matplotlib/matplotlib — pull request #3718 by jenshnielsen (2014-10-25 20:24:05+00:00)
Title: Use is to compare with None in backend_pdf

Fixes some of the Numpy future warnings raised with numpy 1.9

The remaining ones are thrown from the Capi inside _tri.cpp and are likely related to the use of PyCXX. I don't think that there is much point in fixing them if the plan is to replace the use of PyCXX with the pure Python Capi