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 3.9.0b4. Get it here:
https://www.python.org/downloads/release/python-390b4/
<https://www.python.org/downloads/release/python-390b4/>
This is a beta preview of Python 3.9
Python 3.9 is still in development. This release, 3.9.0b4, is the fourth of
five planned beta release previews.
Beta release previews are intended to give the wider community the opportunity
to test new features and bug fixes and to prepare their projects to support the
new feature release.
Call to action
We strongly encourage maintainers of third-party Python projects to test with
3.9 during the beta phase and report issues found to the Python bug tracker
<https://bugs.python.org/> as soon as possible. While the release is planned to
be feature complete entering the beta phase, it is possible that features may
be modified or, in rare cases, deleted up until the start of the release
candidate phase (2020-08-10). Our goal is have no ABI changes after beta 5 and
as few code changes as possible after 3.9.0rc1, the first release candidate. To
achieve that, it will be extremely important to get as much exposure for 3.9 as
possible during the beta phase.
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
Some of the new major new features and changes in Python 3.9 are:
PEP 584 <https://www.python.org/dev/peps/pep-0584/>, Union Operators in dict
PEP 585 <https://www.python.org/dev/peps/pep-0585/>, Type Hinting Generics In
Standard Collections
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
PEP 615 <https://www.python.org/dev/peps/pep-0615/>, Support for the IANA Time
Zone Database in the Standard Library
PEP 616 <https://www.python.org/dev/peps/pep-0616/>, String methods to remove
prefixes and suffixes
PEP 617 <https://www.python.org/dev/peps/pep-0617/>, New PEG parser for CPython
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, dict) are now
sped up using PEP 590 <https://www.python.org/dev/peps/pep-0590> vectorcall;
A number of Python modules (_abc, audioop, _bz2, _codecs, _contextvars, _crypt,
_functools, _json, _locale, operator, resource, time, _weakref) now use
multiphase initialization as defined by PEP 489
<https://www.python.org/dev/peps/pep-0489/>;
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 fifth beta release of Python 3.9, will be 3.9.0b5. It
is currently scheduled for 2020-07-20.
More resources
Online Documentation <https://docs.python.org/3.9/>
PEP 596 <https://www.python.org/dev/peps/pep-0596/>, 3.9 Release Schedule
Report bugs at https://bugs.python.org <https://bugs.python.org/>.
Help fund Python and its community <https://discuss.python.org/psf/donations/>.
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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