PyVTK provides the following tools for manipulating Visualization
Toolkit (VTK) files in Python:

 * ascii and binary output, ascii input from VTK file
 * DataSet formats: StructuredPoints, StructuredGrid, RectilinearGrid, PolyData,
   UnstructuredGrid
 * Data formats: PointData, CellData
 * DataSetAttr formats: Scalars, ColorScalars, LookupTable, Vectors, Normals,
   TextureCoordinates, Tensors, Field

WWW: https://github.com/pearu/pyvtk