Yeah, we will probably drop Python 2 entirely after 3.0.0. Python 2 is already deprecated.
On Thu, 15 Aug 2019, 18:25 Driesprong, Fokko, <fo...@driesprong.frl> wrote: > Sorry for the late reply, was a bit busy lately, but I still would like to > share my thoughts on this. > > For Apache Airflow we're dropping support for Python 2 in the next major > release. We're now supporting Python 3.5+. Mostly because: > > - Easier to maintain and test, and less if/else constructions for the > different Python versions. Also, not having to test against Python 2.x > reduces the build matrix. > - Python 3 has support for typing. From Python 3.5 you can include > provisional type hints. An excellent presentation by Guido himself: > https://www.youtube.com/watch?v=2wDvzy6Hgxg. From Python 3.5 it is > still provisional, but it is a really good idea. From Airflow we've noticed > that using mypy is catching bugs early: > - This will put less stress on the (boring part of the) reviewing > process since a lot of this stuff is checked automatically. > - For new developers, it is easier to read the code because of the > annotations. > - Can be used as an input for generated documentation (or check if > it still in sync with the docstrings) > - Easier to extend the code since you know what kind of types you > can expect, and your IDE will also pick up the hinting. > - Python 2.x will be EOL end this year > > I have a strong preference to migrate everything to Python 3. > > Cheers, Fokko > > > Op wo 7 aug. 2019 om 12:14 schreef Weichen Xu <weichen...@databricks.com>: > >> All right we could support both Python 2 and Python 3 for spark 3.0. >> >> On Wed, Aug 7, 2019 at 6:10 PM Hyukjin Kwon <gurwls...@gmail.com> wrote: >> >>> We didn't drop Python 2 yet although it's deprecated. So I think It >>> should support both Python 2 and Python 3 at the current status. >>> >>> 2019년 8월 7일 (수) 오후 6:54, Weichen Xu <weichen...@databricks.com>님이 작성: >>> >>>> Hi all, >>>> >>>> I would like to discuss the compatibility for dev scripts. Because we >>>> already decided to deprecate python2 in spark 3.0, for development scripts >>>> under dev/ , we have two choice: >>>> 1) Migration from Python 2 to Python 3 >>>> 2) Support both Python 2 and Python 3 >>>> >>>> I tend to option (2) which is more friendly to maintenance. >>>> >>>> Regards, >>>> Weichen >>>> >>>
