Bug#938494: skimage (build-)depends on python-cloudpickle which has already been dropped

[Drew Parsons]

On 2019-09-13 15:42, Andreas Tille wrote:
> Hi,
> 
> as Peter Green found out the cloudpickle source package droped Python2
> support which makes bug #938494 serious.  I guess it would be even
> harder to drop python-skimage right now since this would affect
> python-numpy and according to
> 
>    $ apt-cache rdepends python-numpy | sort | uniq | wc -l
> 
> 339 reverse dependencies.  I have no better solution than just pinging
> bug #938494 from time to time - and to ping this list to work harder on
> Python3 migration.


It is something of a problem, so I'm cc:ing debian-python.

There have been a number of packages dropping python2 support 
out-of-sequence, causing this problem.  Not just cloudpickle, also 
pyqtgraph, which still had pymca as a dependent.  Fortunately pymca was 
already ready to drop the dependency, but still, how many other examples 
are there?

Python maintainers, remember, check your reverse dependencies before 
dropping your python2 packages.
Check each of

   build-rdeps python-yourmodule
   apt-rdepends -r python-yourmodule

and confirm the package has rdeps=0 on Sandro's list at 
http://sandrotosi.me/debian/py2removal/index.html

Drew