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Python 3.7.0rc1

Release Date: June 11, 2018

This is the release candidate of Python 3.7.0

This release, 3.7.0rc1, is the final planned release preview. Assuming no critical problems are found prior to 2018-06-27, the scheduled release date for 3.7.0, no code changes are planned between this release candidate and the final release.

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.

This release candidate is intended to give the wider community the opportunity to test the new features and bug fixes in 3.7.0 and to prepare their projects to support it. We strongly encourage maintainers of third-party Python projects to test with the 3.7.0 release candidate and report issues found to the Python bug tracker as soon as possible. Please keep in mind that this release candidate is still a preview release and, as such, its use is not recommended for production environments.

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 97c461bb339888f16d524cece9d27021 22705833 SIG
XZ compressed source tarball Source release de8b44e3c94d0144768e923b6ab87c53 16922324 SIG
macOS 64-bit/32-bit installer macOS for Mac OS X 10.6 and later 0ce2399f27adc0fa9e49b04d0664c2fc 34225340 SIG
macOS 64-bit installer macOS for OS X 10.9 and later 7e39c15f830bdedd8d960ff65da92d44 27602099 SIG
Windows help file Windows eb72c51a5160fd01ae53ff260885ab86 8481128 SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64 51379841e99329250301caa0a51225aa 6945613 SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64 7a9f4b7d84ff0550677dd8adf605fe1c 26191712 SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64 90a0d62e6a9a19f39c9fb72844c2746d 1327800 SIG
Windows x86 embeddable zip file Windows b8c344fc180ad393d729c22f8329e879 6396175 SIG
Windows x86 executable installer Windows 5f6947e1699f531848b1154e93141033 25435656 SIG
Windows x86 web-based installer Windows c1024c825f3610321c93352560888cff 1298896 SIG