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Python 3.8.2rc2

Release Date: Feb. 17, 2020

This is the second release candidate of Python 3.8.2, the second maintenance release of Python 3.8

The Python 3.8 series is the newest major release of the Python programming language, and it contains many new features and optimizations.

Major new features of the 3.8 series, compared to 3.7

  • PEP 572, Assignment expressions
  • PEP 570, Positional-only arguments
  • PEP 587, Python Initialization Configuration (improved embedding)
  • PEP 590, Vectorcall: a fast calling protocol for CPython
  • PEP 578, Runtime audit hooks
  • PEP 574, Pickle protocol 5 with out-of-band data
  • Typing-related: PEP 591 (Final qualifier), PEP 586 (Literal types), and PEP 589 (TypedDict)
  • Parallel filesystem cache for compiled bytecode
  • Debug builds share ABI as release builds
  • f-strings support a handy = specifier for debugging
  • continue is now legal in finally: blocks
  • on Windows, the default asyncio event loop is now ProactorEventLoop
  • on macOS, the spawn start method is now used by default in multiprocessing
  • multiprocessing can now use shared memory segments to avoid pickling costs between processes
  • typed_ast is merged back to CPython
  • LOAD_GLOBAL is now 40% faster
  • pickle now uses Protocol 4 by default, improving performance

There are many other interesting changes, please consult the "What's New" page in the documentation for a full list.

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 3.8, we provide one installer: 64-bit-only that works on macOS 10.9 (Mavericks) and later systems.
  • ATTENTION macOS 10.15 Catalina users! Apple has recently changed how third-party installer packages, like those provided by python.org, are notarized for verification by Gatekeeper. For the 3.8.2rc1 and 3.8.2rc2 release previews, the python.org installer pkg does not yet meet the new requirements for notarization and so may be blocked by macOS when you try to install it. You can work around this issue by either using the System Preferences > Security & Privacy window's General tab or by control-click opening the installer package in the Finder. See How to open an app that hasn’t been notarized or is from an unidentified developer for more information. This issue will be resolved in the 3.8.2 final release.
  • Please read the "Important Information" displayed during installation for information about SSL/TLS certificate validation and the running the "Install Certificates.command".

And now for something completely different

THE GREAT DEBATE NUMBER 31: TV4 OR NOT TV4?

(stern music playing)

Kennedy: Hello. Should there be another television channel, or should there not? On tonight's programme the Minister for Broadcasting, The Right Honourable Mr Ian Throat MP.
Throat: Good evening.
Kennedy: The Chairman of the Amalgamated Money 'IV, Sir Abe Sappenheim.
Sappenheim: Good evening.
Kennedy: The Shadow Spokesman for Television, Lord Kinwoodie.
Kinwoodie: Hello.
Kennedy: And a television critic, Mr Patrick Loone.
Loone: Hello.
Kennedy: Gentlemen - should there be a fourth television channel or not? Ian?
Throat: Yes.
Kennedy: Francis.
Kinwoodie: No.
Kennedy: Sir Abe?
Sappenheim: Yes.
Kennedy: Patrick.
Loone: No.
Kennedy: Well there you have it. Two say will, two say won't. We'll be back again next week, and next week's 'Great Debate' will be about Government Interference in Broadcasting and will be cancelled mysteriously.

Full Changelog

Files

Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release d6ddcc06fb9cf2c576a3d6409d65e54e 23996866 SIG
XZ compressed source tarball Source release 4ea346e0102c660492af6d037029dce7 17850992 SIG
macOS 64-bit installer Mac OS X for OS X 10.9 and later ffbb986b21d1a5f027de240aa678ce0d 29077512 SIG
Windows help file Windows 3e3548916ff556a84008a7bfac673310 8492764 SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64 09fd46d403ff6340a3d45e23243de761 8014637 SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64 808bd9c5da79155f389b11fc52fc1f30 27571560 SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64 3952faf55d4bcaeb49f68e20465f71c0 1363848 SIG
Windows x86 embeddable zip file Windows fbd4a68e5edc55da20eb04aa71fec328 7146468 SIG
Windows x86 executable installer Windows a6b681c0074a310b18410422efa57e65 26469488 SIG
Windows x86 web-based installer Windows 19580239928d26bb5d21efd0863f0890 1325888 SIG