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Python 3.7.0b4

Release Date: May 2, 2018

This is a beta preview of Python 3.7

Python 3.7 is still in development. This release, 3.7.0b4, is the final planned beta release preview.

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 included prior to the release candidate.

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 is 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 preview of Python 3.7 will be 3.7.0 release candidate, currently scheduled for 2018-05-21. 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

  • For 3.7.0, we are providing two binary installer options for download. The new preferred variant is 64-bit-only and works on macOS 10.9 (Mavericks) and later systems. We also continue to provide a 64-bit/32-bit variant that works on all versions of macOS from 10.6 (Snow Leopard) on. Both variants now come with batteries-included versions oF Tcl/Tk 8.6 for users of IDLE and other tkinter-based GUI applications; third-party and system versions of Tcl/Tk are no longer used. Consider using the new 10.9 64-bit-only installer variant, unless you are building Python applications that also need to work on older macOS systems.
  • Both installer variants include private copies of OpenSSL 1.1.0. Please carefully read the Important Information displayed during installation for information about SSL/TLS certificate validation and the Install Certificates.command.

Full Changelog


Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release e6acaacef2bb920d1a25f3e4f732e1f2 21.1 MB SIG
XZ compressed source tarball Source release a9860cd8eeafcf7e36c789fe70857df5 15.9 MB SIG
macOS 64-bit installer macOS for OS X 10.9 and later fcdb551264e98d9a82b2093a5149220e 26.3 MB SIG
macOS 64-bit/32-bit installer macOS for Mac OS X 10.6 and later 23923aa5d1ca99b081845a3ce98a60ea 32.6 MB SIG
Windows help file Windows 372fbdd3c693ef0f229da097b1f5d341 8.0 MB SIG
Windows x86 embeddable zip file Windows 59e4c9bf316634e117c43d29a40e54f6 6.1 MB SIG
Windows x86 executable installer Windows 6803af03ed8cd889432e3fc3b252ee32 24.5 MB SIG
Windows x86 web-based installer Windows 0c56037a00bb807e44df1aa64ce364da 1.2 MB SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64 975c084795a6e84aecc66c3cf358a55c 6.7 MB SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64 106810c62138bda8489a9096ceb694c6 25.3 MB SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64 b8cd439d3c3ec30b97251a787566198a 1.3 MB SIG