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Python 3.5.0a1

Release Date: Feb. 8, 2015

Python 3.5.0a1

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

Python 3.5.0a1 was released on February 8th, 2015.

Major new features of the 3.5 series, compared to 3.4

Python 3.5 is still in development, and 3.5.0a1 is the first alpha release. Many new features are still being planned and written. Among the new major new features and changes in the 3.4 release series so far are

  • PEP 461, adding support for "%-formatting" for bytes and bytearray objects
  • PEP 465, a new operator (@) for matrix multiplication
  • PEP 475, adding support for automatic retries of interrupted system calls


Notes on this release:

  • The OS X installers are now distributed as signed installer package files compatible with the OS X Gatekeeper security feature.
  • There are now "web-based" installers for Windows platforms; the installer does not contain Python, but instead downloads just the needed su at installation time.
  • The Windows binaries were built with Microsoft Visual Studio 2015, which is not yet officially released. (It's currently offered in "Preview" mode, which is akin to a "beta".) It is our intention to ship Python 3.5 using VS2015, although right now VS2015's final release date is unclear.
  • 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").
  • There is important information about IDLE, Tkinter, and Tcl/Tk on Mac OS X here.

Full Changelog


Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release f1ea32ce88ffff8787ea31302e00b05a 19.0 MB SIG
XZ compressed source tarball Source release 3113a8138146bdc71f4eb328130f601b 14.0 MB SIG
Mac OS X 32-bit i386/PPC installer macOS for Mac OS X 10.5 and later db2cc92ee6b231716a690900d80eaa65 24.0 MB SIG
Mac OS X 64-bit/32-bit installer macOS for Mac OS X 10.6 and later 81282502c8a5c04e9efb64b24ae106b3 22.5 MB SIG
Windows help file Windows e306ad10de67f9823d53c8b8b5eb736a 7.2 MB
Windows x86 executable installer Windows d8457a909f1d2d5711f245df00725640 21.1 MB
Windows x86 web-based installer Windows 05e061e417cf311534c8a17ddc943c2b 869.6 KB
Windows x86-64 executable installer Windows for AMD64/EM64T/x64 e62c943c1ebf9143bef93b51671a11d9 21.8 MB
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64 34e88bb7ee92706371160dd29b2f3f75 894.8 KB