interactive mode not working with backends gtk3agg, gtk3cairo

[thraen]

import matplotlib
matplotlib.use('GTK3Cairo') 
from pylab import *
ion()
plot([1,2,3])
xlabel('hi mom')
show()

doesn't show anything, no error no plot. same for backends gtk3agg.
Only when I close the python shell I get an error:

Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/matplotlib/_pylab_helpers.py", line 86, in destroy_all
    manager.destroy()
  File "/usr/lib64/python3.3/site-packages/matplotlib/backends/backend_gtk3.py", line 427, in destroy
    self.canvas.destroy()
AttributeError: 'FigureManagerGTK3Agg' object has no attribute 'canvas'

[tacaswell]

What system, which version of mpl, and how did you install it?

[thraen]

Sorry, this happens on gentoo, python3.3 and 2.7, matplotlib-1.3.0, both installed via gentoo package manager.

[thraen]

Somebody has the same problem in ubuntu https://bugs.launchpad.net/ubuntu/+source/matplotlib/+bug/1398987

[jenshnielsen]

I don't think that the GTK3Agg backend works with Python3 in 1.3.x
The GTK3Cairo backend should work thou.

This is due to features not implemented in PyCairo which does not seem to get regular releases anymore. From 1.4 onwards Matplotlib can use CairoCFFI as an alternative to PyCairo and that should work.

[WeatherGod]

The bug in Ubuntu is for GTK3Cairo. The bug here is for GTK3Agg. Both are
for py3k, though. I suspect something is not py3k compliant in the
backend_gtk3.py, an exception is being thrown, killing the program. Then,
while in the process of destroying everything, a new exception forms
because our cleanup code is not being careful enough.

Does everything work fine without the ion() call?

On Thu, Dec 4, 2014 at 9:51 AM, Jens Hedegaard Nielsen <
notifications@github.com> wrote:

I don't think that the GTK3Agg backend works with Python3 in 1.3.x
The GTK3Cairo backend should work thou.

This is due to features not implemented in PyCairo which does not seem to
get regular releases anymore. From 1.4 onwards Matplotlib can use CairoCFFI
as an alternative to PyCairo and that should work.

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#3881 (comment)
.

[jenshnielsen]

This is the Cairo issue mentioned above #1227

[jenshnielsen]

That being said I can't make interactive work with gtk3Agg using the current master of mpl and CairoCFFI in neither python2 nor 3

[WeatherGod]

So, it is some sort of interaction between gtk3 backend and ion()?

On Thu, Dec 4, 2014 at 10:05 AM, Jens Hedegaard Nielsen <
notifications@github.com> wrote:

That being said I can't make interactive work with gtk3Agg using the
current master of mpl and CairoCFFI in neither python2 nor 3

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#3881 (comment)
.

[thraen]

some more info:

python2.7 + gtk3Cairo + ioff(): works
python2.7 + gtk3Agg + ioff(): works
python2.7 + gtk3Cairo + ion(): no window visible, on cleanup above complaint about missing canvas
python2.7 + gtk3Agg + ion(): no window visible, on cleanup above complaint about missing canvas

python3 + gtk3Cairo + ioff(): works
python3 + gtk3Agg + ioff(): Warning gtk3agg doesn't work with python3, shows empty window
python3 + gtk3Cairo + ion(): no window visible, on cleanup above complaint about missing canvas
python3 + gtk3Agg + ion(): Warning gtk3agg doesn't work with python3, no window showing up

on my machine that is

[thraen]

I'm not sure if this is related or another problem:
My wx and wxagg backends also don't work in interactive mode, while they work noninteractively. But with those, there's no error message when I close python. Instead I see the plot window flicker up for a few milliseconds.
But this could very well be something completely different. Should I open another issue for that?