[Python-modules-team] Bug#805435: libapache2-mod-wsgi-py3, broken depends when rebuilt.

[peter green]

Package: libapache2-mod-wsgi-py3
Version: 4.3.0-1
Severity: serious
Tags: stretch sid
x-debbugs-cc: debian-python at lists.debian.org

I run a derivative called raspbian and I noticed our auto-binnmuer was 
repeatedly binnmuing mod-wsgi. Further investigation reveealed that 
every time it was rebuilt it was getting dependencies like.

python3 (>= 3.5), python3 (<<  3.5)


Which is obviously unsatisfiable.

I was able to reproduce this with a manual test build in a Debian sid 
environment.

Further investigation showed that the code in debian/rules assumed that 
supported python3 versions would be listed from lowest to highest but 
the current version of py3versions -vs always lists the default version 
last. My memory tells me this was a recent behaviour change and that 
would seem to fit with the fact that in Debian this package was 
successfully binnmu'd to add python 3.5 support.

As a quick fix I added some commands to debian/rules to sort the list 
before extracting the first and last entries and uploaded to Raspbian. A 
debdiff is attached, no intent to NMU in Debian.

  ccing debian-python for their opinion on

1: whether they were aware that this behaviour change could break packages
2: whether there is a better way to get the highest and lowest currently 
supported python3 version.

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