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Python 3.7.0a2

Release Date: 2017-10-17

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, 3.7.0a2, is the second 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()

The next pre-release of Python 3.7 will be 3.7.0a3, currently scheduled for 2017-11-27.

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 a5b3bb04b526dc646e716afd500b7b56 21641959 SIG
XZ compressed source tarball Source release 670c9e719d1b483c236e3973373abec5 16277732 SIG
Mac OS X 64-bit/32-bit installer Mac OS X for Mac OS X 10.6 and later f0f47aed0c9ef3bb0870d31932fff11d 27868252 SIG
Windows help file Windows 6730da5df562e426ba5dc71d729e114b 8128045 SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64, not Itanium processors 8833ddbae6ffca7ebda746f67e6e93d5 6709779 SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64, not Itanium processors 4087053925c9c918575bcb8cbe7eb2bb 32008248 SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64, not Itanium processors 3d83c8cada81876fee5c5c0ccf2242d4 1315040 SIG
Windows x86 embeddable zip file Windows d1a290bdc0b31906e8750e7bdf90fb1d 6151853 SIG
Windows x86 executable installer Windows 39db022a42c23f4d9878f0139025fe5b 31329968 SIG
Windows x86 web-based installer Windows 05010b72ae5acff25c00f2300ac2bc90 1288312 SIG