[vtkusers] passing vtkDataArray to python/Numeric arrays

[Bryan Cole]

Is there an efficient way to pass the data from a vtkDataArray object to
a python Numeric array (for easier manipulation)?

I can do the reverse using vtkDataArray::SetVoidArray, but
vtkDataArray::GetVoidArray doesn't return anything useful to python.

Note. I need to do this for general vtkDataArrays, so the
vtkImageExportToArray python class doesn help (as it only handles
vtkImageData).

Bryan