[Matplotlib-devel] supported python versions

OceanWolf juichenieder-nabb at yahoo.co.uk
Tue Sep 15 12:28:35 CEST 2015

I don't think it does undermine 2.0's philosophy of "style changes only" 
as this doesn't affect the code in anyway as we don't add in any new 
features in 2.0, therefore MPL-2.0 will still work fine with python-2.6, 
we just won't officially support python-2.6 with version 2.0, and should 
we have minor releases (2.0.1) then we don't have to worry about 
py-2.6.  2.0 feels like a more appropriate place to drop it.


On 14/09/15 22:17, Nathaniel Smith wrote:
> It seems like a good idea in general to me, but doesn't it kinda 
> undermine the "2.0 is style changes only" idea/messaging? I assume the 
> maintenance burden of supporting the old versions in 2.0 won't be 
> large compared to 1.5 given this... Maybe 2.1 (or 1.5!) would be a 
> better place to draw the line?
> On Sep 14, 2015 12:49 PM, "Thomas Caswell" <tcaswell at gmail.com 
> <mailto:tcaswell at gmail.com>> wrote:
>     Hey all,
>     I would like to propose the following for which version of python
>     mpl officially supports:
>      - for v1.5 we continue to support 2.6, 2.7, 3.3-3.5
>      - for v2.0 forward we support (2.7, 3.4, 3.5)
>     and allow for new, python3 only, features to be developed for
>     mpl2.1 onward, so long as they do not break any existing
>     functionality in py2.7.
>     We already support all of those versions on master, there is no
>     good reason to drop 2.6 support right before the RC.  For 2.0 we
>     should drop 2.6 so that we do not have to maintain a mpl2.0.x
>     py2.6 compatible bug-fix branch.
>     Regarding dropping 2.6 as a supported version I suggest you
>     read/watch the following from Nick Coghlan:
>     http://www.curiousefficiency.org/posts/2015/04/stop-supporting-python26.html
>     http://www.pyvideo.org/video/3764/contributors-colleagues-clients-customers-su
>     We are resource limited and those resources would be better spent
>     improving the library and supporting modern version of python.  At
>     some point it is unreasonable for people running very old
>     installations of python to expect the the newest versions of
>     down-stream tools to work.  If this is important to someone,
>     please step up to mange maintaining a 1.5.x bug-fix branch which
>     will maintain 2.6 compatibility.
>     Dropping 2.6 will also free us to being using OrderedDict and
>     several other language features added in 2.7.
>     Regarding dropping 3.3, every survey has shown that among the
>     users who have adopted py3, a vast majority are using the newest
>     version so supporting and testing against the older versions of 3
>     is not worth the effort.
>     In all cases, versions of mpl that currently work on legacy
>     versions of python will continue to work.
>     Thanks to Eric, Mike, and Phil who have this a read over.
>     Tom
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