Cannot make plot_directive to work on Python-3

[ankostis]

I'm trying to embed autogenerated matplotlib diagrams into the docs with the Sphinx's plot_directive but i have multiple issues with the current state of things in python-3.
I have read the relevant issues explaining how to use the global system's packages (#217, #218 & #272, #334), yet i cannot figure out the following:

1. The "virtualenv + --system-site-packages" does not work, and when RTD prepares the build, it still tries to download and install a new matplotlib version, and ofcourse it fails due to freetype:

   ...
   Extension error:
   Could not import extension matplotlib.sphinxext.plot_directive (exception: No module named 'matplotlib')

2. I cannot find somewhere a list with the available global-site packages in each environment. In my case I need real (not mocked-out) pandas, numpy, scipy & matplotlib for the pyplot-diagrams to work. Are these available as site-packages? (assuming that i manage to see them)

[cdeil]

I have a plot that needs scipy 0.14, but readthedocs has scipy 0.13 and pip install fails for scipy 0.14 because the BLAS libraries are missing:
https://readthedocs.org/builds/gammapy/1618791/

Would it be possible to update to scipy 0.14?

And could you please update the list of pre-installed package and add the version numbers here?
https://docs.readthedocs.org/en/latest/builds.html#packages-installed-in-the-build-environment

Thanks!

[ankostis]

Please, is it possible that RTD-builders have system-provided packages for matplotlib, numpy, scipy and pandas for python-3 installed?
(python-2 seems to already provide these packages, so it is kind of "discrimination" for python-3 projects :-)

[ankostis]

Please, any feedback on this?

[cdeil]

Something changed on readthedocs.
For me pip install scipy now works:
https://readthedocs.org/projects/gammapy/builds/3287203/
Thanks!

[agjohnson]

I believe py3 is still affected here. I'll open a ticket to get some of the missing py3 dependencies into our builders

[gregmuellegger]

@ankostis We now have python3 packages for matplotlib, scipy and numpy on the servers. I assume that the plot_directive will now work for Python3 builds. Sorry for the real long wait. Finally we are there :)

[cdeil]

🎉 😄 🎉
Thank you!