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  • Python Software Foundation: Missing 1023 form

    ...c inspection for three years after the due date of the return. You can charge only a reasonable fee for reproduction and actual postage costs for the copied materials. The law does not require you to provide copies of public inspection documents that are widely available, such as by posting them on the Internet (World Wide Web). You may be liable for a penalty of $20 a day for each day you do not make these documents available for public inspection (up to a maximum of $10,000 in the case...

  • Release – Python 3.13.4

    Version: None

    Released: June 3, 2025

    This is the fourth maintenance release of Python 3.13 Python 3.13 is the newest major release of the Python programming language, and it contains many new features and optimizations compared to Python 3.12. 3.13.4 is the latest maintenance release, containing a few important security fixes as well as around 300 …

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  • Release – Python 3.13.11

    Version: None

    Released: Dec. 5, 2025

    This is the eleventh maintenance release of Python 3.13 Note: This is Python 3.13.11, a maintenance release for Python 3.13. Python 3.14 is now the latest feature release series of Python 3. Get the latest release of 3.14.x here. Python 3.13.11 is the eleventh maintenance release of 3.13. This …

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  • Python Success Stories

    ...ch a distinctive function. Application Server component architecture Zoom in Client Side The client runs a small software stack. This stack consists of a core and one or more toolkits. The toolkits form the interface between the Operating System of the client and the Client core. Backend The backend does the actual application processing and stores most of the application data and the entire state of the applications. The backend therefore is the place where the real action takes place. Th...

  • Debugging Reference Count Problems

    ...ch is to try and make sure that you have the right INCREF and DECREF calls at each place -- and the only way to go is to know (from the manual) the reference count behavior of each function you call (including functions you wrote yourself!). 3) If I comment out all the DECREF calls, I should only have to worry about objects that I've created which don't have reference counts? So, if I add an incref everywhere a new object is created, I should have a huge memory leak, but no stack cor...

  • Python Success Stories

    ...cations are rarely CPU bound, and simply do not need the intensive performance that the fastest languages can give you. For interactive desktop applications, the speed difference between C# and IronPython would rarely be discernible by the user. Some programs do require significant CPU performance, either because they are crunching large data sets or because they must scale across many users on a server. In such a project, it is often a very small proportion of the code which actually requires t...

  • Ancient Releases

    ...cient Releases Andrew Dalke was clever and persistent enough to scrape Python 0.9.1 out of the Usenet alt.sources archives and assemble a compressed tarball. It's here mostly as a historical relic. If you want a compiled binary (on Linux) you can install it with conda (ideally in its own conda environment): conda install -c davidmertz python=0.9 Skip Montanaro has created a GitHub repository of Python 0.9.1 source.

  • Matching Donations

    ...ch is a public charity classified as exempt under section 501(c)(3) of the Internal Revenue Code. How to donate and have your company match In a few simple steps, you can see if your company offers a matching gift program. Make a contribution to the PSF here. Check with your company's Human Resources or Accounting department about matching gift programs for 501(c)(3) nonprofits like the Python Software Foundation. Your company's Human Resources or Accounting Department will l...

  • Release – Python 3.9.3

    Version: None

    Released: April 2, 2021

    This is the third maintenance release of Python 3.9 NOTE: The release you're looking at has been recalled due to unintentional breakage of ABI compatibility with C extensions built in Python 3.9.0 - 3.9.2. Details in bpo-43710. Please use Python 3.9.4 or newer instead. Python 3.9.3 is an …

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  • Release – Python 3.13.0rc3

    Version: None

    Released: Oct. 1, 2024

    This is the third release candidate of Python 3.13.0 This release, 3.13.0rc3, is the final release preview (no really) of 3.13. This release is expected to become the final 3.13.0 release, barring any critical bugs being discovered. The official release of 3.13.0 is now scheduled for Monday, 2024-10-07. This …

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  • Release – Python 3.13.1

    Version: None

    Released: Dec. 3, 2024

    This is the first maintenance release of Python 3.13 Python 3.13 is the newest major release of the Python programming language, and it contains many new features and optimizations compared to Python 3.12. 3.13.1 is the latest maintenance release, containing almost 400 bugfixes, build improvements and documentation changes since 3.13.0. …

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  • Python Success Stories

    ...ct family, which focuses on the Tower and Airport Tools segment of Air Traffic Control. These tools are used by air traffic controllers to track weather conditions, control runway lighting, and to monitor and control navigational aid instruments. TAPtools® products display runway and weather conditions for air traffic controllers managing the approach of incoming aircraft Zoom in A Brief History One of the problems in developing air traffic control solutions is that each customer's unique a...

  • 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 features and bug fixes …

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  • Python Success Stories

    ...consistent use of a few basic concepts, like namespaces, help to make Python code readable and maintainable. Extensive and easy to use introspection facilities make Python easy to learn interactively by discovering its capabilities, including documentation, from the command prompt. Python is readily extensible in C or C++, so it is easy to incorporate non-Python modules into an application. Python has played an important role in the success of LivingLogic AG, and will continue to be the basis ...

  • Python Software Foundation Public Records

    ...c Records Incorporation Here is a transcript of the Articles of Incorporation. Bylaws Here are the PSF Bylaws. Board of Directors PSF Board Members & Officers Resolutions Meeting Minutes Python Software Foundation Policies: Conflict of Interest Policy Whistleblower Policy Python.org Email Policy PSF Staff Current staff IRS recognition of tax exempt status The PSF is a United States 501(c)(3) corporation domiciled in Delaware. Final determination letter from the IRS, May...

  • Release – Python 3.7.0a1

    Version: None

    Released: Sept. 19, 2017

    This is an early developer preview of Python 3.7 Major new features of the 3.7 series, compared to 3.6 Python 3.7 is still in development. This releasee, 3.7.0a1 is the first of four planned alpha releases. Alpha releases are intended to make it easier to test the current state of …

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  • Release – Python 3.14.0a4

    Version: None

    Released: Jan. 14, 2025

    Hello, three dot fourteen dot zero alpha four! This is an early developer preview of Python 3.14 Major new features of the 3.14 series, compared to 3.13 Python 3.14 is still in development. This release, 3.14.0a4, is the fourth of seven planned alpha releases. Alpha releases are intended to make …

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  • Release – Python 3.14.0b3

    Version: None

    Released: June 17, 2025

    It's 3.14 beta 3! https://www.python.org/downloads/release/python-3140b3/ This is a beta preview of Python 3.14 Python 3.14 is still in development. This release, 3.14.0b3, is the third of four planned beta releases. Beta release previews are intended to give the wider community the opportunity to test new features and bug fixes and …

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  • Release – Python 3.14.0

    Version: None

    Released: Oct. 7, 2025

    This is the stable release of Python 3.14.0 Python 3.14.0 is the newest major release of the Python programming language, and it contains many new features and optimisations compared to Python 3.13. Major new features of the 3.14 series, compared to 3.13 Some of the major new features and changes …

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  • Release – Python 3.14.2

    Version: None

    Released: Dec. 5, 2025

    This is the second maintenance release of Python 3.14 Python 3.14.2 is the second maintenance release of 3.14, containing 18 bugfixes, build improvements and documentation changes since 3.14.1. This is an expedited release to fix the following regressions: gh-142206: Exceptions in multiprocessing in running programs while upgrading Python. gh-142214 …

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