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Python 3.7.0a3

Release Date: Dec. 5, 2017

This is an early developer preview of Python 3.7

Major new features of the 3.7 series, compared to 3.6

Python 3.7 is still in development. This releasee, 3.7.0a3, is the third of four planned alpha releases. Alpha releases are intended to make it easier to test the current state of new features and bug fixes and to test the release process. During the alpha phase, features may be added up until the start of the beta phase (2018-01-29) and, if necessary, may be modified or deleted up until the release candidate (2018-05-21) . Please keep in mind that this is a preview release and its use is not recommended for production environments.

Many new features for Python 3.7 are still being planned and written. Among the new major new features and changes so far:

  • PEP 538, Coercing the legacy C locale to a UTF-8 based locale
  • PEP 539, A New C-API for Thread-Local Storage in CPython
  • PEP 553, Built-in breakpoint()
  • PEP 557, Data Classes
  • PEP 564, Time functions with nanosecond resolution

The next pre-release of Python 3.7 will be 3.7.0a4, currently scheduled for 2018-01-08.

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 3.7 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 3.7 from the 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 3.7/ReadMe.rtf. There is important information there about changes in the 3.7 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


Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release 9bc05846b2ca88cf849349b471b8e826 20.7 MB SIG
XZ compressed source tarball Source release 0d73fc046d19871fdaf3845dabb641eb 15.6 MB SIG
Mac OS X 64-bit/32-bit installer macOS for Mac OS X 10.6 and later b60cc0db8c56e229e1420ae99a0da397 26.7 MB SIG
Windows help file Windows 31c201582f15a371789847be286842fd 7.8 MB SIG
Windows x86 embeddable zip file Windows 47e294fcd150c89009a8b481b4445dce 5.9 MB SIG
Windows x86 executable installer Windows a5c3f976c94bf7cf24028a28e28093e7 30.0 MB SIG
Windows x86 web-based installer Windows cdd4530989acb378f8a63bfe8f0a0b74 1.2 MB SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64, not Itanium processors 1710426e0a257fe813529b9f8266db56 6.4 MB SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64, not Itanium processors fcc230ed17f0c410c015ef5ab014ac29 30.7 MB SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64, not Itanium processors 9be96d4e92ecb61fdd66fe41c31fe59c 1.3 MB SIG