Dropping Python 2.7 support

[wesm]

There were a few comments about this in the initial pull requests.

Some of my arguments for dropping Python 2.7 support

• Probably first production-ready release of pandas 2.x will realistically be late 2017 / early 2018 (beta / testing releases available before then). This means < 3 years until Python 2 end-of-life (https://pythonclock.org/)
• C++11 is not well supported in Windows builds of Python 2.7 due to a dependence on an older MSVC runtime. I feel pretty strongly that judicious use of modern C++ (aka C++11/14) will yield better developer productivity (auto, anyone?) and higher quality software in the libpandas internals
• Can start thinking about / making use of Python 3.x only features, like asyncio

It would be great for us to reach some decision about this and also join the Python 3 statement: https://python3statement.github.io/ (per @takluyver suggestion)

[shoyer]

I'm totally on board with this for pandas 2.0.

[jorisvandenbossche]

Me as well, +1

[sinhrks]

+1

[wesm]

Anyone opposed to joining the Python 3 statement website? I'll leave the question open for a few days before we decide one way or another

[jorisvandenbossche]

With the thumbs up I mean that I am not opposed :)

[TomAugspurger]

👍 Like IPython's timeline that's split between IPython 5.x LTS and other, we should note that pandas 1.x will support 2.7 until sometime (2020?), and 2.x is py3 only.

[FrancescAlted]

+1 for dropping support for Python 3 on pandas 2.0

[jtratner]

Sounds like the right choice to go python 3 only for 2.X
On Thu, Sep 1, 2016 at 6:53 AM Tom Augspurger notifications@github.com
wrote:

👍 Like IPython's timeline that's split between IPython 5.x LTS and
other, we should note that pandas 1.x will support 2.7 until sometime
(2020?), and 2.x is py3 only.

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[takluyver]

There seems to be pretty enthusiastic support for the general idea. Would you like me to add pandas to the Python 3 statement website?

Also, is there a square-ish version of the pandas logo somewhere? Or is it OK if I cut out just the three plots on the right and put them above the word pandas?

[TomAugspurger]

+1 to joining the Python 3 statement, but do we have a rough date for when pandas 1.X support would end? Not that this is binding...

[wesm]

@takluyver that is fine by me if there are no objections from others.

If/when pandas 2.0 goes to production, we'll have to decide how much longer to continue maintaining 1.x (e.g. what severity of bug fix will merit backporting / bugfix release). Hard to predict until we get there

[takluyver]

Have a look at python3statement/python3statement.github.io#49, which adds it using the right-hand part of the logo.

The statement is roughly saying that our projects won't make any more Python 2 compatible releases beyond 2020. We won't enforce that, of course, but I think dropping support in four years time should be reasonable.