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Python 3.7.3rc1

Release Date: March 12, 2019

Python 3.7.3rc1 is the release candidate preview of the third 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.

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 Python 3.7 releases, 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 newer 10.9 64-bit-only installer variant, unless you are building Python applications that also need to work on older macOS systems.
  • Both python.org 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

Files

Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release 52d3ac4eae7663073a2914cb60d6ec59 22973877 SIG
XZ compressed source tarball Source release 0f829f6257e32e6fa807f26bc7db4018 17106464 SIG
macOS 64-bit/32-bit installer Mac OS X for Mac OS X 10.6 and later 6882a8b0ecf0be3e28202b1c98d18d13 34479523 SIG
macOS 64-bit installer Mac OS X for OS X 10.9 and later fff6ecd2943e63d32fc3e011b2e32a90 27843988 SIG
Windows help file Windows 6ef5165c8f1cba7bf56ac1363f727813 8087634 SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64 44cd223a30cd39de5ce9958f71af5b9c 7019029 SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64 f52a9dad92a6ef66b4fe9c46e612216e 26188120 SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64 f3010d74f73082729c95cf1067c1f473 1363024 SIG
Windows x86 embeddable zip file Windows f800a5cb3d154885650067c94a838a66 6526592 SIG
Windows x86 executable installer Windows 85542faf758734f25af323d5528feee1 25419648 SIG
Windows x86 web-based installer Windows 6bf8a86a83f069e0bd066ce99c3016f1 1325256 SIG