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Python 3.5.0a4

Release Date: April 20, 2015

Python 3.5.0a4

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

Python 3.5.0a4 was released on April 20th, 2015.

Major new features of the 3.5 series, compared to 3.4

Python 3.5 is still in development, and 3.5.0a4 is the fourth and final alpha release. Many new features are still being planned and written. Among the new major new features and changes in the 3.5 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 471, os.scandir()
  • PEP 475, adding support for automatic retries of interrupted system calls
  • PEP 486, making the Windows Python launcher aware of virtual environments
  • PEP 488, eliminating .pyo files

The next release of Python 3.5 will be 3.5.0b1, the first beta release. Python 3.5 will enter "feature freeze" at this time; no new features will be added to 3.5 after this point. Python 3.5.0b1 is scheduled to be released May 22, 2015.

Notes on this release

  • Windows users: if you have previously installed Python 3.5.0a1, you must manually uninstall it before installing Python 3.5.0a4 (issue23612).
  • Windows users: If installing Python 3.5.0a4 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 software 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 34667f07604352a4a1ef4651dcb7f870 19.0 MB SIG
XZ compressed source tarball Source release dd8d2dcb8c8b301d57228be896317612 14.0 MB SIG
Mac OS X 32-bit i386/PPC installer macOS for Mac OS X 10.5 and later c648d4f3f02ce06d839e2b754e8382bc 24.1 MB SIG
Mac OS X 64-bit/32-bit installer macOS for Mac OS X 10.6 and later d7321ddabc46927fd619a694c0d87086 22.5 MB SIG
Windows help file Windows d5434e2cf712ebdf11ede3b6cdb43a64 7.2 MB SIG
Windows amd executable installer Windows 5ca6f1dcc56c66065d874420ae95ea23 28.0 MB SIG
Windows amd64 embeddable installer Windows b2c3001cd03d478293680f88beaf5218 6.4 MB SIG
Windows amd64 web-based installer Windows b2c3001cd03d478293680f88beaf5218 890.6 KB SIG
Windows x86 embeddable installer Windows 32f1d62bc4cad46e5bf3444d648e53f0 5.8 MB SIG
Windows x86 executable installer Windows a220359f4f6cefcc316504cccd3dc0fb 27.1 MB SIG
Windows x86 web-based installer Windows dd6712fe691f4212fb9e516541103721 865.6 KB SIG