You may find a lot of examples (in python) here : https://vtk.org/Wiki/VTK/Examples/Python
Also, vtkpython is especially useful for people that compile VTK with Python binding as it launch python so that it can find the vtk module (i.e setup the right PYTHON_PATH ).
In your case, vtk is already installed so your python interpreter will find it. Just import vtk and you should be able to follow the tutorial 