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Python 3.7.0a4

Release Date: Jan. 9, 2018

This is an early developer preview of Python 3.7

Python 3.7 is still in development. This releasee, 3.7.0a4, is the last 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.

Major new features of the 3.7 series, compared to 3.6

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 540, UTF-8 mode
  • PEP 552, Deterministic pyc
  • PEP 560, Core support for typing module and generic types
  • PEP 562, Module __getattr__ and __dir__
  • 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 3.7.0 beta 1, currently scheduled for 2018-01-29.

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 6d1fa014eaf2cb0dd16314f641425290 21786785 SIG
XZ compressed source tarball Source release ec491a4aff3e5faf030d3a7422513960 16386044 SIG
Mac OS X 64-bit/32-bit installer macOS for Mac OS X 10.6 and later d874682b8323abadbd784eb70c186934 28154990 SIG
Windows help file Windows a1a228016cd29c32dc6771e7083cf29f 8227329 SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64, not Itanium processors 90ac964a850bc9bd8cc77ffd33404c3f 6762507 SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64, not Itanium processors 48f3d53bb98e75b689bd04d064db9abe 32254696 SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64, not Itanium processors 46616402934b99b8eac6532841a67e98 1322544 SIG
Windows x86 embeddable zip file Windows d7157b5c5f7aeb14fca5a3e21b7f2747 6204083 SIG
Windows x86 executable installer Windows 01c5d801d2a98874d8450f1ce661ff62 31582016 SIG
Windows x86 web-based installer Windows de288e851c56f66c3d0f16695bd5c4bf 1295128 SIG