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Python 3.5.3rc1

Release Date: 2017-01-03

Python 3.5.3 release candidate 1

Python 3.5.3 release candidate 1 was released on January 2nd, 2017.

Major new features of the 3.5 series, compared to 3.4

Among the new major new features and changes in the 3.5 release series are

  • PEP 441, improved Python zip application support
  • PEP 448, additional unpacking generalizations
  • PEP 461, "%-formatting" for bytes and bytearray objects
  • PEP 465, a new operator (@) for matrix multiplication
  • PEP 471, os.scandir(), a fast new directory traversal function
  • PEP 475, adding support for automatic retries of interrupted system calls
  • PEP 479, change StopIteration handling inside generators
  • PEP 484, the typing module, a new standard for type annotations
  • PEP 485, math.isclose(), a function for testing approximate equality
  • PEP 486, making the Windows Python launcher aware of virtual environments
  • PEP 488, eliminating .pyo files
  • PEP 489, a new and improved mechanism for loading extension modules
  • PEP 492, coroutines with async and await syntax

Notes on this release

  • 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.

Full Changelog


Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release ddf165b3156e6e3deea71a3e3ee293d1 20655623 SIG
XZ compressed source tarball Source release 1d53fc82cd0b06b34eed1b84ce296847 15309192 SIG
Mac OS X 32-bit i386/PPC installer Mac OS X for Mac OS X 10.5 and later 5e9be3abb85606439e119d463b352258 26385450 SIG
Mac OS X 64-bit/32-bit installer Mac OS X for Mac OS X 10.6 and later 0e1e27d5b56348202e364a09299d3fe5 24751140 SIG
Windows help file Windows 24876c1881753b1bd727fddfbcd36886 7819033 SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64, not Itanium processors b5f22550e4037c0b3f7a1aee1fabea1c 6913433 SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64, not Itanium processors c00a2b36ba12b4f6f5fdc2e87f0be253 30325184 SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64, not Itanium processors c823e644b2e2152729ad3c8698e44011 974392 SIG
Windows x86 embeddable zip file Windows 57697c6d604852f5d25f3f40b2aec9f9 6088015 SIG
Windows x86 executable installer Windows d976da2359961811e43cfaef94fedeee 29410184 SIG
Windows x86 web-based installer Windows f9c4b872e22d1ba266a1e2b8b702b416 949016 SIG