On behalf of the entire Python development community, and the currently serving
Python release team in particular, I’m pleased to announce the release of
Python 3.9.0a5. Get it here:
https://www.python.org/downloads/release/python-390a5/
<https://www.python.org/downloads/release/python-390a5/>
This is an early developer preview of Python 3.9
Python 3.9 is still in development. This releasee, 3.9.0a5 is the fifth of six
planned alpha releases. Alpha releases are intended to make it easier to test
the current state of new features and bug fixes and to test the release
process. During the alpha phase, features may be added up until the start of
the beta phase (2020-05-18) and, if necessary, may be modified or deleted up
until the release candidate phase (2020-08-10). Please keep in mind that this
is a preview release and its use is not recommended for production environments.
Major new features of the 3.9 series, compared to 3.8
Many new features for Python 3.9 are still being planned and written. Among the
new major new features and changes so far:
PEP 584 <https://www.python.org/dev/peps/pep-0584/>, Union Operators in dict
PEP 593 <https://www.python.org/dev/peps/pep-0593/>, Flexible function and
variable annotations
PEP 602 <https://www.python.org/dev/peps/pep-0602/>, Python adopts a stable
annual release cadence
BPO 38379 <https://bugs.python.org/issue38379>, garbage collection does not
block on resurrected objects;
BPO 38692 <https://bugs.python.org/issue38692>, os.pidfd_open added that allows
process management without races and signals;
BPO 39926 <https://bugs.python.org/issue39926>, Unicode support updated to
version 13.0.0
BPO 1635741 <https://bugs.python.org/issue1635741>, when Python is initialized
multiple times in the same process, it does not leak memory anymore
A number of Python builtins (range, tuple, set, frozenset, list) are now sped
up using PEP 570 <https://www.python.org/dev/peps/pep-0570> vectorcall
A number of standard library modules (audioop, ast, grp, _hashlib, pwd,
_posixsubprocess, random, select, struct, termios, zlib) are now using the
stable ABI defined by PEP 384 <https://www.python.org/dev/peps/pep-0384/>.
(Hey, fellow core developer, if a feature you find important is missing from
this list, let Łukasz know <mailto:luk...@python.org>.)
The next pre-release, the last alpha release of Python 3.9, will be 3.9.0a6. It
is currently scheduled for 2020-04-22. Until then, stay safe!
Your friendly release team,
Ned Deily @nad <https://discuss.python.org/u/nad>
Steve Dower @steve.dower <https://discuss.python.org/u/steve.dower>
Łukasz Langa @ambv <https://discuss.python.org/u/ambv>
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