Python 3.5.10rc1

Python 3.5 has reached end-of-life. Python 3.5.10, the final release of the 3.5 series, is available here.

Python 3.5.10rc1 was released on August 21st, 2020.

Python 3.5 has now entered "security fixes only" mode, and as such the only changes since Python 3.5.4 are security fixes. Also, Python 3.5.10rc1 has only been released in source code form; no more official binary installers will be produced.

Notes on this release

• The latest releases of Linux (Ubuntu 20.04, Fedora 32) ship with a new version of OpenSSL. New versions of OpenSSL often include upgraded configuration requirements to maintain network security; this new version no longer finds Python 3.5's OpenSSL configuration acceptable. As a result, most or all secure-transport networking libraries are broken in this release on systems where this new version of OpenSSL is deployed. This means, for example, that seven (7) of the regression tests in the test suite now regularly fail. Older versions of Linux, with older versions of OpenSSL installed, are unaffected. We're aware of the problem. Unfortunately, as 3.5 is nearly completely out of support, it has become very low priority, and we've been unable to find the resources to get the problem fixed. It's possible that these problems simply won't be fixed in 3.5 before it reaches its end-of-life. As always we recommend upgrading to the latest Python release wherever possible.
• The binaries for AMD64 will also work on processors that implement the Intel 64 architecture. (Also known as the "x64" architecture, and formerly known as both "EM64T" and "x86-64".) They will not work on Intel Itanium Processors (formerly "IA-64").
• Windows users: If installing Python 3.5.1 as a non-privileged user, you may need to escalate to administrator privileges to install an update to your C runtime libraries.
• Windows users: There are now "web-based" installers for Windows platforms; the installer will download the needed software components at installation time.
• Windows users: There are redistributable zip files containing the Windows builds, making it easy to redistribute Python as part of another software package. Please see the documentation regarding Embedded Distribution for more information.
• Windows users: Some virus scanners (most notably "Microsoft Security Essentials") are flagging "Lib/distutils/command/wininst-14.0.exe" as malware. This is a "false positive": the file does not contain any malware. We build it ourselves, from source, on a known-clean system. We've asked that this false positive report be removed, and expect action soon. In the meantime, please don't be alarmed to see this warning when installing Python 3.5.2, or when scanning any earlier version of 3.5.
• OS X users: The OS X installers are now distributed as signed installer package files compatible with the OS X Gatekeeper security feature.
• OS X users: There is important information about IDLE, Tkinter, and Tcl/Tk on Mac OS X here.