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Python 3.8.3

Release Date: May 13, 2020

This is the third 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.
  • 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

Mr Anemone (Graham Chapman): Mr Chigger. So, you want to learn to fly?
Mr Chigger (Terry Jones): Yes.
Mr Anemone: Right, well, up on the table, arms out, fingers together, knees bent...
Mr Chigger: No, no, no.
Mr Anemone: (very loudly) UP ON THE TABLE! (Mr Chigger gets on the table) Arms out, fingers together, knees bent, now, head well forward. Now, flap your arms. Go on, flap, faster... faster... faster... faster, faster, faster, faster - now JUMP! (Mr Chigger jumps and lands on the floor) Rotten. You're no bloody use at all. You're an utter bloody wash-out. You make me sick, you weed!
Mr Chigger: Now look here...
Mr Anemone: All right, all right. I'll give you one more chance, get on the table...
Mr Chigger: Look, I came here to learn how to fly an aeroplane.
Mr Anemone: A what?
Mr Chigger: I came here to learn how to fly an aeroplane.
Mr Anemone: (sarcastically) Oh, 'an aeroplane'. Oh, I say, we are grand, aren't we? (imitation posh accent) 'Oh, oh, no more buttered scones for me, mater. I'm off to play the grand piano'. 'Pardon me while I fly my aeroplane.' NOW GET ON THE TABLE!

Full Changelog

Files

Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release a7c10a2ac9d62de75a0ca5204e2e7d07 24067487 SIG
XZ compressed source tarball Source release 3000cf50aaa413052aef82fd2122ca78 17912964 SIG
macOS 64-bit installer Mac OS X for OS X 10.9 and later dd5e7f64e255d21f8d407f39a7a41ba9 30119781 SIG
Windows help file Windows 4aeeebd7cc8dd90d61e7cfdda9cb9422 8568303 SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64 c12ffe7f4c1b447241d5d2aedc9b5d01 8175801 SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64 fd2458fa0e9ead1dd9fbc2370a42853b 27805800 SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64 17e989d2fecf7f9f13cf987825b695c4 1364136 SIG
Windows x86 embeddable zip file Windows 8ee09403ec0cc2e89d43b4a4f6d1521e 7330315 SIG
Windows x86 executable installer Windows 452373e2c467c14220efeb10f40c231f 26744744 SIG
Windows x86 web-based installer Windows fe72582bbca3dbe07451fd05ece1d752 1325800 SIG