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Python 3.7.0b3

Release Date: March 29, 2018

This is a beta preview of Python 3.7

Python 3.7 is still in development. This release, 3.7.0b3, is the third 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 4, currently scheduled for 2018-04-30. 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".)
  • 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/CHANGED as of 3.7.0b1: 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. As of 3.7.0 b3, this variant also comes with its own batteries-included version oF Tcl/Tk 8.6. 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 9250b20ac03ea65c0d09733bbd6a76d9 22254354 SIG
XZ compressed source tarball Source release 1a9dca37ccfddea7b9f9ee65789e7036 16575572 SIG
macOS 64-bit/32-bit installer macOS for Mac OS X 10.6 and later a29894b76465ff83dbef766710af63ba 34221245 SIG
macOS 64-bit installer macOS for OS X 10.9 and later ccbadafdf818fc24805d6c75fccc87d1 27634862 SIG
Windows help file Windows 711473920b14a2b90d9859759479fd6a 8360385 SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64 ddf4f01f1eb167d0e8f0716c6f0931d6 6919831 SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64 9cc4e0ac3f1e5d6a92c483c00033c78b 26379816 SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64 ce0a613516186490249faa8f1a505088 1328744 SIG
Windows x86 embeddable zip file Windows 16e59f1977be7273552c290fd3f5eaba 6369714 SIG
Windows x86 executable installer Windows 026ae4fb4a930806b272ec100630bc85 25631840 SIG
Windows x86 web-based installer Windows a5d560419e1e63d4e885ca1e37224f9e 1298504 SIG