[Paraview] vtkDataSetReader missing?

[Chris Cameron]

Hello,

I was given a code example that makes use of vtkDataSetReader to open and
read a .vtk file.
When I try to run the code example it errors out saying that the vtk module
does not include a vtkDataSetReader.
The import at the beginning of the python is:

    from paraview import vtk

and the reader is referenced as:

    reader = vtk.vtkDataSetReader()

It has been suggested that I may have to replace use of vtkDataSetReader
with paraview.sources.LegacyVTKFileReader.

Question:
Should I make this replacement or is vtkDataSetReader missing from
paraview.vtk?

We are using the latest developent HEAD of paraview as downloaded approx.
two days ago.

Thank You,

Chris Cameron
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