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Python 3.8.3rc1

Release Date: April 29, 2020

This is the release candidate of the third maintenance release of Python 3.8

Note: The release you're looking at is Python 3.8.3rc1, a bugfix release for the legacy 3.8 series. Python 3.11 is now the latest feature release series of Python 3. Get the latest release of 3.11.x here.

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.
  • 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

Graham Chapman: I think all rightthinking people in this country are sick and tired of being told that ordinary, decent people are fed up in this country with being sick and tired.
All: Yes, yes...
Graham Chapman: I'm certainly not! And I'm sick and tired of being told that I am.
Mrs. Havoc-Jones: Well, I meet a lot of people and I'm convinced that the vast majority of wrongthinking people are right.
Eric Idle: That seems like a consensus there.

Full Changelog


Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release 4388c20bb59248a52adcaec7ce4a581c 24063850 SIG
XZ compressed source tarball Source release 5997ad4840d00bd6321e5102f0bae008 17902996 SIG
macOS 64-bit installer macOS for OS X 10.9 and later fe18361ebdcf2a738679b189ac83e51d 30114709 SIG
Windows help file Windows dade3016b80bb8b5928ee227f7415fc2 8572090 SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64 17f75fd6cd5b554ff478d923b22a0f87 8176510 SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64 17069c3a06cd44663d23d95d820f65e1 27812576 SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64 168644bb1d570bda4bac81a8d0d5ea13 1364128 SIG
Windows x86 embeddable zip file Windows b86b739d84c2d4eba2ceaff57e074afd 7330372 SIG
Windows x86 executable installer Windows b674fb697db9394fcf7bd39ab17ed024 26745552 SIG
Windows x86 web-based installer Windows d4b1f174d4a769500bbd21710bba6cb0 1326272 SIG