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Python 3.7.1rc1

Release Date: Sept. 26, 2018

Python 3.7.1rc1 is a 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 3.7.1rc1 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 b99cf438ebe665ed9afc6e56c187acb2 22800318 SIG
XZ compressed source tarball Source release 91012b2063a5f143bc2d805bdbf5613b 16968876 SIG
macOS 64-bit/32-bit installer macOS for Mac OS X 10.6 and later 4b72fc57f0b82410c91bfd15a20250d1 34352311 SIG
macOS 64-bit installer macOS for OS X 10.9 and later faf380ce6aaad6d4e5653bced0e729d8 27716791 SIG
Windows help file Windows eabd80b848319d324a78764679f505e0 8529144 SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64 4bb576586319959c85c9d36a25d05a82 6938990 SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64 b8892b03f1b4fb183947de9f86899bd4 26288016 SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64 1a90367925d71f511d17b222c55597de 1328128 SIG
Windows x86 embeddable zip file Windows 0dec7ed63626c2f93bac023379e82bf5 6400583 SIG
Windows x86 executable installer Windows e2122d4ca7e8834cc3a9c63e447407cb 25540392 SIG
Windows x86 web-based installer Windows 5395a59784820ac5419596f8c6628024 1299088 SIG