Thank you for looking into this!

Another benefit alongside ease of install and discoverability, is that it 
makes the requirements files of projects using Django more self-documenting 
(in that it avoids stray dependency entries that appear to be unused, but 
actually aren't - and so need a comment to explain what uses them). See 
also the related open ticket https://code.djangoproject.com/ticket/27682.

Re the single package entries, I think there is still value in having them, 
so long as they are named by feature rather than by package name. eg 
`Django[crypto]` vs `Django[bcrypt]`. This allows the particular choice of 
library to be a Django implementation detail that can be adjusted without 
needing requirements file changes.

Ed

On Monday, 11 December 2017 10:26:11 UTC, jr...@leukeleu.nl wrote:
>
> Django has a number of optional features that require the installation of 
> additional Python packages.
>
>
> Right now it's possible to $ pip install Django[bcrypt,argon2] to install 
> Django and the optional packages (at the correct minimum version) required 
> for bcrypt/argon2 support.
>
>
> However this is not possible for other optional features, like 
> database/cache backend, gis, certain image related features etc.
>
> I've created a pull request adding the optional dependencies found in the 
> test requirements: https://github.com/django/django/pull/9440 / 
> https://code.djangoproject.com/ticket/28905
>
> So end users can do things like:
>
>
> $ pip install Django[mysql,sqlparse,images,memcached]
> $ pip install Django[postgresql,gis]
> $ pip install Django[selenium,test-parallel]
>  
>
> Not only would this make it much easier to install a particular 
> combination of Django and optional dependencies correctly, it also makes 
> some of the optional features/dependencies a little bit more discoverable.
> This might not the full set of optional dependencies, or the right 
> grouping/naming, so a review is more than welcome (i.e. should sqlparse 
> be added to the mysql/oracle extra requirements? Should a sqlite extra be 
> added that only includes sqlparse?).
>  
> Besides adding this to setup.py, additional changes to the documentation, 
> test instructions and scripts, code warnings etc. will probably be 
> necessary.
>
> If anyone objects to adding these extra requirements I'd also like to hear 
> about it.
>

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