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Python 3.6.6rc1

Release Date: 2018-06-12

Python 3.6.6rc1 is a release candidate preview of the sixth maintenance release of Python 3.6. The Python 3.6 series contains many new features and optimizations.

Among the new major new features in Python 3.6 are:

  • PEP 468, Preserving Keyword Argument Order
  • PEP 487, Simpler customization of class creation
  • PEP 495, Local Time Disambiguation
  • PEP 498, Literal String Formatting
  • PEP 506, Adding A Secrets Module To The Standard Library
  • PEP 509, Add a private version to dict
  • PEP 515, Underscores in Numeric Literals
  • PEP 519, Adding a file system path protocol
  • PEP 520, Preserving Class Attribute Definition Order
  • PEP 523, Adding a frame evaluation API to CPython
  • PEP 524, Make os.urandom() blocking on Linux (during system startup)
  • PEP 525, Asynchronous Generators (provisional)
  • PEP 526, Syntax for Variable Annotations (provisional)
  • PEP 528, Change Windows console encoding to UTF-8
  • PEP 529, Change Windows filesystem encoding to UTF-8
  • PEP 530, Asynchronous Comprehensions

Please see What’s New In Python 3.6 for more information. Note that 3.6.6rc1 is a preview release and thus its use is not recommended for production environments.

More resources

Windows users

  • 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".)
  • If installing Python 3.6 as a non-privileged user, you may need to escalate to administrator privileges to install an update to your C runtime libraries.
  • There are now "web-based" installers for Windows platforms; the installer will download the needed software components at installation time.
  • 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.

macOS users

  • NEW as of 3.6.5: we are providing two binary installer options for download. The new variant works on macOS 10.9 (Mavericks) and later systems and comes with its own batteries-included version oF Tcl/Tk 8.6 for users of IDLE and other tkinter-based GUI applications. It is 64-bit only as Apple is deprecating 32-bit support in future macOS releases. For 3.6.6, the 10.9+ variant is offered as an additional more modern alternative to the traditional 10.6+ variant in earlier 3.6.x releases. The 10.6+ variant still requires installing a third-party version of Tcl/Tk 8.5. If you are using macOS 10.9 or later, consider using the new installer variant, unless you are building Python applications that also need to work on older macOS systems. Binary extension modules (including wheels) built for earlier versions of 3.6.x with the 10.6 variant should continue to work with either 3.6.6 variant without recompilation.
  • If you are using Python 3.6.6 from one of the python.org binary installers linked to on this page, please carefully read the Important Information displayed during installation; this information is also available after installation by clicking on /Applications/Python 3.6/ReadMe.rtf. There is important information there about changes in the 3.6 installer-supplied Python, particularly with regard to SSL certificate validation.

Full Changelog

Files

Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release 6a9a8e4dc807126ea429e3814bbcb8ae 22935299 SIG
XZ compressed source tarball Source release d030795bfd781b081b0d9f7f46f075e3 17145456 SIG
macOS 64-bit/32-bit installer Mac OS X for Mac OS X 10.6 and later dbf8a4d9b83f676df6bebc3551dfe87c 28060883 SIG
macOS 64-bit installer Mac OS X for OS X 10.9 and later 2e5c13274256f014ce34f308749f7a3d 26954935 SIG
Windows help file Windows f5a2b220fb12a947169d8ad32bd9877b 8138842 SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64 cfe6ee9275c38795da31743db5c57153 7185468 SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64 21a6c5759c602753b171e52d24a9a821 31927480 SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64 1421e1455bc865a87b5ba5ecca52e7d4 1320240 SIG
Windows x86 embeddable zip file Windows ac7ff0ce8de336a0b475251447a4eb8c 6401280 SIG
Windows x86 executable installer Windows 81cf5bc1ffef5e8add829a5205a1963c 30880064 SIG
Windows x86 web-based installer Windows 5b399d15f430a6e63135d24ad3ae4130 1294224 SIG