, but we fixed a bug that required bumping the magic number stored in Python bytecode (.pyc) files. This means .pyc files created for rc1 cannot be used for rc2, and they'll …

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  • Release – Python 3.14.0rc3

    Version: None

    Released: Sept. 18, 2025

    It's 🪄 finally 🪄 the final 3.14 release candidate! Note: It's another magic release. We fixed another bug that required bumping the magic number stored in Python bytecode (.pyc) files. This means file .pyc files created for rc2 cannot be used for rc3, and they'll be recompiled. …

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  • Known bugs in Python 2.2.1

    ...hash order of dict items is different than in previous versions. (No code should rely on this order, but it's easy to forget this.) <p><li>Assignment to __debug__ raises SyntaxError at compile-time. <p><li>The UTF-16 codec was modified to be more RFC compliant. It will now only remove BOM characters at the start of the string and then only if running in native mode (UTF-16-LE and -BE won't remove a leading BMO character). <p><li>Many error messages are differ...

  • Incompatibilities between Python 2.1[.x] and 2.2[.x]

    ...hash order of dict items is different than in previous versions. (No code should rely on this order, but it's easy to forget this.) <p><li>Assignment to __debug__ raises SyntaxError at compile-time. <p><li>The UTF-16 codec was modified to be more RFC compliant. It will now only remove BOM characters at the start of the string and then only if running in native mode (UTF-16-LE and -BE won't remove a leading BMO character). <p><li>Many error messages are differ...

  • Python 3.3.0 Release

    ...Hash randomization, introduced in earlier bugfix releases, is now switched on by default See these resources for further information: What's new in 3.3? 3.3 Release Schedule Change log for this release. Online Documentation Report bugs at http://bugs.python.org. Help fund Python and its community. Download This is a production release. Please report any bugs you encounter. We currently support these formats for download: Bzipped source tar ball (3.3.0) (sig), ~ 14 MB XZ compressed source...

  • Python 3.3.1 Release

    ...Hash randomization, introduced in earlier bugfix releases, is now switched on by default More resources Change log for this release. Online Documentation What's new in 3.3? 3.3 Release Schedule Report bugs at http://bugs.python.org. Help fund Python and its community. Download This is a production release. Please report any bugs you encounter. We currently support these formats for download: Bzipped source tar ball (3.3.1) (sig), ~ 14 MB XZ compressed source tar ball (3.3.1) (sig), ~ 1...

  • Python 3.3.2 Release

    ...Hash randomization, introduced in earlier bugfix releases, is now switched on by default More resources Change log for this release. Online Documentation What's new in 3.3? 3.3 Release Schedule Report bugs at http://bugs.python.org. Help fund Python and its community. Download This is a production release. Please report any bugs you encounter. We currently support these formats for download: Bzipped source tar ball (3.3.2) (sig), ~ 14 MB XZ compressed source tar ball (3.3.2) (sig), ~ 1...

  • Python 3.3.3 Release

    ...Hash randomization, introduced in earlier bugfix releases, is now switched on by default More resources Change log for this release. Online Documentation What's new in 3.3? 3.3 Release Schedule Report bugs at http://bugs.python.org. Help fund Python and its community. Download This is a production release. Please report any bugs you encounter. We currently support these formats for download: Bzipped source tar ball (3.3.3) (sig), ~ 14 MB XZ compressed source tar ball (3.3.3) (sig), ~ 11...

  • Python 3.3.4 Release

    ...Hash randomization, introduced in earlier bugfix releases, is now switched on by default More resources Change log for this release. Online Documentation What's new in 3.3? 3.3 Release Schedule Report bugs at http://bugs.python.org. Help fund Python and its community. Download This is a production release. Please report any bugs you encounter. We support these formats for download: XZ compressed source tar ball (3.3.4) (sig), ~ 11 MB Gzipped source tar ball (3.3.4) (sig), ~ 16 MB Wi...

  • Release – Python 3.14.0b2

    Version: None

    Released: May 26, 2025

    Here's the second 3.14 beta. https://www.python.org/downloads/release/python-3140b2/ This is a beta preview of Python 3.14 Python 3.14 is still in development. This release, 3.14.0b2, is the first of four planned beta releases. Beta release previews are intended to give the wider community the opportunity to test new …

    View Release Notes

  • Incompatibilities between Python 2.1[.x] and 2.2[.x]

    ...hash order of dict items is different than in previous versions. (No code should rely on this order, but it's easy to forget this.) <p><li>Assignment to __debug__ raises SyntaxError at compile-time. <p><li>The UTF-16 codec was modified to be more RFC compliant. It will now only remove BOM characters at the start of the string and then only if running in native mode (UTF-16-LE and -BE won't remove a leading BMO character). <p><li>Many error messages are differ...

  • Python Patterns - An Optimization Anecdote

    ...hash chaining works. The second reason why f3() is faster than f1() is that the call to chr(item), as executed by the bytecode interpreter, is probably a bit slower than when executed by the map() function - the bytecode interpreter must execute three bytecode instructions for each call (load 'chr', load 'item', call), while the map() function does it all in C. This led us to consider a compromise, which wouldn't waste extra space, but which would speed up the lookup for the chr(...

  • Known bugs in Python 2.2

    ...hash order of dict items is different than in previous versions. (No code should rely on this order, but it's easy to forget this.) <p><li>Assignment to __debug__ raises SyntaxError at compile-time. <p><li>The UTF-16 codec was modified to be more RFC compliant. It will now only remove BOM characters at the start of the string and then only if running in native mode (UTF-16-LE and -BE won't remove a leading BMO character). <p><li>Many error messages are differ...

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