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Bug#942106: (some kind of) transition: add python3.8 as a supported python3 version

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On 26.10.19 22:09, Rebecca N. Palmer wrote:
> What should be done with modules where Python 3.8 compatibility requires moving 
> to a new upstream release that doesn't support Python 2, but the Python 2 
> package still has dependencies (so can't be removed yet under existing rules)?
> 
> - Split them into two source packages with different upstream versions, as was 
> done for matplotlib and numpy?
> - Remove the Python 2 package anyway?
> - Let them be broken in Python 3.8 for now?
> 
> e.g. pandas dropped python2 support in 0.25.0, and gained python3.8 support in 
> 0.25.2:
> https://github.com/pandas-dev/pandas/issues/29043

yes, that will be an ongoing problem, I see the same for pillow (latest 2.7 
supporting release is 6.2.1) and numpy (1.16 not supporting 3.8, and 1.17 not 
supporting 2.7).

> Ubuntu got pandas 0.23 to build with python3.8, but only by ignoring 268 test 
> failures (I haven't yet had time to assess their severity):
> https://bugs.launchpad.net/ubuntu/+source/pandas/+bug/1849374
> https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal/focal/amd64/p/pandas/20191024_181815_7c017@/log.gz 

yes, https://bugs.launchpad.net/bugs/1849374 documents where I ignored test 
results for a first build, and numpy test results are ignored as well due to a 
packaging bug.

Ubuntu already dropped python-pandas, I wasn't involved with that. So this 
should be possible to do.  Please ask Steve Langasek for details. In the case 
for pandas it should be possible to remove it now with some work, avoiding a 
second Pandas source.

Having a first build in the archive allows you to get more packages built, and 
more people working on the stack. For example the whole astropy stack builds and 
passes tests (except astropy itself). So there is value. Lets enable to build 
stuff first for 3.8 as a supported non-default option.

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Bug#942106: (some kind of) transition: add python3.8 as a supported python3 version "Rebecca N. Palmer" <rebecca_palmer@zoho.com> - 2019-10-26 22:30 +0200
  Bug#942106: (some kind of) transition: add python3.8 as a supported python3 version Scott Kitterman <debian@kitterman.com> - 2019-10-26 23:00 +0200
  Bug#942106: (some kind of) transition: add python3.8 as a supported python3 version Matthias Klose <doko@debian.org> - 2019-10-27 00:00 +0200
    Bug#942106: (some kind of) transition: add python3.8 as a supported python3 version "Rebecca N. Palmer" <rebecca_palmer@zoho.com> - 2019-10-27 00:40 +0200
      Bug#942106: (some kind of) transition: add python3.8 as a supported python3 version "Rebecca N. Palmer" <rebecca_palmer@zoho.com> - 2019-10-27 12:30 +0100

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