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Python 3.7.1rc2

Release Date: 2018-10-13

Python 3.7.1rc2 is the second release candidate preview of the first maintenance release of Python 3.7. The Python 3.7 series is the newest major release of the Python language and contains many new features and optimizations.

Among the major new features in Python 3.7 are:

  • PEP 539, new C API for thread-local storage
  • PEP 545, Python documentation translations
  • New documentation translations: Japanese, French, and Korean.
  • PEP 552, Deterministic pyc files
  • PEP 553, Built-in breakpoint()
  • PEP 557, Data Classes
  • PEP 560, Core support for typing module and generic types
  • PEP 562, Customization of access to module attributes
  • PEP 563, Postponed evaluation of annotations
  • PEP 564, Time functions with nanosecond resolution
  • PEP 565, Improved DeprecationWarning handling
  • PEP 567, Context Variables
  • Avoiding the use of ASCII as a default text encoding (PEP 538, legacy C locale coercion and PEP 540, forced UTF-8 runtime mode)
  • The insertion-order preservation nature of dict objects is now an official part of the Python language spec.
  • Notable performance improvements in many areas.

Please see What’s New In Python 3.7 for more information. Note that 3.7.1rc2 is a preview release and thus 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, we provide two binary installer options for download. The default 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 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 c1a8efb9de931b84629baf68fd828a74 22805187 SIG
XZ compressed source tarball Source release 352db477565d72ba4c0eac5237f6f1ab 16974832 SIG
macOS 64-bit/32-bit installer Mac OS X for Mac OS X 10.6 and later bb18636b9b34fd5431565844de64df46 34360620 SIG
macOS 64-bit installer Mac OS X for OS X 10.9 and later 53724096a741a8d5e1966b290613a16d 27725108 SIG
Windows help file Windows a1b25e65de6b5f9f811670169b69e116 8536074 SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64 04a461eb9ba01001bdab6bb381bb7265 6937555 SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64 15305e25f8aaabb40d750c1c18806cd7 26297880 SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64 47766a2cdcaa792f132daa8003bd0f43 1328144 SIG
Windows x86 embeddable zip file Windows 7be2c630bd0ce4f34fde8ec8ffa6d547 6399840 SIG
Windows x86 executable installer Windows c816763403c54072a2a840ae21209d01 25550664 SIG
Windows x86 web-based installer Windows b336915d0880792eda00480a49cc592d 1299088 SIG