Python 3.4 tkagg backend error while importing pyplot

[tobias47n9e]

Python 3.4.0 currently gives me the following error when importing pyplot (I am using the Ubuntu daily build of matplotlib: https://launchpad.net/~takluyver/+archive/matplotlib-daily). I couldn't fix it using pip3 (http://stackoverflow.com/questions/13110403/matplotlib-backend-missing-modules-with-underscore). There is also this: pism/regional-tools#3

>>> from matplotlib.pyplot import *
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/matplotlib/pyplot.py", line 103, in <module>
    _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
  File "/usr/lib/python3/dist-packages/matplotlib/backends/__init__.py", line 32, in pylab_setup
    globals(),locals(),[backend_name],0)
  File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_tkagg.py", line 13, in <module>
    import matplotlib.backends.tkagg as tkagg
  File "/usr/lib/python3/dist-packages/matplotlib/backends/tkagg.py", line 7, in <module>
    from matplotlib.backends import _tkagg
ImportError: cannot import name '_tkagg'

[tacaswell]

@takluyver Can you take a look at this? My interpretation of that error is that the installation/build is borked as there is a missing c-extension.

[takluyver]

I've copied a couple of Tk-related changes across from Ubuntu's packaging; hopefully it will be fixed when it next builds.

[tobias47n9e]

The build python3-matplotlib 1.4.0~1+7018+28~ubuntu14.04.1 still gives the same error. I will check again tomorrow.

[takluyver]

That was the build before I changed anything. I made a silly mistake and it failed to build - I've kicked off a new build, so fingers crossed it will work this time.

[takluyver]

OK, the build has succeeded now, and I see _tkagg.so in the build log - can you give it a try?

[tobias47n9e]

Everything works again. Perfect. Thank you!

[tacaswell]

Great! Closing.