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Python 3.7.4rc2

Release Date: July 2, 2019

Python 3.7.4rc2 is the second release candidate preview of the fourth 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.

Note that 3.7.4rc2 is a release preview and thus its use is not recommended for production environments.

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

  • Changed in 3.7.4 OpenSSL has been updated from 1.1.0 to 1.1.1 and SQLite updated to 3.28.0.
  • 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

  • Changed in 3.7.4 OpenSSL has been updated from 1.1.0 to 1.1.1 and SQLite updated to 3.28.0.
  • For Python 3.7.4, 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. Changed in 3.7.4 The 64-bit/32-bit variant that also works on very old versions of macOS, from 10.6 (Snow Leopard) on, is now deprecated and will no longer be provided in future releases; see the macOS installer ReadMe file for more info. Both variants 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.
  • Both installer variants include private copies of OpenSSL. 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 01f8b4ae74aabb278486221260effb53 22.0 MB SIG
XZ compressed source tarball Source release 041c4b0fc02fde539750d3abacbe0b55 16.3 MB SIG
macOS 64-bit installer macOS for OS X 10.9 and later fb824b76f16d0843fcfb7a6618192c92 26.8 MB SIG
macOS 64-bit/32-bit installer macOS for Mac OS X 10.6 and later 24dc8a9b63ef07c72ee6e6d3c92cd03e 33.3 MB SIG
Windows help file Windows ecbaf171452e7f75dbe3509ae1be91a3 7.8 MB SIG
Windows x86 embeddable zip file Windows ee80b2302cbc8fd5cae290ce1fc47c73 6.4 MB SIG
Windows x86 executable installer Windows 1d37745c5141468e4459ccf5b668bbc5 24.5 MB SIG
Windows x86 web-based installer Windows 47c3ce08f6d67ac99a98848f9428f701 1.3 MB SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64 b87bb12b8b74e960affe8634f9c30818 7.2 MB SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64 d8086b92d6d834176ced083b04393c25 25.5 MB SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64 5488857b879692b9a33a3fdf763b675d 1.3 MB SIG