import vtk

source = vtk.vtkConeSource()

mapper = vtk.vtkDataSetMapper()
mapper.SetInput(source.GetOutput())

actor = vtk.vtkActor()
actor.SetMapper(mapper)

renderer = vtk.vtkRenderer()
renderer.AddActor(actor)

window = vtk.vtkRenderWindow()
window.AddRenderer(renderer)

interactor = vtk.vtkRenderWindowInteractor()
interactor.SetRenderWindow(window)
interactor.Initialize()
interactor.Start()