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Python 3.6.3rc1

Release Date: 2017-09-19

Python 3.6.3rc1 is a release candidate preview of the third maintenance release of Python 3.6. The Python 3.6 series contains many new features and optimizations. See the What’s New In Python 3.6 document for more information.

Major new features of the 3.6 series, compared to 3.5

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

Note that 3.6.3rc1 is a preview release and thus its use is not recommended for production environments.

More resources

Notes on this release

  • 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".)
  • Windows users: 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.
  • 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.
  • macOS users: If you are using the Python 3.6 from the python.org binary installer linked 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.
  • macOS users: There is important information about IDLE, Tkinter, and Tcl/Tk on macOS here.

Full Changelog

Files

Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release 1b8c52cd948d2143ce4b1ea5123b7f2d 22674172 SIG
XZ compressed source tarball Source release 70b5e2986f0e3cca5334205108b2793e 16970160 SIG
Mac OS X 64-bit/32-bit installer Mac OS X for Mac OS X 10.6 and later 25bfc253ecbe0dbd27dfe39c45fe7a5c 27696162 SIG
Windows help file Windows d411ca39f6193589f1f44c60ffbd862d 8020770 SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64, not Itanium processors 3fe3b7f8ae21370d3f363feb5442d5ba 7146352 SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64, not Itanium processors 5a3ff092062a0fd33b79122594b46859 31616976 SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64, not Itanium processors d8f725afe86bd4d32ce8c19278c6346c 1312856 SIG
Windows x86 embeddable zip file Windows 337014bf4b11971f9e7edabcc3403a3f 6387918 SIG
Windows x86 executable installer Windows f9ee5040c299452a28a7fb81e71d008c 30586592 SIG
Windows x86 web-based installer Windows eef44f9aaa3f723954cbff2a3ee3bf70 1287456 SIG