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[RELEASE] Python 3.8.0rc1 is now available


Python 3.8.0 is almost ready. After a rather tumultuous few days, we are very happy to announce the availability of the release candidate:

https://www.python.org/downloads/release/python-380rc1/ <https://www.python.org/downloads/release/python-380rc1/>

This release, 3.8.0rc1, is the final planned release preview. Assuming no critical problems are found prior to 2019-10-14, the scheduled release date for 3.8.0, no code changes are planned between this release candidate and the final release.
Please keep in mind that this is not the gold release yet and as such its use is not recommended for production environments.

Major new features of the 3.8 series, compared to 3.7

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

PEP 572 <https://www.python.org/dev/peps/pep-0572/>, Assignment expressions
PEP 570 <https://www.python.org/dev/peps/pep-0570/>, Positional-only arguments
PEP 587 <https://www.python.org/dev/peps/pep-0587/>, Python Initialization Configuration (improved embedding)
PEP 590 <https://www.python.org/dev/peps/pep-0590/>, Vectorcall: a fast calling protocol for CPython
PEP 578 <https://www.python.org/dev/peps/pep-0578>, Runtime audit hooks
PEP 574 <https://www.python.org/dev/peps/pep-0574>, Pickle protocol 5 with out-of-band data
Typing-related: PEP 591 <https://www.python.org/dev/peps/pep-0591> (Final qualifier), PEP 586 <https://www.python.org/dev/peps/pep-0586> (Literal types), and PEP 589 <https://www.python.org/dev/peps/pep-0589> (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 ?ukasz know <mailto:lukasz at python.org>.)
Call to action: focus on the docs now

Are all your changes properly documented?
Did you notice other changes you know of to have insufficient documentation?
Can you help with the ?What?s New <https://docs.python.org/3.8/whatsnew/3.8.html>? document?

- ?

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