[Python-Dev] PEP 594: Removing dead batteries from the standard library

[Guido van Rossum]

+1. Let's keep colorsys then.

On Tue, May 21, 2019 at 7:41 AM Petr Viktorin <encukou at gmail.com> wrote:

> On 5/21/19 12:06 PM, Christian Heimes wrote:
> > On 21/05/2019 11.49, Nathaniel Smith wrote:
> >> On Tue, May 21, 2019 at 2:40 AM Walter Dörwald <walter at livinglogic.de>
> wrote:
> >>>
> >>> On 20 May 2019, at 22:15, Christian Heimes wrote:
> >>>
> >>>> Hi,
> >>>>
> >>>> here is the first version of my PEP 594 to deprecate and eventually
> >>>> remove modules from the standard library. The PEP started last year
> >>>> with talk during the Python Language Summit 2018,
> >>>> https://lwn.net/Articles/755229/.
> >>>>
> >>>> [...]
> >>>>
> >>>> colorsys
> >>>> ~~~~~~~~
> >>>>
> >>>> The `colorsys <https://docs.python.org/3/library/colorsys.html>`_
> >>>> module
> >>>> defines color conversion functions between RGB, YIQ, HSL, and HSV
> >>>> coordinate
> >>>> systems. The Pillow library provides much faster conversation between
> >>>> color systems.
> >>>>
> >>>> Module type
> >>>>    pure Python
> >>>> Deprecated in
> >>>>    3.8
> >>>> To be removed in
> >>>>    3.10
> >>>> Substitute
> >>>>    `Pillow <https://pypi.org/project/Pillow/>`_,
> >>>>    `colorspacious <https://pypi.org/project/colorspacious/>`_
> >>>
> >>> I'm using colorsys constantly as the basis for a tool that converts CSS
> >>> colors between different coordinate systems. I don't see how that could
> >>> be done via Pillow (which AFAICT only converts complete images).
> >>> RGB<->HSV<->HLS conversion seems to be not available (or not obvious)
> in
> >>> colorspacious.
> >>
> >> Correct, colorspacious doesn't support HSV or HLS. I suppose it would
> >> be trivial enough to add...
> >>
> >> The 'colour' package has them (along with everything else you can
> >> dream of): https://colour.readthedocs.io/en/latest/colour.models.html
> >
> > Nice catch, I just added
> https://python-colormath.readthedocs.io/en/latest/ to my update PR. I'll
> add colour to the list, too.
> >
> > (It didn't pop up on my radar because I wasn't checking for British
> spelling)
> >
> > Christian
>
>
> Please, don't remove colorsys. HSL and HSV aren't outdated, and AFAIK,
> the module is not a maintenance burden.
>
> The packages on PyPI offer more advanced models. Perhaps they could be
> linked in the documentation, if we want to endorse them. But just as
> we're not removing `array` in favor of `numpy`, we shouldn't remove
> colorsys either. Colorsys is not dead, it's just small.
>
> I assume one of the reasons colorspacious doesn't support HSV or HLS is
> that HSV/HLS tends to be used for quite different purposes than the more
> fancy color spaces. You'd use HSL/HSV for a simple color picker or a
> saturation shift on a web page, GUI or game (where you don't have
> *exact* colors anyway); things like sRGB or CIELab are for color
> management, photos, printing, etc.
>
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-- 
--Guido van Rossum (python.org/~guido)
*Pronouns: he/him/his **(why is my pronoun here?)*
<http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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