From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Hinsen <konrad.hinsen@fastmail.net>
Subject: bug#30121: python-matplotlib broken.
Date: Mon, 15 Jan 2018 17:41:55 +0100
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To: Fis Trivial <ybbs.daans@hotmail.com>, "30121@debbugs.gnu.org" <30121@debbugs.gnu.org>

Fis Trivial <ybbs.daans@hotmail.com> writes:

>> Do you have a matplotlibrc file that sets a Qt-based backend? The default backend is TkAgg, which does not require Qt. (Note that PySide is a Qt interface for Python.)
>> 
> I myself have never created such a file.
>
> I searched home with `find . -iname "*matplotlib*"`, didn't find the rc file
> you mentioned except in some virtualenvs. But that should not be related.
>
> By searching /etc as root, didn't find it either.

After some more checks, I can confirm your bug report. Matplotlib
actually does use Qt by default under Python 3. I still use Python 2
for most of my work, and under Python 2 matplotlib uses TkAgg as its
default backend.

After a quick look at the definition of python-matplotlib, I suspect
that python-pyqt should be a propagated-input, not a plain input.
I will try this out as soon as possible.

Konrad.