[Matplotlib-devel] Long term release schedule

[Nathan Goldbaum]

On Mon, May 16, 2016 at 12:42 PM, Matthias Bussonnier <
bussonniermatthias at gmail.com> wrote:

> On Sun, May 15, 2016 at 1:45 PM, Fabien <fabien.maussion at gmail.com> wrote:
>
> >
> > What would be more interesting to read are arguments against this
> > initiative. But I believe that once the major projects (mpl, jupyter,
> > ipython, pandas...) have made the first step, others will undoubtedly
> > follow.
>
> Devil's advocate: You will piss of some people that will either stop
> contributing, or fork MPL, and get an indefinite
> number of bug report from people stuck on the last version supporting
> 2.7.



Another concern: if I depend on matplotlib and don't want to drop python2
support (but also don't want to drop support for newer matplotlib
versions), that means I need to simultaneously support the last py2
matplotlib through the latest and greatest matplotlib version on py3. It
would be nice if some thought could be expended for the breaking changes
you're planning on matplotlib 3.0 so that compatibility across matplotlib
versions can be attained without a huge amount of trouble.


> I suspect you will have two wave of people pissed:
> When you switch master to 3+ only, and when you **release** a 3+ only
> version.
> You'll have **some** packaging pain, as you need to publish a `tar.gz`
> and `zip` that pip should not even **try** to install on Python 2.
>
> As for undoubtedly following, I would not be so sure. I can see pandas
> and numpy be one of the last projects dropping support.
> Especially numpy which is at the base of most of the SciPy Stack.
>
> Though, having **their dependents** being python 3 only will likely
> make their decision much easier.
>
> Will mercurial ever migrate to Py3... I'm not sure, but we can argue
> it's not in the Scientific stack.
>

This is being actively worked on.

In any case, even if mercuroal doesn't move to python3, you can very easily
have a separate python2 installation. You can even do this with conda and
just symlink the hg executable into your python3 environment.


> --
> M
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