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Python 3.5.0a3

Release Date: March 30, 2015

Python 3.5.0a3

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

Python 3.5.0a3 was released on March 30th, 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 second 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
  • PEP 471, os.scandir()


Notes on this release:

  • Windows users: if you have previously installed Python 3.5.0a1, you must manually uninstall it before installing Python 3.5.0a3 (issue23612).
  • Windows users: If installing Python 3.5.0a3 as a non-privileged user, you may need to escalate to administrator privileges to install an update to your C runtime libraries.
  • 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 5521bdf9ae9af5b794cd65477bcb02a3 19945010 SIG
XZ compressed source tarball Source release 4c5e7119a07edcc640527c3eaa8aa7e1 14779596 SIG
Mac OS X 32-bit i386/PPC installer macOS for Mac OS X 10.5 and later 5aeead5d0813b30fe97b2d94f52d4a41 25345137 SIG
Mac OS X 64-bit/32-bit installer macOS for Mac OS X 10.6 and later 9c37e366c05133ff5337dcf84cf7c6de 23682167 SIG
Windows help file Windows dbb48cfc59b9f4d072b532c69ff0309b 7596582
Windows x86-64 executable installer Windows for AMD64/EM64T/x64 b0e42578749fc46018345c43f01352c0 28888960
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64 25b4e4d355bc4649608c8ae3e4bee910 911944
Windows x86 executable installer Windows 40ad08b3f94f8962a7ec5909f4ff4eaf 28166488
Windows x86 web-based installer Windows e5c7a6e77052280d309fa3702f96bce5 886336