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Python 3.8.8rc1

Release Date: Feb. 16, 2021

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

Note: The release you're looking at is Python 3.8.8rc1, a bugfix release for the legacy 3.8 series. Python 3.9 is now the latest feature release series of Python 3. Get the latest release of 3.9.x here.

3.8.8rc1 introduces two security fixes:

  • bpo-42967: Fix web cache poisoning vulnerability by defaulting the query args separator to &, and allowing the user to choose a custom separator.

  • bpo-42938: Avoid static buffers when computing the repr of ctypes.c_double and ctypes.c_longdouble values.

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

Voice Over (Michael Palin): This is Ken Clean-Air Systems, the great white hope of the British boxing world. After three fights - and only two convictions - his manager believes that Ken is now ready to face the giant American, Satellite Five.
Manager (Graham Chapman): The great thing about Ken is that he's almost totally stupid.
(Cut back to Ken jogging, the early morning sun filtering through the trees.)
Voice Over: Every morning, he jogs the forty-seven miles from his two-bedroomed, eight-bathroom, six-up-two-down, three-to-go-house in Reigate, to the Government's Pesticide Research Centre at Shoreham. Nobody knows why.

Full Changelog

Files

Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release 22a1a96f3cc95d81b81bd1900ac2cd0f 24486509 SIG
XZ compressed source tarball Source release c35b0a205233cd0c2fc3b9d3e7bc3c4a 18268528 SIG
macOS 64-bit Intel installer Mac OS X for macOS 10.9 and later 04c8bea380d27cd31500d4434a287051 29832487 SIG
Windows embeddable package (32-bit) Windows 9d2a61e869cd27cfabc07d1cd50a8980 7333046 SIG
Windows embeddable package (64-bit) Windows 402c39754ed9e8d68476b61e0b31d2d7 8196462 SIG
Windows help file Windows 30e1dd96a764e25a5516f22c33ffa05e 8591914 SIG
Windows installer (32-bit) Windows 8375dd48c1cbb55f1db612433be15218 27140496 SIG
Windows installer (64-bit) Windows Recommended 06770faf2ffb5d64aec6b26d65e811ec 28222504 SIG