VTK fetching PointData from unstructured grid in python

Hi, I’m currently tasked with creating an im- and export routine using pure VTK with python3, in which the contents of a vtk/vtu mesh file (XML Unstructured Grid in our case) are to be extracted to a string / array based format for database storage.
(Currently using vtk.vtkStructuredPointsReader() to get the mesh and then going via GetOutput() )
I am able to get point coordinates and cells from the mesh file, however I’m unable to get the point data and cell data from the meshes.
So I’m wondering if there is a guide or something to accomplish this. Has anyone experience with this?