[vtk-developers] The numpy dataset_adaptor and Python 3

[David Gobbi]

Right now all of the tests in Common/Core pass with Python 3 except for
TestNumpyInteface:

File
"/Users/dgobbi/Work/Kitware/vtk-gitlab/Common/Core/Testing/Python/TestNumpyInterface.py",
line 69, in <module>
     assert algs.all(1 + randomVec - 1 - randomVec < 1E-4)
TypeError: unsupported operand type(s) for +: 'int' and
'VTKCompositeDataArray'

The problem lies with the VTKArray class in dataset_adapter.py.  The custom
numeric operations work differently in Python 3, my guess is that some
extra type coercion is needed.  Can someone take a look?

 - David
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