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

[Christian Heimes]

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