[scikit-image] Minimum Python version?

[Thomas Caswell]

For Matplotlib we are going with 3 years worth of python versions (
https://matplotlib.org/devdocs/devel/min_dep_policy.html ) which seems like
a reasonable compromise between keeping the library up-to-date and keep
users stuck on old(er) versions of python able to access master.  We also
thought about "last 2 versions of python" but if you plan to release near a
python release date things get a bit dicey planning wise.

Tom

On Tue, Jun 26, 2018 at 9:18 PM Juan Nunez-Iglesias <jni at fastmail.com>
wrote:

>
> On Wed, Jun 27, 2018, at 9:03 AM, Stefan van der Walt wrote:
> > $ pypinfo skimage pyversion
>
> pypinfo! Awesome!
>
> > | python_version | download_count |
> > | -------------- | -------------- |
> > | 3.6            |          3,172 |
> > | 2.7            |          1,995 |
> > | 3.5            |          1,866 |
> > | 3.4            |            118 |
> > | None           |             85 |
> > | 3.7            |             18 |
> >
> > It looks like 3.5 currently makes up about 37% of Python 3 installs.
> > This number should come down over the next few months, but I suggest we
> > keep supporting 3.5 for at least one more release.
>
> Another way of looking at these numbers is that 3.5 makes up a smaller
> proportion than 2.7, which we are now supporting only via the LTS. ;) But I
> am being facetious. The sum of 2.7 and 3.5 is more than 3.6. It would be
> bad to only support a minority of our users in master.
>
> Thanks for the info! I agree, let's wait until one month after 0.15 and
> check the stats again at that point.
>
> Juan.
>
> ...
>
> Ok so I looked at the command and thought, hmm, should that be
> scikit-image? After 30 painful minutes of setting up my own bigquery
> credentials:
>
> pypinfo scikit-image pyversion
>
> | python_version | download_count |
> | -------------- | -------------- |
> | 2.7            |         61,274 |
> | 3.6            |         23,767 |
> | 3.5            |         20,466 |
> | None           |          3,693 |
> | 3.4            |          1,048 |
> | 3.7            |             81 |
> | 3.3            |              3 |
> | 2.6            |              2 |
> | 3.2            |              1 |
>
> This comes with all the caveats of tracking PyPI downloads (most are from
> CI etc), but nevertheless: yes, let's keep 3.5 around. And let's make good
> on our LTS promise. =)
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