Go get it here: https://www.python.org/downloads/release/python-390a3/ 
<https://www.python.org/downloads/release/python-390a3/>
This is an early developer preview of Python 3.9

Python 3.9 is still in development. This releasee, 3.9.0a3 is the third 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 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;
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 of Python 3.9 will be 3.9.0a4, currently scheduled for 
2020-02-17.

- Ł

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