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Python 3.7.0b1

Release Date: Jan. 31, 2018

This is a beta preview of Python 3.7

Python 3.7 is still in development. This release, 3.7.0b1, is the first of four planned beta release previews.

Among the major new features in Python 3.7 are:

  • 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 553, Built-in breakpoint()
  • PEP 557, Data Classes
  • PEP 560, Core support for typing module and generic types
  • PEP 562, Module __getattr__ and __dir__
  • PEP 563, Postponed Evaluation of Annotations
  • PEP 564, Time functions with nanosecond resolution
  • PEP 565, Show DeprecationWarning in __main__
  • PEP 567, Context Variables

Please see What’s New In Python 3.7 for more information. Additional documentation for these features and other changes will be updated during the beta phase.

Beta release previews are intended to give the wider community the opportunity to test new features and bug fixes and to prepare their projects to support the new feature release. We strongly encourage maintainers of third-party Python projects to test with 3.7 during the beta phase and report issues found to the Python bug tracker as soon as possible. While the release is planned to be feature complete entering the beta phase, it is possible that features may be modified or, in rare cases, deleted up until the start of the release candidate phase (2018-05-21). Our goal is have no ABI changes after beta 3 and no code changes after 3.7.0rc1, the release candidate. To achieve that, it will be extremely important to get as much exposure for 3.7 as possible during the beta phase. Please keep in mind that this is a preview release and its use is not recommended for production environments.

The next pre-release of Python 3.7 will be 3.7.0 beta 2, currently scheduled for 2018-02-26. The official release of 3.7.0 is planned for 2018-06-15.

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 3.7 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 with this release (3.7.b1), 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. We also continue to provide the traditional variant that works on all versions of macOS from 10.6 (Snow Leopard) on. This 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.
  • If you are using the Python 3.7 from one of the 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 3.7/ReadMe.rtf. There is important information there about changes in the 3.7 installer-supplied Python, particularly with regard to SSL certificate validation.

Full Changelog


Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release b55f1edab8b23dc011c95d4857cf3356 21932393 SIG
XZ compressed source tarball Source release 0d973587e62fbdfbb710de4a05489ae1 16478848 SIG
macOS 64-bit/32-bit installer macOS for Mac OS X 10.6 and later 2c824401d754b164e3bd7a08e7bfdcd0 28773474 SIG
macOS 64-bit installer macOS for OS X 10.9 and later 43730a0a67dc4a458063f21e6a267484 27274339 SIG
Windows help file Windows 8598d7fb0cc0940fc52275e8fdd05476 8262381 SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64 788d2bc636fa9c00c1195419ee2f9ae8 6780246 SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64 5525c247c1e4b7ff7987dde6d99c680c 26005496 SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64 8790ddedad4e1292a8f2d6cb64c671d5 1321448 SIG
Windows x86 embeddable zip file Windows f69caaa0a0e91f1cce3fa3db2ef341ea 6220867 SIG
Windows x86 executable installer Windows 39e28b1fb88873f9b6a533ab0b8bd18b 25337736 SIG
Windows x86 web-based installer Windows d66dc9eec52cd695a3f02cd3b7fcaae9 1294040 SIG