Does the gtk3agg backend work on python3?

[mdboom]

Whatsnew indicates that the gtk3agg backend works on python3. However
backend_gtk3agg.py still contains a warning about in not working:

warnings.warn("The Gtk3Agg backend is not known to work on Python 3.x.")

and I'm still seeing the error given in the original pull request (#590) when using this backend on python3
on ubuntu 12.04.

NotImplementedError: Surface.create_for_data: Not Implemented yet.

Does it work with more resent versions of the gtk3 bindings for python3?

Edit: Ubuntu 12.04 ships with python3-gi 3.2.2

[mdboom]

Sorry -- this is an error on my part in the release notes. I'll fix that.

It doesn't work yet, given the lack of "Surface.create_for_data" in pycairo. It's not clear to me when that will be implemented in a released version and why it hasn't been. See my e-mail question here:

http://lists.cairographics.org/archives/cairo/2011-November/022519.html

[mdboom]

I have updated the docs, but I am leaving this open with "upstream fix required" so we can track the progress of Cairo.

[spinnau]

@mdboom A new implementation of the ImageSurface.create_for_data() method was committed in the pycairo git repo a few month ago (after your test of the git version as described in the mailing list). But until now there is now new release available...

[mdboom]

Yes, I believe for the time being you need to build pycairo from the git repository from source.

[eduardohenriquearnold]

Unfortunately they didn't build another version and don't seem worried about this either. Isn't there another option besides pycairo to make matplotlib available in GTK3 with Python3?

It's disappointing to have matplotlib, numpy and pygobject working with Python3 but not being able to integrate all this amazing tools.

[mdboom]

Yes -- it is annoying. Unfortunately, I don't think there's a technical workaround from our end -- all we can do it put more pressure on the pycairo folks to make a new release.

[mattip]

What would be the easiest way to see if cairocffi (which seems to have ImageSurface.create_for_data() ) could work with matplotlib?

[tacaswell]

@fariza Do you know if gtk + py3k works now?

[fariza]

@tacaswell I don't know

[mdboom]

pycairo still hasn't had a release since 2011.

However, as @mattip suggested (8 months ago, now, sorry), cairocffi does appear to work, with some minor tweaks. Attached is code to support cairocffi, if installed, which also provides away for Gtk3Agg to work on Python 3.

[tacaswell]

failures are more smoketest time outs.

[SchrodengerY]

I also meet this problem.
And I solve it by using
import matplotlib matplotlib.use('Qt5Agg')
But I don't know why.

[tacaswell]

@SchrodengerY If you use use("Qt5Agg") than you are using the Qt5 gui toolkit, not the gtk3 gui toolkit.