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Python 3.5.4rc1

Release Date: 2017-07-25

Python 3.5.4rc1

Python 3.5.4rc1 was released on July 25th, 2017.

Python 3.5.4 will be the last "bugfixes" release of 3.5. After 3.5.4 final is released, 3.5 will enter "security fixes only" mode, and as such the only improvements made in the 3.5 branch will be security fixes.

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 19fc1fa04f1e765cc0deb72de88cc739 20751209 SIG
XZ compressed source tarball Source release 8d1fd76bf4e48adfdeb0d072b16bbaac 15368932 SIG
Mac OS X 32-bit i386/PPC installer Mac OS X for Mac OS X 10.5 and later c28fccde04319df7c62941c1a5b884b2 26594338 SIG
Mac OS X 64-bit/32-bit installer Mac OS X for Mac OS X 10.6 and later f47b442d4123efda64bfc3e26bdf9717 24902706 SIG
Windows help file Windows 74168c21390c6ea69181510cf78fde79 7531495 SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64 0d7c8310c571f8e5a7a379fbe0f0379d 6934350 SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64 8299638fbc3c23d7ca2104698fc985c6 29870512 SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64 d37d0c92b4c6d308359f1edbdba4eed1 974376 SIG
Windows x86 embeddable zip file Windows fb8bbadfc13125e56fbc9c98efa2ab25 6104286 SIG
Windows x86 executable installer Windows 0b73e345afbad3fe7ad39889110e407b 28955672 SIG
Windows x86 web-based installer Windows f082766b6695a980abf0e45226073ecb 949040 SIG