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Python Release Python 3.8.0rc1 | Python.org

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Release Date: Oct. 1, 2019

Note: The release you're looking at is Python 3.8.0rc1, an outdated release. Python 3.9 is now the latest feature release series of Python 3. Get the latest release of 3.9.x here.

Please keep in mind that this is a preview release and its use is not recommended for production environments.

Some of the new major new features and changes in Python 3.8 are:

• 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
• (Hey, fellow core developer, if a feature you find important is missing from this list, let Łukasz know.)

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

• Online Documentation
• PEP 569, 3.8 Release Schedule
• Report bugs at https://bugs.python.org.
• Help fund Python and its community.

WISE MAN #1: We are three wise men.
MANDY: Well, what are you doing creeping around a cow shed at two o'clock in the morning? That doesn't sound very wise to me.
WISE MAN #3: We are astrologers.
WISE MAN #1: We have come from the East.
MANDY: Is this some kind of joke?
WISE MAN #2: We wish to praise the infant.
WISE MAN #1: We must pay homage to him.
MANDY: Homage? You're all drunk. It's disgusting. Out! The lot, out!

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